open-file report 86-90 - usgs · cally by poore (1972 and 1973), bard and tucker (1985) and davis...
TRANSCRIPT
SEISMIC SITE-RESPONSE EXPERIMENTS FOLLOWING
THE MARCH 3, 1985 CEWTRAL CHILE EARTHQUAKE
(TOPOGRAPHICAL AND GEOLOGICAL EFFECTS)
Edited by
M. Cel ebi-
U.S. Geological Survey Menlo Park, California
Open-File Report 86-90
This report is preliminary and has not been reviewedfor conformity with U.S. Geological Survey editorial
standards and stratigraphic nomenclature.
TABLE OF CONTENTS
Page No.
Acknowledgments ....................................................ii
IntroductionM. Celeb-l
Data Acquisition SystemsJ. G-ibbsf 0. Jensen, G. Maxwell, E. Sembera, J. Sena, J. VanSchaack, R.E. Wawick, R.D. Bor>cherdtf C. Dietel, and J. Fletcher .......................................
Field Experiments: Layout, Site Selection, Site Description, and Field Playback
M. Cel ebi, E. Sembera, C. Dietel, L.F. Baeza ....................17
Data Processing and Calculation of Spectral Ratios .................50J. Watson and C. Mueller*
Preliminary Analysis of Results, Conclusions and Reccranendations ...57M. Cel ebi
Appendix A ..........................................................A
Appendix B ..........................................................B
ACKNOWLEDGMENTS
A project of this type cannot be accomplished firstly without financial
support and secondly without cooperation of institutions, officals and re
search personnel. The editor of this report gratefully acknowledges the par
tial financial support of the Office of Foreign Disaster Assistance (OFDA) of
the Agency for International Development (AID). This support was administered
through a grant to Dr. S.T. Algermissen of the U.S. Geological Survey (USGS).
In addition to this partial support, Dr. Algermissen provided advice and con
sultation throughout the project. The mayor of the municipality of Vina del
Mar, Madame Eugenia Garrido gave full moral support and inspiration to the
project. Her staff, Luis Felipe Baeza, Hector Balbontin, Mario Mayo, and many
others very significantly contributed to the success of this project, and
their contributions are gratefully acknowledged.
Professors Rodolfo Saragoni and Edgar Kausel of the Civil Engineering
Department and Institute of Geophysics, respectively, of the University of
Chile, Santiago, and Professor Patricio Bonelli of the University of Santa
Maria in Valparaiso contributed to the execution of and discussions related to
the project.
Finally, Drs. Roger Borcherdt, William Joyner, and David Boore provided
many helpful suggestions and discussions before and after the mission.
Charles Mueller provided invaluable assistance in supervision of the data
processing. Drs. Gerald Brady and Paul Spudich carefully and extensively
reviewed the manuscript and offered valuable comments. Ray Eis and Lorraine
M. Hollis contributed with their artistic draft work. Barbara Gessner, as
always, patiently went through several drafts of typing effort. Gene Sembera
and Chris Dietel worked late hours and weekends during the field work and
Felipe Baeza was always there when we needed assistance. Without such advice
and support, a successful mission cannot be undertaken.
M. Celebi
Editor
11
INTRODUCTION
M. Celebi
The 3 March 1985 Central Chile Earthquake (Mg=7.8) occurred with signifi
cant foreshocks and was followed by significant aftershocks (March 15, M=6.3;
March 17, M=6.6; March 20, M=6.0, and April 8, M=7.2). The main population
centers affected by the main shock and the aftershocks are shown in Figures 1
and 2.
The main event and the aftershocks caused a variety of natural hazards
ranging from liquefaction and slope failure to failure of some unique engi
neered structures. These phenomena have been observed and preliminarily eval
uated. Initial efforts in assessment of these effects of the earthquake are
being compiled in comprehensive reports by the Earthquake Engineering Research
Institute (Wyllie, and others, 1985), the United States Geological Survey (Al-
germissen, editor, 1985) as well as the Chilean scientists (Saragoni and
others, 1985). The latter report contains extensive information on the accel
erogram records obtained during the main event .
In this report, some unique experiments performed almost five months af
ter the main event on the Central Chilean coast will be described. These ex
periments entail the study of specific site-response effects in the coastal
town of Vina del Mar, and Canal in Beagle, a subdivision of the same town. In
this report, the term site-response refers to variations in ground motions
caused by variations in geological structure and topography. The overall
geological formations of Vina del Mar, Canal Beagle, and Reneca, as well as
general topography and coordinates of the region are depicted in Figure 3.
The primary reasons for concentrating the efforts in this particular area
were:
o the extent of damage in some and yet lack of damage in other taller
structures (up to 24 stories) in Vina del Mar,
o the observations made during the previous trip (Celebi, 1985) ijmmedi-
ately after the main event that: a) at Canal Beagle there is a pos
sibility of geological and topographical (ridge) effects, and b) in
Vina del Mar, there is a possibility of amplification of ground motions
at alluvial and sand sites compared with firmer rock sites.
o the strong desire to correlate the damage distribution information com
piled by the Municipality of Vina del Mar with site-related amplifica
tion studies.
M = 6.6
o o
33°
3/17/85
72°
f(M = 7.8)
MAIN SHOCK 3/3/85
SANTIAGO
= 6.0
3/20/85
Figure 1. General epicentral locations of the 3 March 1985 (M = 7.8) central Chile Earthquake and its aftershocks and main affected centers.
32 C 58
32°59
33°00'
33°OI
33°02CANAL BEAGLE
7 I C 38' 7I°30'
Figure 2. General locations of central Chile coast where the experiments were performed.
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The possibility that topography could cause the frequency-dependent
amplification of seismic waves has been investigated empirically and theoreti
cally by Poore (1972 and 1973), Bard and Tucker (1985) and Davis and West
(1973). The current study presents a significant set of data reconfirming the
frequency dependent amplification of seismic motions at ridges. One addition
al credit to be given to the current study is the fact that the seismograph
array was located in a heavily populated region and a distinct damage pattern
related to the ridge effect was observed. The other studies (Bard and Tucker,
1985; Davis and West, 1983) were performed in unpopulated or rural areas.
Studies of the type presented herein are necessary and useful for micro-
zonation of local areas in seismic zones of the world. By quantifying ampli
fication due to local topography (hills and ridges), we can contribute to both
the local and overall understanding of this type of amplification. It may be
possible that similar topographical and geological conditions may exist in
close proximity to one another in other locales; therefore, results derived
from one location can be generalized to be applied at others subsequent to
additional studies. In Chile, for example, near Vina del Mar and beside Canal
Beagle there are several other subdivisions founded on ridges. One such sub
division visited by the author was Gomez Carreno off Avenue Ste. Ines. The
four-story structures in this subdivision were of concrete-block or brick
masonry construction. A considerable number of these structures suffered
extensive damage during the 3 March 1985 event.
Extensive review and experimentation of amplification of ground response
at alluvial and other soft soil sites has been made in the San Francisco Bay
Area (Gibbs and Borcherdt, 1974) and in the Los Angeles area (Rogers, and
others, 1984) using pre-scheduled events of nuclear test explosions at Nevada.
Certainly, the 19 September 1985 earthquake records in Mexico City (Mg=8.1)
show that during that strong motion event the peak accelerations recorded in
Mexico at a rock site and an alluvial site were 0.034 g and 0.17 g, respec
tively (Prince and others, 1985). Both of these records were obtained approx
imately 400 km from the epicenter.
The field work described herein was carried out between July 26 and
August 10, 1985. This report describes the specific steps implemented during
the field work and the extensive data set that has been obtained. Preliminary
results and conclusions derived from the processing of the data set are pre-
sented. Participants in this field work were M. Celebi, E. Sembera, and C.
Dietel as well as Mr. Luis Felipe Baeza of the Municipality of Vina del Mar.
Planning of the experiments and day-to-day decisions were made by the author.
The significant quantity of data obtained was played back and processed under
the supervision of C. Mueller.
EXPERIMENTS CONDUCTED AND SCOPE OF THIS REPORT
The original objective of the field experiments as described above were:
1. To study topographical/geological amplification of ground motions at
the Canal Beagle subdivision of Vina del Mar;
2. To study geological amplification effects in Vina del Mar.
The scope of this report covers these two experiments only. However, in addi
tion to the above experiments, two additional experiments because of conven
ience and scheduling practicality were conducted, although the objective of
the mission did not require them. These additional experiments were:
3. Ambient and free-vibration tests of selected structures at Canal
Beagle and Vina del Mar;
4. Earthquake response of a 22-story structure in Vina del Mar.
These additional experiments are not within the scope of this report and will
be documented separately.
Furthermore, all data and results presented in this report are derived
from velocity recordings of motions. Studies of the data from acceleration
recordings of motions are currently being carried out.
REFERENCES
Algermissen, S.T. (editor), 1985, Preliminary Report of Investigations of the
Central Chile Earthquake of March 3, 1985: U.S. Geological Survey Open-
File Report 85-542.
Bard, P.Y., and Tucker, B.E., 1985, Underground and ridge site effects: A
comparison of observation and theory (paper submitted for publication -
advance copy courtesy of B. Tucker).
Boore, D.M., 1972, A note on the effect of simple topography on seismic SH
waves: Bulletin, Seismological Society of America, 62, No. 1, pp. 275-
284.
Boore, D.M., 1983, The effect of simple topography on seismic waves: implica
tions for the accelerations recorded at Pacoima Dam, San Fernando Valley,
California, Bulletin, Seismological Society of America, 63, No. 5, pp.
1603-1609.
Borcherdt, R.D., Fletcher, J.B., Jensen, E.G., Maxwell, G.L., Cranswick, E.,
VanSchaak, J.R., Warrick, R.E., 1984. A General Earthquake Observation
System (GEOS), submitted to Bulletin, Seismological Society of America.
Celebi, M., 1985, Preliminary Field Trip Report on Chile Earthquake of March
3, 1985: Report to Earthquake Engineering Research Institute (April
1985).
Davis, L.L., and West, L.R., 1983, Observed effects of topography on ground
motion: Bulletin, Seismological Society of America, 63, No. 1, pp. 283-
298.
Gibbs, J.F., and Borcherdt, R.D., 1974, Effects of local geology on ground
motion in the San Francisco Bay region, California A continued study:
U.S. Geological Survey Open-File Report 74-222.
IAEE, 1972, Regulations for earthquake resistant design of buildings in Chile
from Earthquake Resistant Design Regulations - A World List): publication
of IAEE (International Association of Earthquake Engineering), Japan.
Prince, J., and others, 1985, Sismo del 19 de Septiembre Informs IPS-10 A, B,
C, Institute de Ingenieria, UNAM (University of Mexico).
Rogers, A.M., Borcherdt, R.D., Covington, P.A., and Perkins, D.M., 1984, A
comparative ground response study near Los Angeles using recordings of Ne
vada nuclear tests and the 1971 San Fernando earthquake: Bulletin,
Seismological Society of America, 74, No. 5, pp. 1925-1949.
Saragoni, R., Fresard, M., and Gonzalez, P., 1985, Analisis de los accelero-
gramas del terremoto del 3 de Marzo de 1985, Universidad de Chile, Publi-
cacion ses 14/1985 (199), Dec. 1985.
Wyllie, L., and others, 1985, Chile Report (to be published by Earthquake
Engineering Research Institute).
DATA ACQUISITION SYSTHflS
J. Gibbs, G. Jensen, G. Maxwell, E. Serribera, J. Sena,
J. VanSchaack, P.F. Warrick, P.D. Borcherdt, C. Dietel, and J. Ft etcher
The experiment conducted following the earthquake of March 3, 1985 on the
west coast of Chile utilized a set of eight portable General Earthquake
Observations Systems (GEOS). This chapter provides a general description of
the instrumentation followed by a sunmary of the particular configuration used
for experiments described herein. A detailed description is provided by
Borcherdt and others (1985).
GENERAL DESCRIPTION OF RECORDING SYSTHU
The portable digital data acquisition system used for the experiments was
developed by the U.S. Geological Survey for use in a wide variety of both ac
tive and passive experiments. The microcomputer based system was developed in
order that the system could be easily configured in the field to record sig
nals for a variety of different experiments, including studies of strong
motion, structural response, source mechanisms, wave propagation studies of
aftershock sequences, crustal structure, teleseismic earth structure, near-
surface seismic structure, earth tidal strains, free oscillations and a varie
ty of wave propagation studies such as those described in this report. Versa
tility in system application is achieved by isolation of the appropriate data
acquisition functions on hardware modules controlled by a central microcomput
er through a general computer bus. CMOS hardware components are utilized to
reduce quiescent power consumption to less than 2 watts for use of the system
as either a portable recorder in remote locations or in an observatory setting
with inexpensive backup power sources. The GEOS, together with two sets of
three-component sensors (force-balance accelerometers and velocity transduc
ers) and a ferrite WWB antenna is shown in Figure 1. The hardware modules
comprising the system are shown in Figure 2.
The signal conditioning module for the GEOS is configured with six input
channels, selectable under software control, to permit acquisition of seismic
signals ranging in amplitude from a few nanometers of seismic background noise
to 2g in acceleration for ground motions near large events. The analog-to-
digital conversion module is equipped with a 16 bit CMOS analog-to-digital
converter which affords 96 dB of linear dynamic range or signal resolution;
this, together with two sets of sensors, implies an effective system dynamic
range of about 180 dB. A data buffer with direct memory access capabilities
allows for maximum throughput rates of 1200 sps or 200 samples/second/channel.
With sampling rates selectable under software control as any integral quotient
of 1200, a broad and variable system bandwidth ranging from 10~5 Hz to 5xlO%z
is available for recording signals from a wide variety of sensor types.
Modern high density (1600-6400 bpi) compact tape cartridges offer large
data storage capacities (1.25 - 33 Mbyte) in ANSI standard format, to facili
tate data accessibility via minicomputer systems. Read capabilities of car
tridge tape recorders can be utilized to allow recording parameters and system
operational software to be changed automatically. Read capability can be
utilized to allow systems equipped with modems to transmit data via telecom
munications to a central data processing laboratory. Microcomputer control of
tiJTie standard provides capability to synchronize internal clock to internal
receivers (such as WWVB and satellite), external master clock, or conventional
digital clocks. Convenient system set-up and flexibility to modify system in
the field for a wide variety of applications is achieved using a 32 character
alphanumeric display under control of the microcomputer. English language
messages to operator executed in an interactive mode, reduce operator field
set-up errors. A complete record of recording system parameters is recorded on
each tape together with calibration signals for both the sensors and the
recorders. These records assure rapid and accurate interpretation of signals,
both in the field and in the laboratory.
Flexibility to modify the system to incorporate future improvements in
technology is achieved using a ringed software architecture and modular hard
ware components. Incorporation of new hardware modules is accomplished in a
straightforward manner by replacing appropriate module and corresponding seg
ments of controlling software. The flexibility afforded by microcomputer
technology to modify the system for specialized applications and to incorpor
ate changes in technology allows seismic signals as detectable by a wide
variety of sensors to be recorded over a broad band of frequencies with high
resolution.
The system response designed for strong-motion and aftershock applica
tions of the GBOS was intended to allow large amplitude near source signals of
9
1-10 Hz as detected by a forced-balanced accelerometer (FBA) to be recorded on
scale, while at the same time permitting much smaller amplitude high frequency
signals (50-100 Hz) as might be detected on FBA's or velocity transducers to
be recorded with high signal resolution. The design system response together
with that for two types of sensors frequently used for aftershock studies in
the near source region of large earthquakes is shown in Figure 3. With digi
tization rates and anti-aliasing filters, selectable under software control,
the design system response allows signals ranging from essentially DC to 500
Hz to be recorded at high resolution without aliasing. Gain settings, select
able under software control, allow two sets of three-component data, ranging
in amplitude over 180 dB, to be recorded simultaneously. Specifications for
the recording system are summarized in Table 1.
GENERAL DESCRIPTION OF DATA PLAYBACK SYSTEM
The read and write capabilities of the mass-storage module together with
the D/A conversion module permits the GEOS to be used as an analog as well as
digital (via RS-232) play back system in the field. Visual inspection of
digitally recorded data is useful for determining instrument performance,
evaluation of recording parameters, evaluation of environmental factors (e.g.,
local noise sources, etc.}. RS-232 capabilities of data playback unit and
ANSI-standard tape cartridges permit playback of digital time series on mini
computer system in the field or laboratory. Digital playback of data is gen
erally performed using an ANSI-standard serpentine tape reader as a peripheral
to minicomputer system in the laboratory. Deployment of minicomputer digital
playback systems in the field is generally most feasible for large scale high
data volume experiments.
RECORDING SYSTEM CONFIGURATION USED FOR CHILE EXPERIMENTS
For these experiments the recording system was configured as a six chan
nel system. Channels 1-3 were set up to record the vertical, north-south, and
east-west components of motion as detected by 3 component force-balanced ac-
celerometers (Kinemetric FRA-13). Channels 4-6 were set up to record the ver
tical , north-south, and east-west components of motion as detected by 3 com
ponents velocity transducers (Mark Product, Ir-22). Specifications for the
sensors are summarized in Table 2. Calibration procedures for sensors are
described by Eaton (1975).
10
Each recording system was operated in trigger mode to permit on-site de
tection of seismic events. Sampling rate for each channel was chosen at 200
sps, implying a Nyquist frequency of 100 Hz. High cut analog filters (seven
pole Butterworth, 42 dB/octave) with corner at 50 Hz were chosen to prevent
aliasing. Gain settings of 6 and 12 dp were chosen for the signals detected
by the acceleration sensors to permit any large amplitude near source signals
to be recorded on scale. Gain settings of 30 and 36 dB were used to record
smaller amplitude signals from more frequent small magnitude aftershocks to be
recorded on-scale with high resolution.
Accurate timing (± 5 msecs) for each of the recorders was obtained using
a portable master clock (model Mark I) synchronized with satellite time ob
tained from the Geophysical Institute of University of Chile in Santiago.
Sensor calibration (applied DC voltage, velocity transducer; applied ± 12
volts FBA) and recording system calibration (voltage impulse, 5 sec Dirac
comb) were recorded on each cartridge tape to permit evaluation of system
performance and accurate relative calibration of recorders and sensors with
changing environmental conditions.
Data playback in the field was accomplished using a GEOS system config
ured with a digital-to-analog conversion module and appropriate playback soft
ware. Analog playbacks of data using a Soltec strip chart with light sensi
tive film were used to visually inspect data in the field. Playback of
digital data to minicomputer was not undertaken in the field. A description
of the digital data played back from these experiments is described by Watson
and Mueller (this report).
REFERENCES
Aki, K., and Richards, P.G., 1980, Quantitative Seismology Iheory and. Methods,
vol. 1, W.H. Freeman and Co., San Francisco, California, 557 p.
Borcherdt, R.D., Fletcher, J.B., Jensen, E.G., Maxwell, G.L., VanSchaack,
J.R., Warrick, R.E., Cranswick, E., Johnston, M.J.S., and McClearn, R.,
1985, A general earthquake observation system: Bulletin, Seismological
Society of America, 75, no. 6.
Eaton, J.P., 1975, Harmonic magnification of the complete telemetered seismic
system, from seismometer to film viewer screen: U.S. Geological Survey
Open-File Report 75-99.
11
TABLE 1 - GBO^ Specifications
Microcomputer and Communications
Internal CPU: CMOS, 12 Bit. External CPU: optional. Data transfer:
Internal: Direct Memory AccessI/O Port: RS-232 compatible baud rate
programmable to standard rates.Telecommunications: UART, Modems optional.Analog playback via A/D.
Program Memory
Executable Memory: 8K 12 Bit word CMOS RAM. Program Storage: 16K 12 Bit word CMOS PROM. Alternate Program Storage: Programs may be stored
on magnetic tape for loading directly into programRAM.
Sensor Inputs and Signal Conditioning
Input Channels: 6 balanced differential Inputs, program selectable.
Preamplifier Dynamic Range: greater than 100 dB at 0dB gain, programmable in 6 dB steps 60 to 0 dB.
Filters: low pass Butterworth, 42 dB per octave;program selectable, 17 Hz, 33 Hz, 50 Hz, and100 Hz; high pass .1 Hz 6 dB per octave.
Calibration: Internal, automatic with or withoutsensors.
Transient Protection: ± 15 V
Analog to Digital Conversion
Resolution: 16 bits (1 part in 65,536).Stability and Linearity: ± 1 count-no missing codes
over full temperature range of -20°C to + 60°C. Conversion Rate (Total samples per second for all
active channels): 1200 samples per second maximum,.29 samples per second minimum; programmable as1,200/N where N is 1 through 4,096.
Pre-Event Data Memory
Size: 4,096 words, 16 bits per word.Pre-trigger memory: Five, 512 word blocks minimum
at 1,200 samples per second (2.14 seconds), six 512work blocks at 300 samples per second(10.24 seconds), program selectable.
Mass Data Storage/Retrieval
Cartridge: Read/Write 3M type, 1600 bpi.Tape capacity: 3,680 512 word blocks (1.88 million
samples) typical for 450 ft. tape, 26 minutes continuous record time at the maximum sample rate.
Tape Speed: 30 ips write or read.Slave Recorders: 2 optional, separate housing.
Time Control
External: WWVB Receiver: Automatic synchronization of
internal clock to WWVB under program command. Master Clock: Synchronization of internal clock
with external pulse and corresponding timecorrections derivable at selectable times underprogram command.
Manual: Time entered through keyboard andsynchronized manually.
Internal:Frequency: 3 MHz.Temperature Stability: ± 1 x 10" 6 ; - 20°C to+ 70° C.Aging Rate: less than 5 x 10 per year.
Operator Interface
Operation Environment: English language commandsunder software control.
Display: 32 character, alphanumeric display, 18segment, character height .15 in. LED with opticalfilters.
Keyboard: Mechanical switch with dust cover andwater seal, 20 button keyboard with numeric andfunction entry.
Status Checks: Time, battery voltage, no. of events,I of tape used, elapsed time since power on.
Debug: single and subroutine stepping.
Operating Modes
Self triggering: Near field: Selectable short term average (STA),long term average (LTA). ratio.
Teleseismic: Comparative ratios for two selectable frequency bands.
Pre-set time: record at selectable times andintervals.
Both: operate in both pre-set time and selftriggering modes.
Manual: record under keyboard control for start-stop functions.
Power Requirements
Voltage, current: + 24 VDC nominal ± 15*, 40 mA nominal in operating mode with display off, 300 mA nominal with display on, 600 mA with display or, and recording.
Internal batteries: ± 24 V, 5 AH Gates type, will operate about 3 days on internal batteries, connector provided for internal battery charging or external battery operation.
Physical and Environmental Requirements
Case Type: Waterproof aluminum case, 20 1/2" lore,9 7/8' wide 13 3/4" high.
Weight: 47 Ibs. with internal batteries. Operating Temperature Range: - 20°C to + 60°C, 15*
to 95% rel. humidity.
Patent pending.
12
TABLE 2 - Sensor Specifications
Velocity transducers:L22-3D (Mark Products)Natural freq.: 2 HzCoil Resistance: 5.5 K ftOutput: 0.5 v/cm/sDamping: 0.8 critical3 component pkg.: da., 18 cm; ht. 12 cm.
Forced Balanced Accelerometers: FBA-13 (Kinemetries) Range: ± 2 g full scale Output: ± 10 v full scale Natural Freq: 50 Hz 3 component pkg.; 14 x 14 x 8.5 cm
13
Figure 1. Side and front-panel view of the General Earthquake Observation System (GBOS), together with a WWVB ratio antenna and two sets of three-component sensors commonly used to provide more than 180 dB of linear dynamic range. System operation for routine applications requires only initiation of power. Full capability to reconfigure system in the field is facilitated by simple operator response to English-language prompts via keyboard.
14
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FIELD EXPERIMENT LAYOUT, SITE SELECTION, AND FIELD PLAYBACK
M. Celebi, E. Serribera, C. Dietel, L.F. Baeza
Deployment of the previously-described instruments at particular stations
required consideration of:
o Fulfillment of the objectives of the particular experiment;
o Accessibility to the particular site;
o Safety of the instruments;
o Optimizing the set of data which could be obtained with the limited
number of recording units available.
The two experiments constituting the subject matter of this report will be
described as the Canal Beagle and Vina experiments, and will be presented in
that order.
DEPLOYMENT OF DETRIMENTS FOR CANAL BEAGLE EXPERIMENT
The main objective of the Canal Beagle experiment was to investigate
possible a) geological, and b) topographical amplification. To achieve this, a
network of stations was established at this particular subdivision of Vina del
Mar. General location of these stations and topography can be seen in Figures
1 and 2. Specific descriptions of these stations are provided in Table 1.
Descriptive photos related to the Canal Beagle are referenced in Table 1.
REFERHCE STATIONS
These experiments were performed by establishing stations in accordance
with the described objectives. Throughout the whole duration of field work, a
reference station (VAL) was maintained at the University of Santa Maria in
Valparaiso. The location of this reference station is the same as one of the
strong motion stations of the Chilean strong-motion network. The reason why
this station was chosen as the reference station is two-fold:
o Its geological feature (amphibolite and granite gneisses) which makes
it the only rock site in close proximity to Vina del Mar.
o To provide data to correlate with the strong motion records of the main
event.
However, another reference station was established in downtown Vina del Mar at
the basement of the Municipality Building (an alluvial site). The main reason
for this choice was that it was impossible to occupy the same location as that
17
of the strong motion instrument site in Vina del Mar (also in the basement of
a building) because of a continuously running motor punp which could have con
taminated the low level motions at this site. However, the new station (MUN)
was only one block from the actual strong motion station.
18
TABLE 1Canal Beagle Experiment Stations
(General layout Seen In Figures 1 and 2)
Station Description Reference Figure
Site Stations:
CBA At ground floor (no basement) of Type B* 1,2, 3-5 structure founded on a clear cut at canyon between two ridges. The structure and its twin next to it were not damaged. Geologic formation: sedimentary. (Building
CBB At ground floor of a Type B* structure on top 1, 2, 5, 11 of ridge where there is extensive damage. Geologic formation: Sedimentary and decom posed granite. (Building #7)
CBC (Same as above, CBB.) (Building #12) 1,2, 6-8
CBD At ground floor of a Type A* (single story)structure. This part of Canal Beagle is on 1, 2, 9 the main body of the hill crowned by the ridges. (699 Ventisquero Street - at corner of Canal Kivke Street)
CBE At ground floor (no basement) of Type C* (all 1, 2, 13 5 stories) structure located on top of emerg ing portion of the ridge. (Building #4 - Edificio Thomson)
CBF At ground floor (no basement) of Type C* (all 1, 2, 10, 12, 13 5 stories) structure located at the top of the ridge. (Building #15 - Edificio Hyatt)
CBG On a concrete floor of a single story structure 1, 2, 14 located in the canyon between the two ridges. The structure is not part of Canal Beagle subdivision.
Reference Stations:
VAL On a concrete pedestal at the University of Santa 15, 16 Maria. Same location as the ^A station of the Chilean strong motion network. The site is amphib- olite and granite gneiss formation.
MUN At basement of 2 story reinforced concrete struc- 17 ture on 615 Arlegui Street in Vina del Mar. The building is on alluvial ground and one block from the £MA station of the Chilean strong motion network.
There are three types of structures in Canal Beagle. Type A structures are single and two-story buildings on top of the hill, whereas Type B structures are four-story buildings on one ridge and Type C structures are five-story buildings on another ridge. Two of the Type B structures are in a canyon at the entrance to the subdivision.
19
ro
o
(4
TY
PE
B
S
TO
RY
B
UIL
DIN
GS
)
2 T
YP
E
B
BU
ILD
ING
S
UN
DA
MA
GE
D
TY
PE
C
S
TO
RY
B
UIL
DIN
GS
)T
YP
E
A
C1
AN
D
2 S
TO
RY
B
UIL
DIN
GS
)
unid
ad
veci
nal
N
° 7
6
CA
NA
L B
EA
GL
E
Sec
tor
K-
Ach
up
alla
s
TY
PE
A
-
10
00
u
nit
s
TY
PE
B
-
20
0
un
its
TY
PE
C
-
320
un
its
Fig
ure
1
. G
ener
al
layout
of
Can
al
Bea
gle
subdiv
isio
n.
The
th
ree
rid
ges
cr
owni
ng
the
mai
n hil
ltop
(whe
re T
ype
A buil
din
gs
are
loca
ted)
are
indic
ated
. D
amag
ed f
our
sto
ry
(Typ
e B
) an
d fi
ve
story
(T
ype
C)
bu
ild
ing
s ar
e lo
cate
d o
n ri
dges
2
and
3,
resp
ecti
vely
.
33°02'
Figure 2. Detailed topography of Canal Beagle. The stations of the Canal Beagle site are indicated. Also a general scale and the latitudes and longitudes are shown.
21
Figure 3. Type B structure (no damage) at Canal Beagle where station CBA was sited. The structure is at the entrance to the Canal Beagle sub-
, division and is located in a canyon between two ridges.
Figure 4. Cut behind the two undamaged Type B buildings in the canyon at the entrance to Canal Beagle.
22
Figure 5. Type B structure (heavily damaged) on top of one of the ridges where station CBB was sited. A recent cut on the hillside displays the general status of the geological formation alluvial conglorner-
23
i Figure 6. Type B buildings on the slopes of one of the ridges at Canal Beagle. The first building is the site of station CBC. r
Figure 7. Site of station CBC. Note the extensive damage to the concrete walls and infill brick walls.
24
- -I
Figure 8. Close-up of damage to the Type B buildings (site of station CBC).
25
Fieure Figure Site of station CBD - Type A building on top of the hill crowned by There were ^ dajnages to this buiiding or other Type A
buildings.
buildings (5 stories) all extensively damaged.
26
Figure 11. Type B buildings on top of the ridge, is seen here.
General view of the ridges
Figure 12. Type C buildng on top of the ridge. Station CBF was sited on the ground floor of the building. A general view of the ridge is also seen in the figure.
27
Figure 13
. Pa
nora
mic
view
of
Type C
bui
ldin
gs (a
ll fi
ve st
orie
s) on t
op of one of t
he r
idges
at
Canal
Beagle.
All
buil
ding
s are
severely d
amaged.
Note t
he s
teep
slopes.
Figure 14. Locations of station CBG - in a canyon between two ridges. On top of the ridge, Type C buildings are seen.
29
71° 36.5
d« los L«ch*ro» ^
-33°2.6'
Figure 15. Nation of reference station VAL-a granite and amphiobolite gneiss site (Figure adopted frcm Algermissen, 1985).
30
71°35' 71°34'
33C01'30" -
33°02'00" -,
(UNIV. OF SANTAO VAL
(ROCK SITE)
FigLire 16. Location of reference station VAL.
31
Figure 17. Reference station VAL located at a vault within the University of Santa Maria (Valparaiso) Campus. This is the same location as the SMA station of the Chilean Strong Motion Accelerograph Network.
I
Figure 18. Reference station MUN at thein Vina del Mar. The building is
3:2
basement of the Municipality Building bund on alluvial deposits.
The selection of specific sites for site response studies in Vina del Mar
was greatly facilitated by the use of preliminary damage concentration maps
compiled by the Municipality (Balbontin and others, 1985). Based on these
maps, various stations were established on sandy, alluvial, and granitic
sites. The reference station, VAL, established at the beginning of the previ
ous experiment at Canal Beagle was kept as such (Figures 15-17). The loca
tions of the stations in Vina del Mar and Reneca are depicted in Figures 19-
21. For security reasons and protection against weather conditions, the
instruments were located at basements or ground floors of structures.
The sand sites consisted of the ocean front areas where Edificio Acapulco
and Edificio H'Angoroa (the two taller strutures that were severely damaged
during the main event) (Wyllie, and others, 1985 and Celebi, 1985) as well as
Edificio de Miramar (one of the undamaged four 22 story reinforced concrete
structures with triangular shape in plan) are located. Stations EAC, RAN, and
TRA were sited in the basements of Edificios Acapulco, H'Angoroa, and de
Miramar, respectively. In addition, another site was occupied near the site
of Edificio El Faro (the eight-story building in Reneca that tilted and was
later dynamited).A I
The alluvial sites were the Municipality Building (MUN), Edificio Liber-
tidad de Chile (ELC), Edificio Emparte (FMP) and the Church Building (CHU).
The firmer decomposed granite and granite sites were one of the four towers of
the Quinto Claude Complex (22 stories, block 2) (OCL), the Sietes Hermanas
(HER) and Santa Ynez (YNE) (2075 at 24 Norte).
More detailed particulars of all stations in the Vina experiment are
summarized in Table 2 along with reference figures.
STATION SCHEDULING, INSTRUMENT POSITIONING AND ADJUSTMENTS AND FIELD PLAYBACK
In general, instruments at established stations were relocated to other
locations (new stations) only after making sure that a sufficient number of
events were recorded at several of the stations. Thus, comparisons of motions
(or transfer functions) at one station with respect to another could be made.
However, in a couple of cases (e.g., station CBG at Canal Beagle), the instru
ments were relocated even though no events were recorded to provide qualita-
33
,r
tive comparison. In certain situations the instruments were relocated even
though no events were recorded and results from another similar station (sta
tion CBA) could be used. A general schedule of the location of GEOS recording
systems is shown in Table 3. General views of the instruments used (GEOS
recorder, batteries, and transducers) are seen in Figure 29.
The velocity and acceleration sensors were always leveled. The horizon
tal components were aligned to true north direction using a compass.
Instrument gains were set generally at 36 dB for velocity sensors with
the expectation of recording aftershocks in the magnitude 3 to 5 range. Gains
for acceleration sensors were set generally at 12 dB for possible aftershocks
greater than magnitude 5. These gains proved to be suitable after examination
of the initial aftershock data on the GEOS analog playback oscillograph util
ized in conjunction with a visicorder. In many instances, the events played
back on the visicorder showed the amplification expected between the accelero
grams obtained from different stations.>' '
V ' *
REFERENCES
Balbontin, H., and others, 1985, Danos Viviendas Sismo 1985, Direccion de
Planificacion y Asesoria Urbana, Municipalidad Vina del Mar.
Celebi, M., 1985, Preliminary field trip report on Chile Earthquake of March
3, 1985: Report to Earthquake Engineering Research Institute (April
1985).
Wyllie, L., and others, 1985, Chile Report (to be published by Earthquake
Engineering Research Institute).
34
TABLE 2VINA EXPERIMENT STATIONS
(General Layout Seen in Figures 19 and 20)
Station Description Reference Figure
Sand Site Stations on Level Ground: *T
_EAC At the lower level of the two-level basement 19, 21, 22 of the 15 story reinforced concrete shear wall building whose plan is "fishbone shaped" (Edificio Acapulco). The structure was severely damaged during the main event. The building sits on the sand beach of Avenue San Martin.
HAN At the lower level of the two-level basement 19, 21, 23 of the 15 story reinforced concrete shear wall structure (Edificio H'Angoroa), severely damaged during the main event. The building is next to Edificio Acapulco on the sand beach of Avenue San Martin.
TRA At the lower level of the two-level basement 19, 24 (garage) of the 21 story (not including base ments) reinforced concrete structure (Edificio de Miramar) which was not structurally damaged
; during the main event. The building is one of 4 similar structures alongside Avenue San Martin.
- (Four more stations were located in this building as part of other experiments to be reported separ ately.)
RM This site was specifically chosen to study site 20, 25 response on the sandy hills of Reneca'. The specific station chosen on the ground floor of a single story building was in the immediate vicin ity of Edificio El Faro which was severely damaged and tilted during the main event and as a conse quence was later dynamited.
Alluvial Stations on Level Ground:
MUN Same as previous experiment (See Table 1). 18, 19
ELC Edificio Libertido Centro. (at 570 Libertido 19, 26 Street), 14 stories including 1 floor of basement. A reinforced concrete frame structure, suffering very minor damage during the main event. The location is on alluvial ground. -1
35
TABLE 2 (Continued) VINA EXPERIMENT STATION
Station Description Reference Figure
BMP Edificio Bnparte' on 15 Norte Street. 19, 27Block C4 of 19 similar social housing
"' apartments. 5 story reinforced concrete framed building. The building is on level alluvial ground. Four of the 19 buildings were damaged.
CHU Espiritu Santo Church at the intersection of 19, 28 Llay Llay and Caucha Streets. Masonry struc ture on alluvial site. Severely damaged. Buildings around this church including a
... children's hospital (Hospital de Ninos) also; damaged.
Rock Sites on Hills:
QCL Block 2 of the 22 story (plus two story 19, 29 basement) Quinta Claude structure (reinforced concrete frame with core shear wall) . These structures were built on granitic rock and suffered negligible damage.
HH&, In the basement of one of the Sietes Hermanas 19, 30 Buildings (4-10 stories) which suffered minor structural damage during the main event. Most of the external stairways giving access to the structures from the exterior or access between buildings were damaged. The site is decomposedgranite on a hill.
%YNE One of two 5 story reinforced concrete framed 19, 31
structures (with brick infill walls) located on hill at 24 Norte Street off Avenue Santa Ynes. Minor damage during the main event. Instrument located in basement. The site is granite or decomposed granite.
Reference Rock Site: '
VAL Same as Table 1. . - \ 15-17
GEOS 2
5
TABLE
3RECORDER DEPLOYMENT SCHEDULE AT
STATIONS
Recording
Unit
GEOS
19
GEOS 17
GEOS
23
GEOS 3
GEOS 13
GEOS 15
GEOS 12
7/27/85
Juli
an:
208
(VAL
) 14
:03 GMT
(MUN
) 14
:40 GM
T
(CBA
) 17
:22
GMT
(Date
and
Stations- In
stal
lati
on T
imes
(GMT)
of s
ome
stat
ions a
re i
ndic
ated
)
7/28/85
7/29
/85
7/30
/85
7/31
/85
8/1/85
8/2/85
8/3/85
8/4/85
8/5/85
209
210
211
212
213
214
215
216
217
(CBB
) 18:30 GMT
(CBC
) 18:48
(CBD
) 19
:14
(CBE
) 19:43
(this
stat
ion
was
operated c
onti
nuou
sly)
(HAN
) (R
EN)
(TRD
) 20:20:03
(EMP
) (T
RB)
15:4
8 GMT
(HER
) (MUN)
16:50 GM
T 15
:56
(ELC)
(TRC
) GM
T 21
:19
(QCL
) (CHU)
T0GM
T (2
1:00
GMT)
(EAC
) (T
RE)
GMT
21:3
9
8/6/85
8/7/85
8/8/85
218
219
220
) » Sa
ntia
go
)* S
antiago
)*
) » Sa
ntia
go
Cartegena
)+
)* S
antiago
(CBF
)(CBG)
(YNE
) 17
:30 GM
T 20
:11 GMT
(TRA
))*
San
tiag
o
7V 32°59'00'
71°33' 71°32f
32°59'30* -
33001'00*
32°01'30'
EDIFICIO DE *-* / MIRAMAR*
TRA/A . TT£..(SAND);, ,. o&%«
* x.^ *-~i**/^rwr> >''"--
-EDIFICIO -/ ACAPULCO
EAC *
(ALLUVIAL SITE)
^
(GRANITE DECOMPOSED QcLm&
(GRANITE ANDDECOMPOSE
Figure 19. Location of stations in Vina del Mar,
38
71°33 f 71°32 f
32°58'00"
32°58'30 -
32°59'00*
Figure 20. Location of station REN in Reneca. well as a general scale is shown.
Latitudes and longitudes, as
39
EDIFICIO HANGAROA
( 15 ttoriet
EDIFICIO ACAPULCO
PLAZA DEL MAR
~i
9th NORTH
zp cc
z(0
LUD Z L1J
EDIFICIO MARINA REAL
StTTNORTH
Figure 21. Locations of Edificio Acapulco and Edificio H'Angaroa severely damaged modern engineered buildings, on Avenue San Martin.
40
PLAN VIEWTiaur* MS MMtf* M«if 3*. J." *.* *" f f '
DAMAGE PATTERN
EDIFICIO ACAPULCO
Figure 22. Plan view, qualitative damage pattern and view of the extensive damage to the exterior shear wall of Edificio Acapulco station EAC. (Plan view of the building is provided by Prof. P. Bonelli).
41
EDIFICIO HANGAROA
Figure 23. Plan view, qualitative damage pattern and general view of Bdificio H'Angoroa station HAN. The slabs and shear walls cracked exten sively from top to ground floor. (Plan view of the building pro vided by Prof. P. Bonelli).
42
EDIFICIO DE MIRAMAR
Figure 24. General and plan views of Bdificto de Miramar, one of the several twenty-two story buildings that survived the main event without damage.
43
EDIFICIO EL FARO
Figure 25. General view of Edificio El Faro (on sand dune hills of Reneca)after the main event. The building was later dynamited. Station REN was sited on ground floor of a single story building immediately adjacent to Edificio El Faro.
44
Figure 26. General view of Bdificio Libertidad de Qiile (Station EL£),
i Figure 27. Edifice Fmparte (Station FJUP) one of nine similar buildings that I suffered moderate damage during the main event.
I
45
05
Fig
ure
28.
Chu
rch
buil
ding
on
th
e le
ft
(sta
tion
CH
U),
Hos
pita
l de
N
inos
ne
xt
to it
(o
n th
e ri
ght
top)
an
d si
ng
le
sto
ry m
ason
ry st
ruct
ure
s in
th
e sa
me
vic
init
y
(on
the
right
bott
om).
A
ll
thes
e st
ruct
ure
s w
ere
mod
erat
ely
dam
aged
dur
ing
the
mai
n ev
ent.
Figure 29. Two of the four twenty-two storybuildings with shear walls (statior of block 2 at the right). These granite hills, suffered no damage.
reinforced concrete Quinte Claude QCL was sited at the basenent
buildings, situated on decomposed
Figure 30. Two of the several buildings situate< sited in the event, the sky-'
basenentwalkways
reinforced concrete shear wall Sietes Hermanos on decomposed granite hills. Station HER was
of one of these buildings. During the main and stairs suffered extensively.
Figure 31. One of the two buildings' on decomposed granite hills of Avenue Ste. Ynez. Station YNE was located in the basement of this building (minor dariage during main event).
L
Figure 32. General view of GEOS recorder, batteries and sensors at a particu lar site and check being performed to determine whether events have been recorded.
49
DATA PROCESSING AND CALCULATION OF SPECTRAL RATIOS
byJohn C. Watson and Charles S. Mueller
This section constitutes a description of the procedures used for pro
cessing the extensive set of digital strong motion recordings obtained from
aftershocks following the May 3, 1985 Chile earthquake (Ms=7.8). Two
overlapping studies conducted during late July and early August of 1985
resulted in 40 DC300XL data cartridges from 18 stations recorded on wide
dynamic range GEOS instruments (Borcherdt and others, 1984). Each GEOS
operated in trigger mode, simultaneously recording six channels of ground
motion at 200 samples-per-second-per-channel; namely, three-components of
ground acceleration (Kinemetrics FBA-13 force balance accelerometer) and three
components of velocity (Mark Products L-22 geophone). The FBA's were recorded
at relatively low gain in order to obtain undipped recordings of large ground
motions while the geophones were recorded at higher gain. The combination
allowed high signal-to-noise recordings over a range of ground motion ampli
tude to be obtained. No clipped records were observed. Each GEOS clock was
set once at installation using a portable master clock; therafter clock
corrections were obtained approximately once every twenty-four hours when the
sites were visited for tape changes. Other GEOS parameters are described
elsewhere in this report.
Data cartridges were returned to Menlo Park for processing. During play
back, the computer directory structure (and the subsequent magtape archival
structure) was organized by increasing trigger-time. Data cartridges were
played-back with a Tandberg TDC3000 digital cartridge recorder onto a PDPll/70
minicomputer. The software interface is the FORTRAN program RDGEOS written by
Gary Maxwell of the USGS, Menlo Park. The data were demultiplexed and stored,
one trace per file, in blocked binary format. Each file name consists of 13
characters following the USGS Branch of Engineering Seismology and Geology
filename convention:
character 1-3 Julian day
character 4-5 hour
character 6-7 minute
character 8 seconds (A = 0-3, B = 3-6, C = 6-9,..., T = 57-60)
character 9 motion (1-3 = acceleration, 4-6 = velocity)
character 10 period (.)
character 11-13 station-instrument identifier.
50
Each file consists of two header blocks which contain relevent field and
playback parameters followed by data blocks.
Figures 1 and 2 are plots of all trigger times versus Julian day for the
Canal Beagle and Vina del Mar studies, respectively. With the files on disk
two archival tapes were made and all seismograms were plotted for preliminary
seismic interpretation. The data set was then winnowed so that single-station
triggers were excluded. Considering the overall network configuration, a
twenty second sliding window was chosen in order to select common-event trig
gers. The winnowed data set was then copied to the VAX-11/750 minicomputer
for more detailed seismic analysis. Tables 1 and 2 list aftershocks recorded
at two or more stations for the Canal Beagle and Vina del Mar studies, respec
tively. The three-letter station-instrument codes appear in the first row and
the origin times of events appear in the first column. If a station recorded
an event, character 8 of the filename (the trigger-time seconds character, a
useful file identifier) appears in the table. Of 355 triggers from nine sta
tions during the Canal Beagle study (including stations VAL and MUN, which are
ccranon to both studies), 29 were earthquakes recorded at two or more stations,
11 at four or more stations, and six events at six or more stations. Of 491
triggers recorded from 11 stations during the Vina del Mar study (including
stations VAL and MUN) 27 were earthquakes recorded at two or more stations,
seven at four or more stations, and two at six or more stations.
Plots of vertical and horizontal (N-S and E-W) components of velocity for
all events recorded at two or more stations were made. Velocity records gen
erally provide better results; therefore, only velocity seismograms are
plotted herein (acceleration time histories are currently being studied and
processed by the editor of this report). These plots of velocity seismograms
and related spectra are provided in Appendices A and B for the Canal Beagle
and Vina experiments, respectively. Indexing of events, and descriptions of
the plots are also provided in these Appendices. In the plots, a positive am
plitude for the vertical ground motion corresponds to upward motion, and for
the horizontal ground motions, positive amplitudes correspond to northward and
eastward motions for the N-S (H=0) and E-W (H=90) directions, respectively.
In order to characterize the site-dependence of ground motion in the
Canal Beagle and Vina experiments, spectra and spectral ratios were calculated
from whole-record waveforms. For recordings made at closely-spaced sites
51
(relative to the focal distance), spectral ratios tend to deemphasize common
source and whole-path wave-propagation effects, and emphasize local wave-
propagation differences. The experiments described in this report were so
designed.
To calculate amplitude spectra, waveforms were windowed (to insure equal-
length numerator and denominator and not to isolate phases), DC corrected, ta
pered (10% cosine front and back), padded with zeros to an integral power-of-2
number of points, and fast-Fourier transformed. Spectra were not corrected
for instrument or anti-alias-filter response; these effects are assumed to be
common to all instruments to the level of detail considered here and, there
fore, to cancel in spectral ratios. Spectra were smoothed with a running
triangle (width ~ 0.5 Hz) prior to obtaining ratios. All spectra are plotted
up to 30 Hz and signal-to-noise is generally adequate in this band for the
best recorded events (Figure 3).
Fourier amplitude spectra and spectral ratios accompanied by windowed
time series are provided in Appendices A and B for the Canal Beagle and Vina
experiments, respectively.
REFERENCE
Borcherdt, R.D., Fletcher, J.B., Jensen, E.G., Maxwell, G.L., Cranswick, E.,
VanSchaack, J.R., Warrick, R.E., 1984. A General Earthquake Observation
System (GEOS), submitted to Bulletin, Seismological Society of America.
TABLE 1. Events recorded on two or more stations (Canal Beagle Experiment)
\2090350A ^0S I7fl 11* - 2091723G 20918491 2091915C
2091921F2092020F2100011G
21C0710G2100711H2101029N2101044E210144612101536A21016C9N2101816B21C1919H2101926C21C2C23L2110059F2110337D211C6C2A2110933S2111026B2111208fc211122K;211U30K
*AL
FG~S
H
IBKBH0LPD
6
F0
HUN CBA _ _A__
G 1J C
FF
-- -" £GI
hB
P
6 6F
H H
CEEA
15G1h £0
Kfeh
LFC
6- gR
£
I CBC
1
sGIN
_ --f'
ANEhF
PIAg-RU
CBD CEE
H
K
K-- - -5, G
______
NBH
P
5 5
R R
: CBF CBG
HSG1------ - - - - - ------
JAN - BKP
~jpDAS_ -R
M
TABLE 2. Events recorded on two or more stations (Vina Experiment)
WHERE OUTPUT,
2091701R 2092020F
2111208P 2121822L 2130430P
2131743* 2140256D 2141457H2141800J 2150204N 2150337K 2160018K
2160125Q 2160336H 21604470
2160657J 2161006F 2161857F/I? jvu/r 2191110K 22006060 2220853E
TBACK VAL
F sR L P
M D K
N K
IG
0
L
F
K 0E
- 5.0, TAHEAD= 20.0. 2 RECORDS NUN QCL ELC EAC HAN EMP HER D F- -5 - H
L P
SU fcf f*(
D
S 0 ' N K K K
M0
H 0
J J J G
G G
LP E
TO DECLARE AN EVENT. YNE REN CHU TP.A
F
M
JN N K
" ---H " ' ' ' '- ' ' 0
tt G 0
J J F F
G G
L
53
cnN
ni
BERG
LE 7
/25/85
208
CB
G-
CB
F-
CB
EH
UJ z:
CB
D-
co
2 i i i o I I I
cr CO
CB
C-
CB
B-
CB
fl-
MU
N-
VflL
- 208
209
210
211
(6 COMPONENT GE
OS)
212
213
-»+
4+-H
--H
W-
-HW
-
+
-H-
-H-+
-H4-
-H
- +
+
4+
+
+
+
-H-
++
-H--
W-
HH
+ +
+
-H-H
- +
i l
I n
t _
_ II
III M
l T
IT
Illll II
I I I
I II
II I
++
+ +
*
+
-*+
+
+ +
-H
-H-+
-H-
+H-
+
HH
fr
209
210
211
JULI
RN onr
212
213
Figu
re 1
. Re
cord
ing
vs.
time p
lot
(Can
al Be
agle
Exp
erim
ent).
1, (Each "+"
repr
esen
ts a
trig
ger)
en
en
VIN
fl
DE
L
Mfl
R
7/2
6/8
5
(6
CO
MPO
NE
NT
G
EO
S)
208
209
210
211
212
213
21M
21
5 21
6 21
7 21
8 21
9 22
0 22
1 22
2 22
3 22
4
TR
R-
CH
U-
RE
N-
YN
E-
ID
OC
I -
CDH
ER
-
" E
MP
H
o I 4
EflC
HCE h- CD
ELC
-
OC
L-
MU
N-
VflL
-
-H-
-4W
- -tt
--H
-
+ +
-t-
-H
H-H
- +
_M_
_i_
ii i
n
ii
« j i
JX
- ii
i
i 11
1 it
t
"IT
T "
II I
II
II1
'1'1
't"
TT
T
t II I
tt'II
I
Jl,
I
IIJ^
I
L
1 t
I M
ill,
_1
.IJ_
J
ll
I II
iT
T
1IT
T
T T
II ! tr
"
IT H
i'1
11
+
+
m
ilil
Mit
a i
m*
ii
i T
tiT
nO
Bn
r
1 TO
"
Tr T
HHH
+
-f-
+ 4
H-+
HH
+ -f
HB
-f-
+ H
Hf
-f
HH
IH-f
-«
-f-
HW
H+
III
Hill
-f- -f
-f
-H--
H-H
H+
+-
HH
«
+
+
i I
i i
i I
i i
i I
i i
i I
i i
i
tt- HU
H II
I -t
-HH
flh
-tt-H
- -m
-f
+-H
-4+
-H
++
I i
i j
I _j
i_i
I
i_i
I i
. i
I i
. i
208
209
210
211
212
213
21M
215
216
217
218
JULIflN DRY
219
220
221
222
223
224
Figu
re 2
. Re
cord
ing
vs.
time
plo
t (Vina
Experiment)] (Ea
ch "+
" represents a
trigger)
2111208R
ii.C
BR
V
OP
S-R
OC
2111
208R
5.CB
R H«0
OPS-ROC
2111208R6.CBfl H-90
OPS-ROC
0.04 r
0.0
2
-0.0
2
-0.0
15
10
SE
CS
15
0.0
4 r
0.0
2
-
-0.0
2
-
-0.0
45
10
SE
CS
0.01
0.00
1
10'
10'
P-W
AVE
........'... M
A A
A.'.
0.01
0.00
1
10'
10'
10
20
30
0 H
Z10
20
0.01
0.00
1
10"
30
10'
HZ
10
20
H
Z30
Figure
3. Spectral
signal-noise comparison
for
a ty
pica
l th
ree
comp
onen
t re
cord
ing
(eve
nt 2
1120
8 at
st
atio
n CBA).
PRELIMINARY ANALYSES OF RESULTS, OONCLOSIONS AND REOCMMHTOATIONS
M. Cei ebi
The seismograms, Fourier amplitude spectra, and spectral ratios presented
in Appendices A and B constitute a significant percentage of the processed
data from the Canal Beagle and Vina experiments, respectively. At the time of
preparation of this report, the epicentral distances, magnitudes, and other
relevant information of events presented herein were not yet available from
the Geophysical Institute of the University of Chile in Santiago. However,
even without this information and because the stations established were close
to one another (as compared to epicentral distances), for each one of the
events, the velocity seismograms (presented in Appendices A and B) obtained
from different stations visually depict the degree of overall amplification of
motions at one site relative to another.
Although this data set is currently being analyzed for other purposes, in
this section the spectral ratios obtained from velocity seismograms are exam
ined more closely with respect to amplification at specific sites. By this
method, it is intended to distinguish between the topographical and geological
amplification at different sites.
In order to draw conclusions related to practical engineering and to cor
relate the results with the damage distribution at Canal Beagle and Vina del
Mar, selected spectral ratios corresponding to pairs of stations presented in
Appendices A and B have been replotted for frequencies 0-10 Hz and with a
standard format. The main reason why spectral ratios are replotted for 0-10
Hz is to show the amplification within a frequency range (0-10 Hz) that is
applicable for most structures. In obtaining the spectral ratios, standard
25-second windows were applied to velocity seismograms if the records were 25
seconds or longer; otherwise, the length of the shorter seismogram was used
for both records of the pair for which the spectral ratio is calculated, if
spectral ratios between pairs of stations are available, for more than one
event, the spectral ratios are superimposed to study the repeatability of the
relative response at that pair of sites. All spectral ratio plots are
smoothed with a triangular weighting function of 0.25 Hz width.
TOPOGRAPHICAL AMPLIFICATION AT CANAL BEAGLE
In Figures 1-3 the spectral ratios of three different events for stations
CBA/VAL are presented for vertical and horizontal (N-S and E-W) components,
57
respectively. These ratios are representative of only geological effects
(ignoring distances and source parameters of the three events) and therefore
represent the geological transfer function Tr
T ~
where AQ-^(CO) is the Fourier amplitude spectrum at site i.
The transfer function justifications have been discussed in detail by
Rogers and others (1984).
To provide a better comparison, the spectral ratios for stations CBA/VAL
of all three events are superimposed in Figure 4 for the vertical and horizon
tal (N-S and E-W) , respectively. These summary figures display distinctive
resonance at approximately 6 to 7 Hz and amplification ratios ranging from l
to a minimum of 2 for frequencies 4 to 7 Hz in the N-S and E-W directions and
for frequencies 6-8 in the vertical direction.
The spectral ratios of the same three events (as in Figures 1-4) and
their superimposed comparative ratios for stations CBB/CBA are presented in
Figures 5 to 7 for the vertical and horizontal (N-S and E-W) components, res
pectively. The same is repeated for stations CBC/CBA in Figures 8-10. Simi
larly, spectral ratios from data available of only two events and their super
imposed comparative ratios for stations CBE/CBA are presented in Figures 11 to
13 for vertical and horizontal (N-S and E-W) components, respectively. The
same is repeated for stations CBF/CBA in Figures 14-16. In the case of sta
tion CBD sited on the top of the hill from which the ridges appear, the spec
tral ratios show considerable variation. During the main event of March 3,
1985, there was no damage inflicted on the single and two-story buildings on
this hill, nor was there damage in the canyon where reference station CBA was
established. The spectral ratios from the data available of only two events
and their superimposed comparative ratios for stations CBD/CBA are presented
in Figures 17-19 for the vertical and horizontal (N-S and E-W) components,
respectively. For these two events, the spectral ratios do not indicate the
repeatability of frequency dependent amplifications of motions observed in
spectral ratios of other pairs of stations. Although some resonance (for both
events) is apparent around 8 Hz, until further observations can be made at the
pair of stations CBD and CBA, no credible amplification of motions at station
58
CBD as compared to motions at CBA can be claimed for frequencies between 0-10
Hz.
The significant amplification ratios are consistent and repeatable for
multiple events, particularly for N-S and E-W directions of stations CBB, CBC,
and CBF compared with station CBA. Therefore, it is concluded that with these
spectral ratios the ridge effects are separated as topographical transfer
function Tt :
T _ y ;>where A^ is the Fourier amplitude spectrun at site i.
Noting that stations CBB and CBC are on one ridge and station CBF is on an
other, the spectral ratios displayed in Figures 6, 7, 9, 10, 15, and 16 for N-
S and E-W directions clearly indicate for different events resonance at fre
quencies that are in the range of the structures built on the ridges. On the
other hand, the spectral ratio corresponding to station CBE (being at the
junction of the ridge and the hill) does not show similarities to the other
stations on the ridges.
GEOLOGICAL AMPLIFICATION AT VINA DEL MAR
Only selected spectral ratios are presented for most of the stations in
Vina. Data from some of the stations are not presented since the particular
events recorded at these stations do not provide a basis for comparison. In
obtaining the spectral ratios, the distance and topographical effects are
ignored as most of these stations are in close proximity to one another.
Therefore, only geological effects are assuned to be exhibited.
SPECTRAL RATIOS AT SAND SITES
Spectral ratio plots for two separate events each as well as superimposed
spectral ratios for stations EAC/VAL are presented in Figures 20-22 for the
vertical and horizontal (N-S and E-W) components, respectively. The same is
repeated for stations EAC/VAL (Figures 23-25) and for stations REN/VAL (Fig
ures 26-28). Stations EAC (at Edificio Acapulco a severely damaged build-
59
ing), TRA (undamaged building, triangular shaped in plan, in close proximity
to Edificio Acapulco) and REN (on the hills of Reneca' and near Edificio El
Faro the structure which tilted during the main event and was dynamited
shortly after) were established to measure the amplification at the coastal
zone. These figures display the repeated and significant degree of amplifica
tion at frequencies in the range of those structures (8-15 stories) where
these stations were sited.
SPBCTOAL RATIOS AT ALLUVIAL SITES
The only station on an alluvial site for which there is available data
for several events is station MUN. The data from stations (e.g., EMP and ELC)
on other alluvial sites exhibit very high spectral ratios as compared to sta
tion VAL (rock site) because of the low amplitude and high frequency noise
mixed with the data from station VAL for the corresponding event. Therefore
the plots for the spectral ratios for stations MUN/VAL only corresponding to
two different events and their superimposed plots are presented in Figures 29-
31 for vertical and horizontal (N-S and E-W) components, respectively.
SPECTRAL RATIOS AT ROCK SITES
Spectral ratios from one event only for each one of the comparative sta
tions QCL/VAL, HER/VAL and YNE/VAL, are provided in Figures 32-34, respective
ly. Each figure depicts the spectral ratios of motions in vertical and hori
zontal (N-S and E-W) components for the stations indicated.
CONCLUSIONS
The data set presented herein allow the following conclusions to be made:
o The data from Canal Beagle comprise essentially the first set of data
from a dense array deployed at a heavily populated region with ridges
and provides an opportunity to distinguish topographical effects from
others, and to correlate these effects with damage patterns,
o For several events, the seismograms obtained from different stations
and plotted with the same scale presented in Appendices A and B clear
ly depict the degree of overall amplification of motions at various
stations as compared to the rock station or at any one station rela
tive to any other station.
60
o It has been shown by use of the spectral ratios that there is signifi
cant geological and topographical amplification at the ridges of Canal
Beagle as compared with the rock site (VAL).
o It has been shown that there is significant topographical amplifica
tion at the ridges of Canal Beagle compared with the canyons of Canal
Beagle. The frequency dependent topographical amplification ratios of
motions at the ridges range from 1 to a minimum of 2 or 3 for most
frequencies in the ranges of structures built on them.
o The spectral ratios for different sites at Viria del Mar depict clearly
the frequency-dependent geological amplification at sand, alluvial,
and firmer sites (QCL, HER, YNE) as compared to the reference rock
station (VAL).
REOCMMETOATIONS FOR FUTURE 10RK
o Engineering application of these results should be derived and incor
porated into local microzonation maps.
o Limited data has been obtained from alluvial sites in Vina del Mar.
In the future, additional data should be obtained at alluvial sites in
Vina del Mar.
o The work should be extended to Valparaiso where there is similar geo
logical detail and damage correlation.
o The work presented herein should be further substantiated by theoreti
cal studies involving wave propagation.
o In order to pursue the above, reliable soil layer stratification
information is necessary. This necessitates soil logs.
o Further work to quantify statistically engineering amplification fac
tors is warranted. Mean spectral ratios will be obtained for those
stations where multiple-event data are available.
o Throughout this report only velocity seismograms have been used. The
acceleration seismograms are currently being studied to obtain res
ponse spectra and Fourier spectral ratios and to compare these with
spectral ratios from velocity seismograms.
o Information on epicentral coordinates, magnitudes, and depths of the
aftershocks recorded in these experiments was not available during the
preparation of this report. This information is essential to pursue
further seismological studies. Further work to obtain epicentral dis-
61
tances from S-P times is currently in progress and these will be com
pared with actual data of epicentral coordinates to be obtained from
the Geophysical Institute of the University of Chile.
REFERENCE
Rogers, A.M., Borcherdt, R.D., Covington, P.A., and Perkins, D.M., 1984, A
comparative ground response study near Los Angeles using recordings of Ne
vada nuclear tests and the 1971 San Fernando earthquake: Bulletin,
Seismologieal Society of America, 74, No. 5, pp. 1925-1949.
62
100
10
EVENT 2100652 (JULY 29,1985) (VERT. Comp.)
CBA/VAL
4 6 HZ
10
EVENT 2101609 (JULY 29,1985) (VERT. Comp.)
CBA/VAL
4 6 HZ
100
1 -
EVENT 2111 208 (JULY 30,1 985) (VERT. Comp.)
CBA/VAL
4 6 HZ
Figure 1. Spectral ratios of three different events, respectively (vertical components) for stations CBA/VAL (Plots are log-linear for frequencies 0-10 Hz).
63
EVENT 2100652 (JULY 29,1985) (N-S Comp.)
CBA/VAL
4 6 HZ
100
EVENT 2101609 (JULY 29,1985) (N-S Comp.)
CBA/VAL
4 6 HZ
10
EVENT 2111 208 (JULY 30,1 985) (N-S Comp.)
CBA/VAL
0. 1
HZ
Figure 2. Spectral ratios of three different events, respectively (N-S com ponents) for stations CBA/VAL.
64
100
0. ]
EVENT 2 I 00652 (JULY 29, I 985) (E-W Comp.)
CBA/VAL
HZ
EVENT 2101609 (JULY 29,1985) (E-W Comp.)
CBA/VAL
HZ
EVENT 2111 208 (JULY 30,1 985) (E-W Comp.)
CBA/VAL
Figure 3. Spectral ratios of three different events, respectively (E-W com ponents) for stations CBA/VAL.
65
100
100
0.1
100
10
0.1
CBA/VAL
HZ
CE-W Comp.)
-I I L.
10
Figure 4. Superimposed spectral ratios of three different events for vertical and horizontal (N-S and E-W) components, respectively for stations CBA/VAL. '
66
EVENT 2 I 00652 (JULY 29,1 985) (VERT. Comp.)
CBB/CBA
EVENT 2101 609 (JULY 29, I 985) (VERT. Comp.)
CBB/CBA
EVENT 2111 208 (JULY 30,1 985) (VERT. Comp.)
CBB/CBA
Figure 5. Spectral ratios of three different events, respectively, and their superimposed plot (vertical components) for stations CBB/CBA. __
67
EVENT 2100652 (JULY 29,1985)
(N-S Comp.)
EVENT 2101609 (JULY 29,1985) (N-S Comp.)
CBB/CBA
EVENT 2111 208 (JULY 30,1 985) (N-S Comp.)
CBB/CBA
Figure 6. Spectral ratios of three different events, respectively, and their superimposed plot (N-S components) for stations CBB/CBA.
68
EVENT 2100652 (JULY 29,1985) CE-W Comp.)
EVENT 2101609 (JULY 29,1985) (E-W Comp.)
CBB/CBA
EVENT 2111 208 (JULY 30,1 985) (E-W Comp.)
CBB/CBA
Figure 7. Spectral ratios of three different events, respectively, and their superimposed plot (E-W components) for stations CBB/CBA.
69
EVENT 2 I 00652 (JULY 29,1 985) (VERT. Comp.)
CBC/CBA
EVENT 2101609 (JULY 29,1985)
EVENT 2111 208 (JULY 30,1 985) (VERT. Comp.)
CBC/CBA
Figure 8. Spectral ratios of three different events, respectively, and their superimposed plot (vertical components) for stations CBC/CBA.
70
iOOp-
EVENT 2100652 (JULY 29,1985)
(N-S Comp.)
CBC/CBA
EVENT 2101609 (JULY 29,1985) (N-S Comp.)
EVENT 2111 208 (JULY 30,1 985) (N-S Comp.)
CBC/CBA
Figure 9. Spectral ratios of three different events, respectively, and their superimposed plot (N-S components) for stations CBC/CBA.
71
EVENT 2 I 00652 (JULY 29, I 985) (E-W Comp.)
CBC/CBA
CBC/CBA
EVENT 2101609 (JULY 29,1985)
(E-W Comp.)
EVENT 2111208 (JULY 30,1 985)
Figure 10. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations CRC/OBA.
72
100
10
0. 1
EVENT 2 I 00652 (JULY 29* I 985) (VERT. Comp.)
CBE/CBA
HZ
100
: EVENT 2 101 609 (JULY 29,1985) (VERT. Comp.)
10
0. 1
CBE/CBA
HZ
100
10
0. 1
10
10
CBE/CBA (Vert. Comp.)
10HZ
Figure 11. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations CPE/CBA.
73
100 1 ' ' 1 I I , , I , , , I , r
EVENT 2 I 00652 (JULY 29, I 985) (N-S Comp.)
10
CBE/CBA
0.1
HZ
100 , | , , I | I , I | I I I | ! I
EVENT 2101609 (JULY 29,1985) (N-S Comp.)
10
10
0. 1
CBE/CBA
10HZ
100
10
0. 1
CBE/CBA
HZ
(N-S Comp.)
10
Figure 12. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations CBE/CBA.
100
10
0.
EVENT 2100652 (JULY 29,1985) (E-W Comp.)
CBE/CBA
HZ
100
10
o.
EVENT 2101 609 (JULY 29, I 985) (E-W Comp.)
CBE/CBA
HZ
100
0. 1
10
10
10
Figure 13. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations CBE/CBA.
75
100
10
0.1
EVENT 2 I 00652 (JULY 29,1 985) (VERT. Comp.)
CBF/CBA
HZ
100 i i i i i i i i i , i i , , i r
; EVENT 2101 609 (JULY 29, I 985) (VERT. Comp.)
o. iHZ
100
10
10
0. 110
Figure 14. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations CBF/CBA.
76
100
10
o. i
EVENT 2100652 (JULY 29,1985) (N-S Comp.)
CBF/CBA
4 6 HZ
10
100
EVENT 2101609 (JULY 29,1985) (N-S Comp.)
CBF/CBA
lOOr
HZ10
10
Figure 15. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations CBF/CBA.
77
100
10
0. 1
EVENT 2 I 00652 (JULY 29,1 985) (E-W Comp.)
4 6 HZ
ID
100
EVENT 2101 609 (JULY 29 f I 985) (E-W Comp.)
10r
CBF/CBA
0.14 6
HZ10
100
0. 1
Figure 16. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations CBF/CBA.
78
100r
; EVENT 2110933 (JULY 30,1985)
CBD/CBA
10
0. I 1
(Vert. Comp.)
HZ10
lOOr
0. 1
EVENT 2111 208 (JULY 30,1 985)
100 F
0. 1
Figure 17. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations CBD/CBA.
79
100
lOr
1 -
0. 1
EVENT 2110933 (JULY 30,1985)
CBD/CBA
(N-S Comp.) I
10HZ
100
EVENT 2111 208 (JULY 30,1 985) (N-S Comp.)
CBD/CBA
0.1'10
HZ
100
Figure 18. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations CBD/CBA.
80
lOOr
0. 1
T i I r~
EVENT 2110933 (JULY 30,1985)
CBD/CBA
100
10
EVENT 2111 208 (JULY 30,1 985) <E-W Comp.)
CBD/CBA
0. 14 6
HZ10
lOOr
0. 1
Figure 19. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations CBD/CBA.
81
100
10
0. 1
EAC/VAL
EVENT 2 I 50204 (AUGUST 3,1 985)
(Vert. Comp.)
HZ10
100
0. 1
EVENT 2161857 (AUGUST 4,1 985)
100
0. 110
Figure 20. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations EAC/VAL.
82
100
: EAC/VAL
ID
0.1
EVENT 2 I 50204 (AUGUST 3,1 985)
(N-S Comp.)
HZ10
100
EAC/VAL EVENT 2161 857 (AUGUST 4,1 985)
(N-S Comp.)
100
0. 1
Figure 21. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations EAC/VAL.
83
lOOr
EVENT 2 I 50204 (AUGUST 3,1 985)
(E-W Comp.)
10
100
10
0. 1
EAC/VAL EVENT 2 1.6 I 857 (AUGUST 4,1 985)
(E-W Comp.)
HZ10
10
Figure 22. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations EAC/VAL.
84
lOOr
10
TRA/VAL
EVENT 2161857 (AUGUST 4,1 985)
(Vert. Comp.)
10HZ
100
10-
0. 1
EVENT 2191 002 (AUGUST 7,1 985)
10
100
10
Figure 23. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations TRA/VAL.
85
100
10
TRA/VAL EVENT 2161 857 (AUGUST 4,1 985)
(N-S Comp.)
10HZ
iOOr
TRA/VAL EVENT 2191 002 (AUGUST 7,1 985)
(N-S Comp.)
100
0. 110
Figure 24. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations TRA/VAL.
86
lOO
10
0.1
TRA/VAL
100
10r
0. 1
100
0.1
EVENT 2161 857 (AUGUST 4,1 985)
(E-W Comp.)
HZ
EVENT 2191002 (AUGUST 7,1 985)
(E-W Comp.)
HZ
(E-W Comp.)
HZ
10
10
10
Figure 25. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations TRA/VAL.
87
100
10 r
0. 1
REN/VAL
EVENT 2 I 50204 (AUGUST 3,1 985)
(Vert. Comp.)
100
HZ10
10
0. 1
REN/VAL
EVENT 2 16 I 857 (AUGUST 4,1 985)
(Vert. Comp.)
HZ10
100
0. 110
Figure 26. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations REN/VAL.
88
100
10
0. 1
REN/VAL
100
10-
0. 1
REN/VAL
100
0. 1
EVENT 2 I 50204 (AUGUST 3,1 985)
(N-S Comp.)
HZ
EVENT 2161 857 (AUGUST 4,1 985)
HZ
10
10
Figure 27. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations PEN/VAL.
89
100
0.1
EVENT 2 I 50204 (AUGUST 3.1 985)
(E-W Comp.)
4 6 HZ
10
100
10
0. 1
REN/VAL
100
0. 1
EVENT 2161 857 (AUGUST 4,1 985)
(E-W Comp.)
HZ10
Figure 28. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations REN/VAL.
90
100
lOr
0.1
MUN/VAL
EVENT 2161857 (AUGUST 4,1 985)
(Vert. Comp.)
4 6 HZ
10
100
0. 1
EVENT 2191 002 (AUGUST 7,1 985)
100
0. 1
Figure 29. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations MUN/VAL.
91
100
10
0. 1
MUN/VAL
lOOr
10
0. 1
MUN/VAL
100
10
0.
MUN/VAL
EVENT 2161 857 (AUGUST 4, I 985)
(N-S Comp.)
10HZ
EVENT 2191002 (AUGUST 7 t I 985)
(N-S Comp.)
10HZ
(N-S Comp.)
10HZ
Figure 30. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations MUN/VAL.
92
100
10
0. 1
MUN/VAL
100
10
0. 1
MUN/VAL
100
10
0. 1
MUN/VAL
i ' i ' ' ' i ' ' "~
EVENT 2161 857 (AUGUST 4,1 985)
(E-W Comp.)
10HZ
EVENT 2191 002 (AUGUST 7 f I 985)
(E-W Comp.)
10HZ
(E-W Comp.)
10HZ
Figure 31. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations MUN/VAL.
93
100 I I I I I I I I I I I
EVENT 2 I 50204 (AUGUST 3,1 985) (Vert. Comp.)
0. 1
HZ
100
10
0. 1
EVENT 2 I 50204 (AUGUST 3,1 985) (N-S Comp.)
QCL/VAL
HZ
lOOf
EVENT 2 I 50204 (AUGUST 3,1 985) (E-W Comp.)
10
10
Figure 32. Spectral ratios of one event for vertical and horizontal (N-S and E-W) components, respectively, for stations QCL/VAL.
94
100
10
EVENT 2 I 50204 (AUGUST 3 t I 985) (Vert. Comp.)
HER/VAL
4 6 HZ
10
100
10
0. 1
i i i i i i i i i i I I
EVENT 2 I 50204 (AUGUST 3 t I 985)
HER/VAL
HZ
100
10
0. 1
EVENT 2 I 50204 (AUGUST 3 t I 985)
HER/VAL
...
HZ
(N-S Comp.)
I ...
10
(E-W Comp.)
10
Figure 33. Spectral ratios of one event for vertical and horizontal (N-S and E-W) components, respectively, for stations HER/VAL.
95
100
10
0. 1
EVENT 2 I 50204 (AUGUST 3,1 985)
YNE/VAL
HZ
100
10
0. 1
YNE/VAL
HZ
100
lOr
1 *
0. 1
EVENT 2 I 50204 (AUGUST 3,1 985)
YNE/VAL
4 6 HZ
(Vert. Comp.)
10
EVENT 2 I 50204 (AUGUST 3,1 985) (N-S Comp.)
10
(E-W Comp.)
10
Figure 34. Spectral ratios of one event for vertical and horizontal (N-S and _ E-W) components, respectively, for stations YNE/VAL.
96
APPENDIX ACANAL BEAGLE EXPERIMENT
SEISMOGRAMS, POORIER AMPLITUDE SPECTRA, AND SPECTRAL RATIOS
The objective of this appendix is to provide in a compact format the
seismograms, Fourier amplitude spectra and spectral ratios related to Canal
Beagle experiment only. Selected plots of data processed by C. Mueller and J.
Watson are presented herein.
The plots are organized as follows:
Event Type of Plot Figure(s)
2100652
2101609
2110933
2111208
SeismogramsFourier amplitude spectraSpectral ratios
SeismogramsFourier amplitude spectraSpectral ratios
SeismogramsFourier amplitude spectraSpectral ratios
SeismogramsFourier Amplitude SpectraSpectral Ratios
A1-A3 A4-A9 A10-18
A19-A21 A22-A27 A28-A36
A37-A39 A40-A45 A46-A50
A51-A53 A54-A60 A61-A70
A
RSGRF:22-OCT-85. PLOT DECIMflTED BT:2
^MMf^ ^ 210065234.VfiL UP. 0.0
2l00652S«.CBfl UP, 0.0
0.10
0.08
0.06
O.oy
0.02
210065254.CBB UP, 0.0
2100652S4.CBC UP, 0.0
]<$( 2100652S4.CBE UP, 0.0
2100652S4.CBF UP. 0.0
10 20 SECS
30
Figure Al. Scaled seignograms for event 2100652S (vertical components)
A-l
RSGRF:22-OCT-85. PLOT DECIMflTED BT:2
0.10 r
0.08 -
0.06 -
enze_»
0.04
0.02 -
^
10 20 -SECS
-2100652S5.VflL H*0, 0.0
2100652S5.CBfl H=0, 0.0
2100652S5.CBB H=0, 0.0
2100652S5.CBC H=0, 0.0
f\ 2100652S5.CBE H=0. 0.0
2100652S5.CBF H=0, 0.0
30
Figure A2. Scaled seismograms for event 2100652S (N-S components)
A-2
flSGRF:28-OCT-85. PLOT DECIMRTED BYs2
0.20 r
0.15
0.10
0.05
210065256.VflL H-90. -2.30
210065256.CBfl H=90. -2.30
2100652S6.CBB H=90, -2.30
2100652S6.CBC H=90, -2.30
2100652S6.CBE H=90, -2.30
Note: Because of a timing "glitch" at2.2 seconds, of station CBE records, plots were corrected by skipping into the trace by 2.3 seconds.
JJ21D0652S6.CBF H=90. -2.30
11
105ECS
20 30
Figure A3. Scaled seismograms for event 2100652S (E-W components).
A-3
c.ow
0.00?
Figure A4. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.
A-4
ISSJ56.CBH B,OT
Figure A5. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBA.
A-5
2iooes?ss cm i
Figure A6. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBB.
A-6
J100S5M5.CBC »*0
Figure A7. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBC.
A-7
Figure A8. Time series and Fourier amplitude spectra of event on July 29 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBE.
A-8
Figure A9. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBF.
A-9
2100652SU.CBR V
OPS=RDC
2100652S5.CBR H=0
OPS=
flDC
2100652S6.CBR H=
90
OPS=
flDC
0.01
-0.01
1510
2t0
06
52
Sii.
VflL
V
OP
S=R
DC
SECS
2100652S5.VRL H=0
OPS=ROC
SECS
0.00
4 r
15
0.01
0
-0.01
10
2100652S6.VRL H=9D
OPS=
ftDC
SECS
0.005
-/
-0.005 -
15
IDOr
0.1
100 10
0. 1
too
1020
HZ
10
300. 1
1020
HZ30
Figu
re A1
0. S
caled
seismograms
and
spec
tral
ra
tios
of
even
t on
July
29,
1985
(Julian
210) at
06:52 for
the
vertical,
horizontal (N
-S a
nd E
-W)
components,
resp
ecti
vely
, for
station
CBA/VAL.
2100652SU.CBB V
OPS=RDC
2100652S5.CBB H=0
OPS=
PDC
2100652S6.CBB H=
90
OPS=PDC
0.02
r 2100652S
U.V
RL
V O
PS=F
1DC
2100652S5.VPL H=0
ops=
noc
O.O
OU
r
21
00
65
2S
6.V
PL
H
=90
OPS
=F1D
C
0.0
05
-/
-0.0
05
-
lOO
i i
i ,
, i
i i
, i
10
[ I I I U
J I 1
J
I I I I L
_I 1
1
_J
I I I I 1
_J
I
i -l-
0 10
20
H
Z
100
30
100
30
ID
0.
I10
20
HZ
30
Figu
re Al
l. S
cale
d seismograms
and
spec
tral
ra
tios
of
event
on J
uly
29,
1985
(Julian
210)
at
06:52 for
the
vertical,
horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, for
station
CBR/
VAL.
2100
652S
U.CB
C V
OPS=flOC
2100652S5.CBC
H=0
OPS=flDC
2100652S6.CBC
H=90
OPS=flDC
0.02
-0.0
2
2100
6523
4.Vf
lL V
OPS=
nDC
10
SE
CS
15
I I »
r\D
0.0
01
4
0.0
02 0
-0.0
02
-0.0
01 100 I0r
0. 1
10
SE
CS
15
1020
HZ
O.O
U
0.0
2 0
-0.0
2
-O.O
li
20
2l00
652S
5.Vf
lL H=0
OPS=
ROC
10
SECS
15
20
O.O
Oil
0.0
02 0
-0.0
02
-O.O
Oil
C
100 10
300. I
10
SECS
15
1020
HZ
20-0.05
2100652S6.VRL
H=90
OPS=
RDC
10
SECS
15
0.00
5 -/
20
-0.005 -
100
300. L
20
Figure A1
2. S
caled
seis
mogr
ams
and
spec
tral
ra
tios
of
event
on J
uly
29,
1985 (J
ulia
n 210) at
06:
52 for
the
vert
ical
, horizontal (N-S a
nd F
-W)
components,
resp
ecti
vely
, for
station
CBC/
VAL.
2100
652S
U.CB
E V
OPS=
RDC
2100
652S
5.CB
E H=0
OPS=
RDC
0.01
0
-0.0
1
-0.0
2
0.01
0
-o.o
i
210065254.VRL V
ops=
noc
10
SECS
1520
2100652S5.VRL
H=0
OPS=
flDC
10
SE
CS
O.O
Oii
i-
1520
2100
652S
6.CB
E H=90
OPS=
RDC
TIME
i 0
= 3.00
0.02
0.01
-O.Ol
2100652S6.VflL H=90
OPS=flDC
TIME:
0 =
3.00
10
SECS
0.00
5
-0.0
05
15
\ \
20
lOOl
I ,,,,!!,
I
10
0. t
1020
HZ30
100 10
0.1
to20
HZ30
100 10
0. I
i I
i i
I I
I 1_J I
1020
HZ30
Figu
re A1
3. Sc
aled
seismograms
and
spec
tral
ra
tios
of
event
on J
uly
29,
1985 (Julian
210)
at 0
6:52 fo
r th
e ve
rtic
al,
horizontal (N
-S an
d E-
W) components,
respectively,
for
station
CPE/VAL.
2100B52SU.CBF
Vops=noc
2100
652S
5.CB
F H=
0 OP
S=fl
DC2100652S6.CBF
H=90
OPS=
RDC
2100
652S
I1.V
RL
VOP
S=fl
DC2100652S5.VRL H=0
OPS=
flDC
0.00
11F
/
10
SEC
S15
20
2100652S6.VRL H=
90OPS=RDC
10
SECS
0.00
5
-0.005
-
15
10
SECS
15
20 20
100 10
0. 1
1020
HZ
30
100
0. I
0. I
Figure A14. S
cale
d seismograms
and
spectral ratios of
ev
ent
on J
uly
29,
1985 (J
ulia
n 21
0) at
06:
52 for
the
vertical,
horizontal (N-S a
nd F
r-W) co
mpon
ents
, re
spec
tive
ly,
for
station
CBF/VAL.
2100652SU.CBB V
OPS=
flDC
2100652S5.CBB H=0
OPS=
flDC
2100652S6.CBB H=90
OPS=
flDC
I H-»
cn
2100
652S
U.CB
FI V
OPS=
flDC
0.01
5
0.010
0.005 0
-0.005
-0.010 10
0 10
10SECS
0.02 -
-0.02
- 2100652S5.CBF) H=0
OPS=
flDC
2100652S6.CBR H=90
OPS=
flDC
15
100
O.I
1 . ..' .
I .......
i .
I .........
0 10
20
30
10SECS
SECS
too 10
0. 1
1020
HZ
15
30
Figu
re A15.
Sc
aled
seismograms
and
spec
tral
ra
tios
of
event
on J
uly
29,
1985 (Julian
210)
at
06:52
for
the
vert
ical
, ho
rizo
ntal
(N
-S an
d E-W) co
mpon
ents
, re
spec
tive
ly,
for
stat
ion
CBB/CBA.
2L00
652S
U.CB
C V
OPS=
RDC
210065235.CBC
H=0
OPS=
RDC
2100
6523
6,CB
C H=
90
OPS=
RDC
0.02
-0.02
2100652SU.CBR
V OP
S=RD
C
10
SEC
S15
0.0
15
r-
100 ID
SEC
S
1020
HZ
O.O
li
0.0
2 0
-0.0
2
-O.O
li
20
2100652S5.CBR
H=0
OPS=
RDC
10
SECS
15
15
O.OL
-0.01 lOOr
300. t
10SECS
0.05
20-0
.05 .
2100
652S
6.CB
R H=90
OPS=
RDC
10
SECS
0.01
15
100 10
0. 1
10
10SECS
15
20HZ
20
15
30
Figu
re A1
6. S
caled
seis
mogr
ams
and
spectral ratios of ev
ent
on J
uly
29,
1985
(Julian
210)
at 0
6:52
for
the
vertical,
hori
zont
al (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, for
station
CBC/
CBA.
2100652SU.CBE V
OPS=RDC
2100652S5.CBE H=0
OPS=RDC
2100652S6.CBE H=90
OPS=RDC
TIME:
0 =
3,00
210D652SU.CBR V
OPS=RDC
0.015
0.010
0.005 0
-0.005
-0.010
1015
2l00
652S
5.CB
fl H=0
OPS=RDC
0.01
0
-0.01
J|t^^
10
\
15
2100652S6.CBR H=90
OPS=RDC
TIME:
0 =
3.00
-0.01
r
10SE
CSSE
CSSE
CS
100 lOr
0.1
1020
HZ30
100
0. 1
30
lOr 1 -
0. 1
1020
HZ30
Figure A1
7. S
caled
seis
inog
rams
an
d sp
ectr
al ra
tios
of
ev
ent
on J
uly
29,
1985
(Julian
210)
at 0
6:52
for
the
vertical,
horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, for
station
CBE/
CBA.
2100652SU.CBF V
OPS=
flDC
2100652S5.CBF H=0
OPS=
fiDC
2100652S6.CBF H=90
OPS=
flDC
0.02
0.01
0
-0.01
-0.0
2
2100652S4.CBR V
GPS=
flDC
0.0
15
0.0
10
0.0
05 0
-0.0
05
-0.0
10
10
SEC
S15
20
1015
0.0
4
0.0
2 0
-0.0
2
-0.0
4
F/
2100652S5.CBR H=0
OPS=
flDC
10
SECS
0.01
10
1520
15
0.04
0.02
0
-0.02
-0.0
4
2100652S6.CBR H=
90
OPS=
flDC
10
SECS
0.01
15
10
20
15SE
CSSE
CSSE
CS
lOOi
i i
i i
i i
i i
i
10 r
O.I
1020
HZ
100
300. I
100 ID
0. I
ID20
HZ30
Figu
re A
18.
Scaled se
ismo
gram
s an
d sp
ectr
al ra
tios
of
even
t on
July
29,
1985
(Julian
210)
at 0
6:52
for
the
vertical,
horizontal (N-S a
nd E
-W)
comp
onen
ts,
respectively,
for
stat
ion
CBF/
CBA.
RSGRF:22-OCT-85. PLOT DECIMfiTED BT:2
0.3 r
0.2 -
0.1
0 L
2101609N4.VRL UP, 0.0
2101609NIJ.CBR UP. 0.0
^wMMr***^^ up. o.o
^ 2101609N4.CBC UP. 0.0
bW^^f^M^i^ UP. o.o
fj^l^^2101609N4.CBF UP, 0.0
10 20SECS
30
Figure A19. Scaled seismograms for event 2101609 (vertical components).
A-19
L :
fiSGRF:22-OCT-85. PLOT DECIMflTED BT:2
O.U
0.3
0.2
0.1
0 L
2101609N5.VRL H=0, 0.0
*2101609N5.CBR H=0, 0.0
2101609N5.CBB H-0, 0.0
2101609N5.CBC H=0, 0.0
'f^ljfjjf^^ 2101609N5.CBE H=0, 0.0
2101609N5.CBF H=0, 0.0
10 20 SECS
30
Figure A20. Scaled seismograms for event 2101609 (N-S components)
A-20
fiSGRF:22-OCT-85. PLOT DECIMRTED BY:2
0.8 -
0.6 -
o.y -
0.2 -
2101609N6.VRL H=90, 0.0
2101609N6.CBR H=90, 0.0
*2101609N6.CBB H=90, 0.0
0 L
H=90, 0.0
2101609N6.CBE H=90, 0.0
10 20 SECS
2101609N6.CBF H=90, 0.0
30
Figure A21. Scaled seisnograms for event 2101609 (E-W components)
A-21
^tJ^l1lj4^t^*v*^^
/J|i, |^|\jY^Vi/ryYv*'^M"^^
f||^
Figure A22. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.
A-22
IH
Figure A23. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBA.
JIOI6CIW6.C88 M.90
J|^^
II
Figure A24. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBB.
A-24
JI01609H6.CBC "
f|i^^4^
Figure A25. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBC.
A-25
iioiecw
Figure A26. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBK.
Jim BOWS, cer
Figure A27. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBF.
A-27
2lOl
609N
U.CB
fl V
OPS=flDC
2101609N5.CBH
H=0
OPS=flDC
21D1
609N
6.CB
R H=9Q
GPS=flDC
2101609NU.VRL V
OPS=RDC
01
0 ot 0210
SECS
1520
2lOl
609N
5.Vf
lL H=0
OPS=
RDC
0.0
2
0.01
0
-0.0
1
-0.0
2
_/ -
\
Illll
tyty
ty^
10
SEC
S15
20
2101609N
6.V
FIL
H
=90
OPS
=P)D
C
0.0
3
0.0
2
0.01
0
-0.0
1
-0.0
210
SE
CS
1520
100 10
0. t
1020
HZ
lOO
tr
300.
1
100 ID
0. I
1020
HZ
30
Figu
re A2
8. S
caled
seis
mogr
ams
and
spectral ra
tios
of
ev
ent
on J
uly
29,
1985 (Julian
210) at
16
:09
for
the
vert
ical
and
horizontal (N
-S a
nd E
-W)
components,
respectively,
for
stations C
BA/V
AL.
2101
609N
U.CB
B V
OPS=
flDC
2101
609N
5.CB
B H=0
OPS=
flDC
2101609N6.CBB
H=90
OPS=flOC
2lO
l609N
li.V
flL
V O
PS
=flO
C2lOl609N5.VflL H=0
OPS=
flDC
0. 1
-O.I r 210l
609N
6.Vf
lL H=
90
OPS=flDC
'
0.0
2
0.0
1 0
-0.0
1
_n
no
\/
r jL : i
i i
i 1
i
,
\
iJJjk
.^y^,,.^
^^^
-WiM
lt
fP
, 1
, ,
, ,
1 .
. .
. 1
10
SECS
1520
100
0.1
1020
HZ
100
30
10
0. 1
1020
HZ
lOOr
30
Figu
re A2
9. S
caled
seisnograms
and
spec
tral
ratios of
event
on J
uly
29,
1985
(J
ulia
n 210) at
16:09
for
the
vertical and
horizontal (N-S a
nd F
-W)
comp
onen
ts,
respectively,
for
stations C
BB/V
AL.
(O ^ £ o
0.05
0
-0.05
-0.10
-0.15
02101
609N
U.CB
C V
3PS=
flDC
h^w**^^
: . i .
. i . .
.1 . i ,
i , 1 1
, 1. 1 ,
i5
10
15
20
SECS
2101
609N
4.VR
L V
DPS=flDC
210I609N5.CBC
H=0
OPS=
RDC
2101
609N
6.CB
C H=
90
GPS=flDC
-0.1
- 2lO
l60
9N
5.V
flL
H
=0
OP
S=f
lDC
2101609N
6.V
RL
H=9
0 O
PS
=flD
C
0.0
1 0
-0.0
1
-0.0
2Ci
, ,
. ,
i ,,,,,,,.,,,,,,,
-°-0
25
10
15
20
C SE
CS
/ -
^^^^
^t
_, L
.j^
"
"'' '' ''
5
X^
u.u
d
0.0
2
y( 1
<" o.
o i
i^p^^yvw
^w
r
i.
-0.0
1
1 '
' '
' '
'
' '
'
-0.0
210
15
20
C SE
CS
\/
I [
1
5
\
1 i fl[l4
l,^llli.iktlii«
WU
l.M
.4U
iin>
'-- -.
"...
jjiftttjW
^^
, 1
1 .
. !
1 .
. .
. I
10
15
20
SEC
S
100 lO
r
0.
I
100 10
0. I
1020
HZ
100
30
10 r
0. I
Figu
re A30. S
cale
d se
ismo
gram
s and
spec
tral
ratios of
ev
ent
on J
uly
29,
1985
(Julian
210) at
16:09
for
the
vertical and
horizontal (N
-S a
nd E
-W)
comp
onen
ts,
respectively,
for
stations C
PC/VAL.
2101609N
U.C
BE
V
OP
S=f
lDC
0.01
4
0.0
2 0
-0.0
2
-O.O
U
210l609Nli.VfiL
V OP
S=fl
DC
10
SECS
O.Dl 0
-0.01
-0.02
10
SECS
1520
1520
2101609N5.CBE H=0
OPS=
flDC
-0.02
-
-0.04
- 2101609N5.VRL H=0
OPS=
flDC
0.02
0.01
0
-0.01
-0.02
VKfHf***********
1
10
SECS
1520
2101609N6.CBE H=90
OPS=
flDC
TIME:
0 =
2.50
0.05 -
-0.0
5 - 2101609N6.VRL H=90
OPS=
flDC
TIME
s 0
= 2.50
0.03 r
100 10
1020
HZ
100
30
100 10
0. 1
20HZ
30
Figu
re A3
1. Scaled seis
mogr
ams
and
spectral ratios of event
on J
uly
29,
1985
(Julian
210)
at
16
-09
for
the
vertical and
hori
zont
al (N-S a
nd E
-W)
components,
respectively,
for
stations C
PK/V
AL.
2101609NU.CBF V
OPS=
flDC
2L01609N5.CBF H=0
OPS=
flDC
2101609N6.CBF H=90
OPS=
flDC
oo
ro
O.OU
0.02
0
-0.0
2
-0.04
2101609NU.VOL.
V
OPS=
F)DC
10
SECS
-0.0
2
20
0.05
-0.05
- 2101609N5.VRL H=0
OPS=
flDC
0.0
2
0.0
1 0
-0.0
1
-0.0
2
_/
\
fr
iM****'*
*""
' *'^
|||j|ft|^
L 1
E ,
, i
, 1
. ,
, ,
1 L
i i
, 1
i .
i i
1
10
SECS
1520
2101609N6.VRL H=90
OPS=
F)DC
0.03
E-
tOOr
10
0. 1
1020
HZ
100
300. 1
lOO
30
0. 1
Figu
re A32. S
cale
d se
ismo
gram
s and
spec
tral
ra
tios
of ev
ent
on J
uly
29,
1985 (Julian
210) at 16
:09
for
the
vertical and
horizontal (N-S a
nd E
-W)
components,
respectively,
for
stations C
BF/V
AL.
2101609NU.CBB V
OPS=RDC
2101609N5.CBB H=0
OPS=
flDC
2101609N6.CBB H=90
OPS=
ROC
21D1609N4.CBR V
OPS=RDC
2101609N5.CBR H=0
OPS=
flDC
O.I 0
-0.
1
2101609N6.CBR H=
90
OPS=RDC
10
SECS
0. 1
5
0. 1
0
0.05
0
-0.05
10
SECS
\
1520
"\
<rff
Nw
1520
100r
r-r-
T
10
0,1
1020
HZ30
100 lOr
1 -
0. I
1020
HZ30
LOO 10
0. I
1020
HZ30
Figu
re A3
3. S
cale
d^ sei
gnog
rams
and
spectral ra
tios
of
even
t on
July
29,
1985 (Julian
210) at 16
:09
for
the
vertical and
horizontal (N-S a
nd E
-W)
comp
onen
ts,
respectively,
for
stat
ions
CBB
/CBA
.
2lO
t60
9N
li.C
BC
V
GP
S=f
iDC
2101609N5.CBC
H=0
GPS=
RDC
2101609N6.CBC
H=90
OPS=
RDC
2l0
16
09
NU
.CB
fl V
OPS
= F
IDC
-o.t
- 2101
609N
5.CB
R H=0
OPS=
nDC
0.01
4 I-
2101
609N
6.CB
fl H=90
OPS=
nDC
0. 15
0. 1
0
0.05
0
-0.0
5
10
SECS
15
\
20
100
0. t
100
30
lOr
0. 1
1020
HZ
100
30
10
0. I
1020
HZ30
Figu
re A3
4. S
caled
seis
nogr
ams
and
spectral ra
tios
of
even
t on
July
29,
1985
(Julian
210)
at 16-09
for
the
vertical and
horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
velv
. for
stations
2101
609N
I1.C
BE
V
OPS
=RD
C2101609N5.CBE H=0
OPS=
ROC
21
0t6
09
Nii.
CB
fl V
OPS
=RD
C2101609N5.CBR H=0
OPS=RDC
2101609N6.CBE H=90
OPS=
RDC
TIME
s 0
= 2.
50
0.05
-
-0.0
5 - 2101609N6.CBR H=90
OPS^RDC
TIME
s 0
= 2.
50
100 10
0. 1
1020
HZ30
100 10
I r
0. 1
1020
HZ30
100 10
0. I
1020
HZ30
Figu
re A3
5. Scaled se
ismo
gram
s and
spec
tral
ratios of ev
ent
on J
uly
29,
1985
(Julian
910)
at 16:09
for
the
vertical and
horizontal
(N-vS and
E-W) co
mpon
ents
, re
spec
tive
ly,
for
stations C
BE/C
BA.
2101609NU.CBF V
OPS=PDC
2101609N5.CBF H=0
OPS=
flDC
-0 -0
0.05
-0.05
-
2101609NU.CBP V
OPS=
fiDC
10
SECS
1520
2101609N5.C8R H=0
OPS=
flDC
210I609N6.CBF H=90
OPS=
fiDC
210I609N6.CBP H=
90
OPS=
fiDC
\
4^^^
10 SECS
1520
100r
-r100
0.1
30
10
0. 1
1020
HZ30
Figure A3
6. S
cale
d seis
mogr
ams
and
spec
tral
ra
tios
of
even
t on
July
29,
1985
(J
ulia
n 21
0) at 16:09
for
the
vertical and
horizontal
(N-v
S and
E-W)
co
mpon
ents
, respectively,
for
stations C
BF/CBA.
fiSGRF:22-OCT-85. PLOT DECIMflTED BY:2
0.4
CT,
d>to
d>-Q
4->rs o
dj
dj
0.3
0.2
0.1
O
to+->c dJcO dJ CL > E fO O 5 O I
CO
21l0933SU.VflL UP, 0.0
2110933SU.MUN UP. 0.0
1093354.CBB UP, 0.0
2\ 10933SU.CBC UP. 0.0
nfl^^ 2110933SU.CBD UF. 0.0
f^M^^^ 2110933S4.CBE UP. 0.0
10 SECS
15 20
Figure A37. Scaled seismograms for event 2110933 (vertical components).
A-37
RSGRF:22-OCT-85. PLOT DECIMflTED BY:2
21l0933S5.VflL H=0. 0.0
2110933S5.MUN H=0, 0.0
0.6
0.4
0.2
0 L
^ ^jljl^^^ 10933S5.CBB H-0, 0.0
H=0 -
2110933S5.CBD H»0. 0.0
^JfJ^[^^ 10933S5.CBE H=0. 0.0
10SECS
15 20
Figure A38. Scaled seisinograms for event 2110933 (N-S components).
ftSGRF:22-OCT-85. PLOT DECIMflTED BT:2
2110933S6.VflL H=90, 0.0
2110933S6.MUN H=90, 0.0
fjtytfWtyWIu^ H=90, 0.0
0.8
0.6
toV.z o
0.2
0 L
2110933S6.CBC H=90, 0.0
Ifr^jl/lM^ H=9 °*
*jfiJftlllfl/\M*hhl^^ »^wArV«^ ^-*^r 2110933S6.CBE H=90. 0.0
ID SECS
15 20
Figure A39. Scaled seismograms for event 2110933 (E-W components)
A-39
Figure A40. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations VAL.
A-40
i!09335S "UN M.90
Figure A41. Time series and Fourier amplitude spectra of event on July 30 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations MUN.
Figure A42. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations CBB.
A-42
JIIOS33S1.CBC
^ ^
>|||taMfyWM*'VwVW'*»v*»^ *^
Figure A43. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations CBC.
._.. ______
^ ~
^\jbJ{}\l\J\J\tyW*^^ -
Figure A44. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations CBD.
|fj||||||fjfl^^
?II093356.C»E K-90
tyt^4iVv^^
Figure A45. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations CBE.
A-45
2U
0933S
U.M
UN
V
OPS
=RD
C2
U0
93
3S
5.M
UN
H
=0
OP
S=f
lDC
2110933S6.MUN
H=90
OPS=flDC
2110933S
li.V
flL
V O
PS=R
DC
02 01
-0.0
1
10
SEC
S
0.0
5
-
-0.0
5
-
0.0
5 r
-0.0
5
-
2ll0
93
3S
5.V
flL
H
=0
OPS
=RD
C
\
fa
WV
WW
tA.
O
1520
2U
09
33
S6
.VR
L
H=9
0 O
PS
=fiD
C
100
0.1
100 10
0.
I10
20H
Z
100
30
10
0.
110
20H
Z30
Figu
re A46. S
caled
seis
mogr
ams
and
spectral ratios of event
on J
uly
30,
1985 (Julian
211)
at
09-33 for
the
vertical,
horizontal (N
-S a
nd E
-W)
components,
respectively,
of stations M
IJN/VAL.
0.0
5 0
-0.0
5 C
0.0
2
0.0
1
-0.0
1
C2110
933S
U.C
BB
V
OP
S^f
lDC
' Jfa
MM
^to
Jito
ltfo
frM
talL
uL
im.»
.v.-i
>-.r
"
°:
f****w
jjpf^
**w
t» i*
^,,<
* ..
g
''iiil»
iiil»
iiilii.il
-0.2
21
10
93
3S
5.C
BB
H
=0
OPS
=RD
C
1 i
i i
1 1
1 i
i I
1 i
i i
1 i
1 1
1 1
5 10
15
20
0
5
10
15
20
SE
CS
SE
CS
21 1
093354.
VflL
V
21 1
09
33
S5
. V
flL
H=0
D
PS
=flD
C
OP
S=f
lDC
-
0.0
15
[r
\S
^
o.ot
o
: ,
i| «
0
.00
5
~ j
]ii
"^"-
--
Ate
^MM
ttB
Siil
Wiff
i 'p
1JlA
UA
*Ml*
Jufc
*A«
vJl<
*»^^
S
1 If
1L
1 -0
.005
: '
' '
' '
' ' i
' 1
i i
i i
1 i
i i L
1 -0
.0 ID
y i
x\ ̂44w
^| !||^
^W
^^^^^^-
r i
, i
, 1
, ,
1 ,
1 i
i .
. 1
i ,
, i
1
5 10
15
20
05
10
15
20
SEC
S SE
CS
2U
0933S
6.C
BB
H
=90
OP
S=f
lDC
0.1 0
'-
-0.1
r 2U
0933S
6.V
RL
H=9
0 O
PS
=flD
C
0.0
1
-0.0
1
10
SEC
S15
20
100
0.
I
lOO
r
300.
I
100
30O
.I
Figu
re A4
7. S
caled
seismograms
and
spec
tral
ra
tios
of ev
ent
on J
uly
30,
1985
(Julian
211)
at
09:33 for
the
vertical,
horizontal (N-S a
nd E
-W)
components,
resp
ecti
vely
, of stations C
BB/VAL.
2110933SU.CBC V
OPS=RDC
0.0
5 0
0.0
5
0.
10
0.
15
211D933SU.VRL V
OPS=RDC
0.0
2
p-
0.0
1
E-
-0.0
1
~
10
SE
CS
2U
0933S
5.C
BC
H
=0
OP
S=f
lOC
2H
09
33
S6
.CB
C
H=
90
OP
S=R
OC
O.li i-
1520
2U
D933S
5.V
RL
H=
0 O
PS
=RO
C2110933S6.VRL H=90
OPS=
flOC
0.01
r
-0.01
r
100 10
0. 1
1020
HZ
IDOr
30
100 10
0. I
1 '
' '
1020
HZ30
Figu
re MS. S
cale
d se
ism^
rams
an
d spectral ra
tios
of
even
t on
July
30,
1985
(J
ulia
n 21
1) at 0
9:33 for
the
vert
ical
, horizontal (N-S a
nd E
-W)
components,
resp
ecti
vely
, of s
tati
ons
CBC/
VAL.
2H
09
33
SU
.CB
D
V O
PS
=flD
C2
U0
93
3S
5.C
BD
H
=0
OP
S=f
lDC
211093336.CBD H=90
GPS=
flDC
2110
933S
H.Vf
lL V
OPS=fiDC
2ll0
93
3S
5.V
flL
H
=0
OP
S^f
lDC
2ll0
93
3S
6.V
flL
H
=90
OP
S=f
lDC
0.01
r
-0.01
r
lOO
r-r
0. 1
100
0. 1
tOQ
0. I
Figu
re A4
9. S
cale
d seis
mogr
ams
and
spec
tral
ra
tios
of ev
ent
on J
uly
30,
1985 (Julian
211)
at 0
9:33
for
the
vertical,
horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, of stations C
BD/VAL.
21 1093334.CBE V
GPS=
flDC
2110933S5.CBE H=0
OPS=PDC
2U
0933S
6.C
BE
H
=90
OP
S=R
DC
TIM
E:
0 =
I.00
O.O
U r
0.0
5 r
-0.0
5
-
\
211093334.V
RL
V G
PS
=flD
C
-0.0
1
r
i en
O
tOr
2110933S
5.V
RL
H=
0 G
PS
=flD
C
SE
CS
21
10
93
3S
6.V
RL
H
=90
GP
S=P
DC
TIM
E:
0 =
1.0
0
SE
CS
0.0
15
r-
0.0
1
-0.0
1
lOOi
i i
i i
i i
i i
lOO
l I
I I
I I
I I
!
1020
30O
.I
HZ
lOO
r
lOr
30
0.
110
\
j^^^
i I
i10
S
EC
S15
20
20
30
HZ
Figu
re A5
0. Sc
aled
se
ismo
gram
s an
d spectral ra
tios
of
event
on J
uly
30,
1985 (Julian
211) at
09:
33 for
the
vertical,
horizontal (N
-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, of s
tations
CBE/VAL.
RSGRF:22-OCT-85. PLOT DECIMftTED BY:2
0.4
0.3
0.2
0.1
0 L
2111208RU.VflL UP. 0.0
11208RU.MUN UP. 0.0
^*fr"*2111208RU.CBfl UP. 0.0
||||^
10 SECS
2111208RM.CBC UP. 0.0
2111208R4.CBD UP, 0.0
UP, 0.0
15 20
Figure A51. Scaled seismograms for event 2111208 (vertical components)
A-51
fiSGRF:22-OCT-85. PLOT DECIMflTED BT:2
0.6
O.U
0.2
0 L
^jy
10 SECS
15
211l208R5.VflL H=0. 0.0
2111208R5.MUN H=0, 0.0
2111208R5.CBfl H=0. 0.0
2111208R5.CBB H=0. 0.0
2111208R5.CBC H=0. 0.0
21I1208R5.CBD H=0. 0.0
2111208R5.CBE H=0, 0.0
20
Figure A52. Scaled seismograms for event 2111208 (N-S components).
A-52
RSGRF:22-OCT-85. PLOT DECIMRTED BY:2
'2111208R6.Vfll_ H=90, 0.0
0.6
o.y
0.2
2111208R6.MUN H=90, 0.0
llfftJtVA^^ H=90. 0.0
2111208R6.CBB H=90. 0.0
2111208R6.CBC H=90, 0.0
2111208R6.CBD H=90. 0.0
2111208R6.CBE H=90. 0.0
10SECS
15 20
Figure A53. Scaled seignograms for event 2111208 (E-W components).
A-53
was"-*"1 "-°
Ofjinoc
Mr ^
Figure A54. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.
A-54
war- 1
sin; ars-i
Figure A55. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station MUN.
A-55
Figure A56. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBA.
A-56
Figure A57. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBB.
A-57
ll^l^l^l1^
I?OBIW.CBC HrtO
Figure A58. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBC.
A-58
S-o.os
-0.10
-0. IS
ftUHXK.CK) I
Figure A59. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBD.
A CQ
was"-
Figure A60. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBF.
A-60
21U
208R
U.M
UN
V
OP
S=R
DC
2U
1208R
5.M
UN
H
=0
OP
S=R
DC
2U
12
08
R6
.MU
N
H=
90
OP
S=R
OC
0.0
5
-0.0
5
21 t
l208R
4.V
qL
Vnr
n-no
r
0.0
2
10
SE
CS
10
SE
CS
1520
0.2
rr
O.I
r 21
U208R
5.V
RL
H=
0O
P5-
IIDC
0.02 I7
o.ot °
-0.0
1
-°-02
20
^$fa
***«
*ft
10
SE
CS
15
0.
I
-O.I
r 2111208R6.VOL H=90
OP
S^f
lDC
OM*-,V**
l**Vr- ,<v
-V 20
0.0
5
-0.0
515
\
100 ID
10
100 10 -
300.
Ia_J_l
10
20HZ
100 10
300.
1
Figu
re A6
1. S
caled
seis
mogr
ams
and
spectral ra
tios
of
event
on J
uly
29,
1985 (Julian
211)
at 12:08
for
the
vert
ical
, horizontal (N
-S and
E-W)
components,
respectively,
of stations M
UN/V
AL.
2U
1208R
U.C
Bfl
V O
PS
=flD
C2111208R5.CBR H=0
OPS=
flDC
2111208R6.CBR H=90
OPS=qDC
21U
208R
U.V
RL
Vnp
s-nn
c
10S
EC
S0
5
21
11
20
8R
5.V
qL
0.02
-0.0
2
10
SE
CS
15
X0.0
2
0.0
1 0
-0.0
1
-0.0
2
20
1 |
10
SECS
15
211 I208R6.
Vqi_
H=
90ops-noc
20
0.05
-0.05
, JfWiftftf^
ww
-
10
3EC
S15
20
lOO 10
0.?D
HZ
100 ID
300.
I10
20HZ
100
0. 1
30
Figu
re A6
2. S
cale
d seismograms
and
spec
tral
ra
tios
of ev
ent
on J
uly
29,
1985 (J
ulia
n 21
1) at 12
:08
for
the
vert
ical
, horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, of
stations
CBA/
VAL.
21
U2
08
RU
.CB
B
V O
PS
=flD
C21U
208R
5.C
BB
H
=0
OPS
=RD
C2111208R6.CBB H=
90
OPS=RDC
0.05
-0.05
- 2111208RU.VRL V
I CTl
0.02
-0.02
10
SECS 10
SECS
15 15
20
x
0.1 0
-O.I
ll^^
2111208R5.VRL H=0
OPS=ROC
10
SECS
0.02
0.01
<n i
0 o
-0.01
-0.02
2010
SE
CS
15 15
0. 15
0. 10
0.05
0
-0.0
5
^MW^^vw«^
y^
20
2111208R6.VRL H=
90
10 SECS
1520
X
0.05
J -0
.05
20
10
3ECS
X
20
IDr
0. I
1020
HZ
10
1020
HZ30
Figure A63. S
cale
d se
ismo
gram
s and
spectral ra
tios
of
event
on J
uly
29,
1985 (Julian
211)
at
12
:08
for
the
vertical,
horizontal (N
-S a
nd F
-W)
comp
onen
ts,
resp
ecti
vely
, of s
tations
CBB/VAL.
2U
12
08
RH
.CB
C
VO
PS
=RD
C2U1208R5.CBC H=0
OPS=RDC
2111208R6.CBC H=
90
OP5=RDC
0.
15 r
2111208RH.VRL V
ors=
rmc
0.02
-0.02
10
SECS
1520
21 1
1208R5. VRL H=0
OPS-
HUG
0.02
0.01
-0.01
-°-02
|iWW
nM^*
*^'^
'H'iI^
WN^
*
10
SECS
15
2111208R6.VRL H=
90
OPS-ROC
20
0.05
-0.05
10
SECS
1520
100 10
0.10
HZ
100
30
10-
0. I
1020
HZ
100
300. 1
Figu
re A64. S
cale
d se
ismo
gram
s and
spectral ra
tios
of ev
ent
on J
uly
29,
1985
(Julian
211) at
12:08
for
the
vertical,
horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, of stations C
BC/V
AL.
2111208RU.CBO V
OPS=RDC
2111208R5.CBD H=0
OPS=ROC
2H1208R6.CBD H=
90
OPS^RDC
\
>
01
0 5
21H208RU.VPL V
10
v SECS
0.02
-0.0
100
10
SECS
15
\
2111208R5.VRL H=0
OPS=RDC
20
0. t
10
SECS
15
2111208R6.VRL H=
90
OPS=RDC
0.0
2
0.0
1 0
-0.0
1
-0.0
2
I/
j- \- 1-
!4mt
flntai
UM*^
iii4k
^
, ,
1 ,
.
\
^ 'I .,
1 ....
1 ....
20
0.05
-0.05 100
0. I
10 sees
15
X
20
Figu
re A6
5. S
cale
d se
ismo
gram
s an
d sp
ectr
al ra
tios
of
event
on J
uly
29,
1985 (Julian
211)
at
12
:08
for
the
vertical,
horizontal (N-S a
nd E
-W)
components,
resp
ecti
vely
, of
stations
CBD/
VAL.
21U
208R
U.C
BE
V
OPS^
RDC
21
H2
08
R5
.CB
E
H=0
O
PS=H
DC
2U
1208R
G.C
BE
H
=90
2H
12
08
Rli.
VR
L
VoP
3--n
i)L
10
v SE
CS
0.02
-O.Oc
10
3ECS
2U
1208R
5.V
RL
H=0
0.02
O.U1
0
-0.0
1
-0.02
20
0.05
-0.05
2111208R6.VOL H=
90
OP5=RDC
10
SECS
X
10 SECS
1520
0.05
-0.0
5I
' I
I I I L
&* *
10 :-ccs
1520 20
100 ID n. i
-J-
o
100 to
300.
1
HZ10
20HZ
100 10
300. I
Figu
re A6
6. Sc
aled
se
ismo
gram
s an
d spectral ra
tios
of
event
on July 29,
1985 (J
ulia
n 211) at
12:08
for
the
vert
ical
, ho
rizo
ntal (N
-S an
d E-W) co
mpon
ents
, respectively,
of st
atio
ns C
BE/V
AL.
0.0
5
in i
0 o
-0.0
5 C2
U1208R
H.C
BB
V
OP
S=f
lOC
yL.
.H A
i
.II.JA
d If
HM
Wtil
5
ifflili
M Jilil M
l ill
blJl
L i «
L M
KIlifilff
l^^
. ,
i ,
, ,
, i
i10
15
v
SE
CS
X ******
, ,
, 1 20
2lll2
08R
ii.C
BR
V
0.01
4
0.02
0
-0.02
-O.OU
10 SEC:
1520
2U
12
0B
R5
.CB
B
H=
0 O
PS
=flD
C21U
208R
6.C
BB
H
=90
O
PS
=RD
C
0. 15 r
o. t
-O.t
- 2ltl208R5.CBfl H=0
OPS=
flDC
2ttt2
08
R6
.CB
fl
H=
90
OP
S=R
DC
0.0
5 0
-0.0
5
_n
i n
f (III,.
..
- ',.,,!,,
: ^$V
$f!^^
JIM
' '
V , ,
1 ,
, ,
, 1
, ,
, ,
110
3LC
S15
too 10
0.
1U
HZ
20
too
300.
I
too tO
r
0.
I30
Figu
re A67. S
cale
d se
ismo
gram
s an
d spectral ra
tios
of
even
t on J
uly
29,
1985
(Julian
211)
at
12:08
for
the
vertical,
horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, of st
atio
ns C
BB/CBA.
2111
208R
I4.C
BC
V
OPS
=RO
C21
1120
8R5.
CBC
H=0
OPS=
RDC
2111
208R
6.CB
C H=
90
OPS^
RDC
0. 1
5 r
21 11208RU.CBR V
OPS- nni
O.OU
0.02
0
2ttl
208R
5.CB
fl H=
OP3=
flUC
\
^^^
;' ^^Xl
(fte^*^^
10
5ECS
20-O.OU
2lll208R6.CBfl H=90
OPS-
flDC
0.0
5 0
-0.0
5
n i n
;/
-
"'' «
. L
i. i,fl
JW$^
^^i
,IM
!'
'If
10 3CCS
1520
too ID
0.10
20
100
30
10
1 r
0. 1
1020
HZ
100
300,
I
Figu
re A6
8. S
cale
d se
isin
ogra
ms and
spectral ra
tios
of ev
ent
on J
uly
29,
1985 (Julian
211)
at 12
:08
for
the
vert
ical
, ho
rizo
ntal
(N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, of
stations C
BC/C
BA.
2111
208R
U.CB
D V
OPS=
flDC
2111208R5.CBD
H=0
OPS=
flDC
2111208R6.CBD
H=90
ops=noc
21
11
20
8R
I1.C
BR
V
ors^not.
o.ou
0.02 0
-O.OU
10
SEC3
1520
2111208R5.CBR H=0
211 1208R6.CBR H=90
ors^noc
0,0
5 0
-0.0
5
-0.
10 C
s
H,fW
»*M
* -*
,,v
,
-
v1
'll ''
'
|! IJ ' 1"
______
5 10
15
2
too
lOO
lOOr
Figure A6
9. S
caled
seis
mogr
ams
and
spectral ratios o
f ev
ent
on J
uly
29,
1985
(J
ulia
n 211) at 12
:08
for
the
vertical,
horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, of stations C
BD/C
BA.
2tlt2
08
Rii.C
BE
V
OP
S=P
DC
2H
12
08
R5
.CB
E
H=
0 O
PS
^RO
C2t
tt20
8R6.
CBE
H=90
OPSrflDC
o.oi
i0
.02 0
-0.0
2
-O.O
ll
o.on
0.0
2 0
-0.0
2
-O.O
il
21
H2
08
Ril.
CB
fl
Vor
s-nn
c
10
SECS
1520
3=>
O
0. 1
\
10
SFC3
1520
1001
i
i i
i i
i i
i i
O.O
il
0.0
2 0
-0.0
2
-O.O
il
-0.0
6
r^\
2U
1208R
5.C
BR
H
=0
10
SECS
0.
01
0.0
2 0
-0.0
2
-0.0
14C
100
r/
10
0.
10
ECS
15 15
1020
HZ
\
0.05
-'
-0.0
5 -
20
2ttt200R6.CBR H=
90ors=nDC
20
0.0
5 0
-0.0
5
-0.
10 (
100
;
10
0. 1
30
20 30
Figure A7
0. S
cale
d seismograms
and
spec
tral
ra
tios
of ev
ent
on J
uly
29,
1985
(Julian
211) at
12
:08
for
the
vert
ical
, ho
rizo
ntal
(N-S a
nd f
r-W) co
mpon
ents
, re
spec
tive
ly,
of st
atio
ns C
BE/C
BA.
APPENDIX BVINA EXPERIMENT
SEISMOGRAMS, FODRIER AMPLITUDE SPECTRA AND SPECTRAL RATIOS
The objective of this appendix is to provide the seismograms, Fourier
amplitude spectras and spectral ratios related to the Vina experiments only.
Selected plots of data processed by C. Mueller and J. Watson are presented
herein.
The plots are organized as follows:
Event Type of Plot Figure(s)
2150204
2160657
2161006
2161857
2191002
SeismogramsFourier amplitude spectraSpectral ratios
Seismograms
Seismograms
SeismogramsFourier amplitude spectraSpectral ratio
SeismogramsFourier amplitude spectraSpectral ratio
B1-B3 B4-B9 B10-B14
B15-B17
B18-B20
B21-B23 B24-B28 B29-B32
B33-B35 B36-B38 B39-B40
B
RSGRF:28-OCT-85. PLOT DECIMflTED BY:2
2150204N4.VflL UP. 0.0
Note: All components of stationQCL triggered on the S-wave arrival; therefore a 15.4 second gap is left prior to aligning the S-waves.
o.ou
0.03
0.02
o.oi
215020454.QCL UP, 15.4
215020404.EflC UP, 0.0
2150204N4.HER UP, 0.0
2150204N4.YNE UP. 0.0
2150204N4.REN UP, 0.0
10 20 SECS
30
Figure Bl. Scaled seignograms for event 2150204 (vertical components)
B-l
RSGRF:28-OCT-85. PLOT DECIMflTED BY:2
0.06
0.04
0.02
^ H=0. 0.0
10 20 SECS
2150204S5.QCL H-0. 15.
215020405.EflC H=0. 0.0
2150204N5.HER H-0. 0.0
H=0, 0.0
215020UN5.REN H=0, 0.0
30
Figure B2. Scaled seismograms for event 2150204 (N-S components)
flSGRF: 6-NOV-85. PLOT DECIHflTED BY:2
0.06 -
O.OM -
z: o
0.02 -
~*vHij||^A^^
0 L
2150204N6.VFIL H*90. 0.0
215020456.QCL H=90. 15.4
215020yQ6.EflC H=90, 0.0
2150204N6.HER H=90, 0.0
215020yN6.YNE H=90, 0.0
2150204N6.REN H=90, 0.0
10 20 SECS
30
Figure B3. Scaled seismograms for event 2150204 (F-W components)"~ B-3
Figure B4. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.
B-4
O.OOT
0.00?
21502WS5.0CL M«0
I^Wf^l^^^
Figure B5. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and E-W) components, respectively, for station QCL.
R-S
Figure B6. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and B-W) components, respectively, for station EAC.
B-6
SO?0«NS HER H=0
Figure B7. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and F/-W) components, respectively, for station HER.
R-7
Figure B8. Time series and Fourier amplitude spectra of event on August 3, 19R5 (Julian 215) at 02:04 for the vertical, horizontal (N-S and E-W) components, respectively, for station YNE.
SI50?0»I«.«E« «
Figure R9. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and F-W) components, respectively, for station PEN.
_ _____ _ ___. _ _ _ _____
2150
20U
SI1
.QC
L V
OPS=
flDC
215020US5.QCL H=0
OPS=flDC
215020US6.QCL H=90
OPS=
flDC
DO i
O.OOH
0.00
2 0
-0.002
-O.OOil
0.00
2 0
-0.002
-O.O
Oil
10
2150
204N
I1.V
RL V
OPS=flOC
TIME:
0 =
15.5
SECS
,0ID
SECS
20 20
0.005
-O.O
OB
0 10
2150
201N
5.Vf
lL H=0
OPS=flOC
TIME
i 0
= 15.5
SECS
0.002
0.001 n
-0.0
01
-0.0
02
10SE
CS
20 20
\
0.005 0
-0.0
05
-0.010
O.OOil
0.002 0
-0.0
02
10215020UN6.VFIL H=90
OPS=flOC
TIMEs
0 =
15.5
SECS
10SE
CS
20 20
lOOi
i i
i i
i i
i i
0. 1
1020
lOOr-r
300. 1
HZ
100
0. 1
Figu
re B
IO.
Scal
ed se
ismo
grams
and
spec
tral
ra
tios
of
event
on A
ugus
t 3,
1985 (Julian
215)
at 0
2:04 fo
r th
e ve
rtic
al,
hori
zont
al (N
-S an
d F-
W) components,
resp
ecti
vely,
of stations Q
CL/VAL.
2l50
20liO
U.E
RC
V
OPS
=flD
C215020U05.ERC
H=0
OPS
=RD
C21
5020
1406
. ER
C
H=9
0 O
PS=f
lDC
-0.0
1
215020UNU.VRL
V OP
S=RD
C
SECS
CO I
-0.0
011
10
215020UN5.VHL
H=0
OPS=
RDC
20
0.02
O.OL
0
-0.01
-0.02
SECS
0 10
215020UN6.VRL H=90
OPS=flDC
SECS
20
SECS
SECS
SECS
100 10
1020
HZ30
100 10
1020
HZ30
100 10
0. I
1020
HZ30
Figu
re B
ll.
Scaled s
eismograms a
nd sp
ectr
al ra
tios
of
event
on A
ugust
3, 1985 (J
ulia
n 215) at 0
2:04 for
the
vertical,
horizontal (N-S and
E-W)
co
mpon
ents
, re
spec
tive
ly,
of s
tations
EAO/VAL.
215020UNU.HER V
OPS=
flDC
215020UN5.HER H=0
OPS=flDC
215020UN6.HER H=90
OPS=
flDC
CD ( »
no
0.0
05
21
50
20
liNH
.VR
L
V O
PS
=flD
C
0.0
02
r
-O.O
Oli 10
0 lOr
O.I
1020
HZ
10
15S
EC
S215020U
N5.V
RL
H=0
O
PS
=flD
C
lOOr
300. 1
10
15
SE
CS
20
0.0
1
215020iiN6,VRL H=90
OPS=
flOC
O.O
OU
r/
25
100 10
300. 1
1020
HZ30
Figu
re B
12.
Scal
ed s
eism
ogra
ms a
nd sp
ectr
al ra
tios
of
even
t on
August
3, 19
85 (J
ulia
n 215) at 0
2:04 for
the
vertical,
horizontal (N-S a
nd E
-W)
comp
onen
ts,
resp
ecti
vely
, of s
tati
ons
HER/
VAL.
2150
20UN
U.TN
E V
OPS=flDC
2150
20UN
5.TN
E H=0
OPS=
fiDC
2150
20UN
6.TN
E H=90
OPS=flDC
0,005
-0.005 -
2150
20UN
U.VR
L V
OPS=
HDC
-0
0 5
10
15SE
CS215020UN5.VRL
H=0
OPS=
flDC
10
15
SECS
io
isSE
CS21
5020
UN6.
VRL
H=90
OPS=
flOC
\
-0.0
02 -
100 10
0. 1
1020
HZ30
100 10
0. L
LO20
HZ30
0. L
Figu
re B
13.
Scal
ed se
ismo
grams
and
spectral ra
tios
of
even
t on
Aug
ust
3, 1985 (Julian
215)
at
02:
04 fo
r th
e ve
rtic
al,
horizont
al (N-S an
d E-W) co
mpon
ents
, respectively,
of st
atio
ns Y
NE/V
AL.
215020UNU.REN V
OPS=HOC
215020UN5.REN H=0
OPS=RDC
215020UN6.REN H«
90
OPS=
flDC
2150204NU.VRL V
OPS=flDC
10
15
SECS
2025
0.002
r
-0.0
04
0 5
10
15SE
CS2L5020UN5.VRL H=0
OPS=HDC
2025
1015
SECS
20
0 5
10
15SECS
2L5020UN6.VflL H=90
OPS=HDC
25
-0,0
02 -
20
tOOr-r-T-T-r-r-r-r-r-r
10
O.I
10
20HZ
100
30
10
0.1
1020
HZ
100
30
Figure B
14.
vScaled
seis
mogr
ams
and
spectral ratios o
f event on
Aug
ust
3, 1985 (J
ulia
n 215) at 0
2:04
for
the
vert
ical
, horizontal (N-R and
E-W)
components,
resp
ecti
vely
, of stations P
KN/VAL.
flSGRF: 8-NOV-85. PLOT OEClMflTED BY:2
O.OU r
0.03 -
enX 0.02 -
0.01 -
0 L
2160657m.VflL UP. 6.00
jj||^^
lftHfM<^^ UP, 0.0
2I60657JU.ELC UP, 0.0
*-2160657JU.HER UP, 0.0
2160657JU.YNE UP. 0.0
!|>||l^ 2160657JU.REN UP, 0.0
Note: All components of station VAL triggered on the S-wave arrival; therefore a 6 sec. "gap" is left prior to aligning the S-wave^ _____ .__ _.._ __
10 15 SECS
20 25
Figure B15. Scaled seismograms for event 2160657 (vertical components)
flSGRF: 8-NOV-85. PLOT DEClMflTED BY:2
0.05
0.04
0.03
0.02
0.01
10 15 SECS
20
2160657L5.VRL H-0. 6.00
H=0, 0.0
2160657J5.EMP H=0, 0.0
*H*2160657J5.HER H=0, 0.0
2160657J5.YNE H=0, 0.0
2160657J5.REN H=0, 0.0
25
Figure B16. Scaled seismograms for event 2160657 (N-S components) --- B-T6 "
RSGRF: 8-NOV-85. PLOT OECIMRTEO BT:2
0.05
0.04
0.03
in x2:
0.02
0.01
10 15 SECS
20
2160657L6.VflL H=90. 6.00
2160657J6.ELC H=90, 0.0
2160657J6.EMP H=90, 0.0
2160657J6.HER H=90, 0.0
2160657J6.TNE H=90, 0.0
2160657J6.REN H=90, 0.0
25
Figure B17. Scaled seismograms for event 2160657 (E-W components)
B-17
flSGRF:28-OCT-85. PLOT DECIMflTED BY:2
2161006F4.VRL UP. 0.0
'2161006G4.HER UP. 0.0
2161006F4.YNE UP. 0.0
0.020 r
0.015 -
0.010 -
0.005 - I
0 L
10 15 SECS
20
2161006FIJ.REN UP. 0.0
25
Figure B18. Scaled seismograms for event 2161006 (vertical components)
B-18
flSGRF:28-0CT-85. PLOT DECIMflTED BY:2
2161006F5.VRL H=0. 0.0
0.020 r
0.015 -
0.010 -
0.005 -
0 L
2161006G5.HER H=0, 0.0
2161006F5.YNE H=0. 0.0
61006F5.REN H=0. 0.0
10 * 15 SECS
20 25
Figure B19. Scaled seismograms for event 2161006 (N-S components)
flSGRF: 7-NOV-85. PLOT DEClMflTED BY:2
2161006F6.VRL H=90. 0.0
0.020 r
0.015 -
0.010 -
0.005 -
0 L
2161006G6.HER H=90. 0.0
2161006F6.YNE H=90. 0.0
2161006F6.REN H-90. 0.0
10 15 20 25 SECS
Figure B20. Scaled seismograms for event 2161006 (E-W components)
ftSGRFs22-0CT-85. PLOT DECIHflTED BT:2
UP, 0.0
216l857G«.HUN UP. 0.0
216i857GH.EflC UP. 0.0
2161857GH.TRR UP, 0.0
216I857GH.REN UP. 0.0
10 15 20 25 SECS
Figure B21. Scaled seismograms for event 2161857 (vertical components)
B-21
RSGRF:22-OCT-85. PLOT DECIMflTED BY:2
0.06
o.oyCO
ac <_)
0.02
I
" 216l857F5.Vfll_ H=0. 0.0
2161857G5.MUN H=0, 0.0
=0 ' 0.0
2161857G5.TRfl H=0. 0.0
2161857G5.REN H=0. 0.0
10 15 20 25 SECS
Figure B22. Scaled seisinograms for event 2161857 (N-S components)
B-22
flSGRF:24-0CT-85. PLOT DECIMRTED BY:2
0.08
0.06
0.02
1
^^-w% -2161857F6.VRL H=90. -1.90
2161857G6.MUN H=90. -1.90
2161857G6.ERC H=90. -1.90
Note: Because of a timing "glitch" at 1.8 sec of the records - -- of station EAC, plots were corrected by skipping into the
trace by 1.9 seconds. ___________ _.__ __
2161857G6.TRfl H=90. -1.90
12161857G6.REN H=90, -1.90
10 15 SECS
20 25
Figure B23. Scaled seianograms for event 2161857 (N-S components)
B-23
lfl^^^ "
Figure B24. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.
B-24
(1857C5 MIW H-0
Figure B25. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station MUN.
B-25
Figure B26. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station EAC.
Figure B27. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station TRA.
B-27
Figure B28. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station REN.
R-?8
2161857GU.MUN
V OP
S=HD
C2161857G5.MUN
H=0
OPS=
HDC
2161
857G
6.MU
N H=
90
OPS=
HOC
2161857FU.VRL V
OPS=RDC
10
15
SECS
2025
0.005
-
-0.0
05 -
CO ro
vo
100 10
0. 1
5 10
15
SECS
2161857F5.VRL H=0
OPS=RDC
0.0
05
i-
-0.0
05
-
100 10
1020
30
0. 1
1020
HZ
HZ
20
0.02
-0.0
2
0 5
10
15SECS
2161857F6.VRL H=
90
OPS=RDC
20
0.005
-/
-0.0
05 10
0 I0r I -
300.
I
25 \
20
25
1020
30HZ
Figu
re R
29.
Scaled s
eismograms a
nd s
pectral
rati
os o
f ev
ent
on A
ugus
t 4,
19
85 (Julian
216) at
18:57 for
the
vertical,
horizontal (N-S a
nd E-
W) co
mpon
ents
, respectively,
of stations M
UN/VAL.
03 I GO O
g
-0.0
05 -
100 10
SECS
lOOl
I
102D
30HZ
100 10
0.1'
'
' '
'30
0. 1
1020
30HZ
Figu
re R
30.
Scaled s
eismograms a
nd sp
ectr
al ratios o
f ev
ent
on A
ugus
t 4, 19
85 (Julian
216) at
18:
57 for
the
vert
ical
, ho
rizo
ntal
(N-S a
nd E
-W)
comp
onen
ts,
respectively,
of stations E
AC/V
AI,.
2161857GH.TRR
V OP
S=fl
DC2161857G5.TRn
H=0
OPS=
flDC
2t61857G6.TRn
H=90
OPS=flDC
2l6l857FU.VflL
V
GPS=RDC
10
15SE
CS2161857F5.VRL H=0
OPS=
flDC
0.005
-
CD
I 00
-0.0
05 -
0.005
-0.005
10
15
SECS
20
\0.02 r
-0.0
1 -
0 5
10
15SECS
2161857F6.VHL
H=90
OP
S=PO
C
0.00
5 -/
20
Lj 25
-0.0
05
100 to
1020
HZ30
100 to
0. 1
1020
HZ30
100 10
0.1
10
20
HZ30
Figu
re R
31.
Scal
ed se
ismo
gram
s an
d sp
ectr
al ra
tios
of
event
on A
ugus
t 4, 1985 (Julian
?16)
at 18:57
for
the
vert
ical
, ho
rizo
ntal (N-S an
d F-
W) co
mpon
ents
, respectively,
of st
atio
ns T
PA/V
AT,.
2161
857G
U.RE
N V
OPS=
flDC
2161857G5.REN
H=0
OPS=
HDC
2161
857G
6.RE
N H=
90
OPS=
RDC
0.01
-o.ot
2161857FH.VRL
V OP
S=RD
C
10
15
SECS
0.00
5
-0.0
05
-
OJ ro
too 10
0. 1
10
15
SECS
1020
HZ
X0.02
c-
0.01
-
-O.O
t -
2025
D 5
10
15SECS
2161857F5.VRL
H=0
OPS=
flOC
0.005 r
-0.0
05 -
2025
too 10
300. 1
10
20
HZ
10
15SECS
2161
857F
5.VB
L H=0
OPS=
RDC
0.0
05
r
-0.0
05 to
o 10
300.
I1
' '
'
10
15
SEC
S
1020
HZ
20
25
X ,_! 25 30
Figure R
32.
Scal
ed s
eism
ogra
ms a
nd s
pect
ral
ratios o
f ev
ent
on A
ugus
t 4,
19«5 (Julian
216) at
18:
57 for
the
vertical,
horizontal (N-S a
nd F-
W) components,
respectively,
of stations P
FN/VAL.
PSGflF:10-SEP-85. PLOT DECIMflTED BT:«
0.3
0.2
V)
cO
0.1
ll^jflfyft^ 2191002FH.VRL UP. 0.0
2191002GU.TRR UP. 0.0
10
2191002GU.MUN UP. 0.0
30SECS
Figure B33. Scaled seismograms for event 2191002 (vertical components)
B-33
f»SGRFtlO-SEP-85. PLOT DECIMflTED BY:U
^-2191002F5.VRL H*0. 0.0
0.5
0.3
2191002G5.TRR H=0, 0.0
CO s,ac o
0.2
0.1
2191002G5.MUN H=0. 0.0
10 20 SECS
30
Figure B34. Scaled seismograms for event 2191002 (N-S components)
B-34
RSGRFilO-SEP-85. PLOT DECIHBTED
»^^ -2l9lOff2F6.VflL H«90, 0.0
0.5
0.4
0.3
enXc_>
0.2
0.1
2191002G6.TRR H-90, 0.0
10 20 SECS
2191002G6.MUN H=90. 0.0
30
Figure B35. Scaled seismograms for event 2191002 (B-W components)
Figure B36. Time series and Fourier amplitude spectra of event on August 7, 1985 (Julian 219) at 10:02 for the vertical, horizontal (N-S and T5-W) components, respectively, for station VAL.
B-36
Figure B37. Time series and Fourier amplitude spectra of event on August 7F^ <S±1?19) " 1Cl:0!? ,far the Vertica] ' «wri«ntaj ^-f and R-W) components, respectively, for station WW."~'~
Figure B38. Time series and Fourier amplitude spectra of event on August 7, 1985 (Julian 219) at 10:02 for the vertical, horizontal (N-S and E-W) components, respectively, for station TPA.
B-38
2191002GU.MUN V
"DPS
=ROC
2191002G5.MUN H=0
OPS=flOC
2191002G6.MUN ht=90
OPS=POC
0.05
-0.05
2l9
t002F
ii.V
flL
V O
PS
=PD
C
CO
I OJ
O.D2
-0.02
10
ISSE
CS2l
9t00
2F5.
VflL
H=0
OPS=POC
lll^^
10
15
SECS
2025
0.01
0
-0.01
10
15
SECS
20 20
25 25
0.05
-0.05
- 0 5
10
15SECS
2191002F6.VRL H=
90
OPS=flOC
0.02
-0.02
10
15
SECS
20 2025
100 10
0. 1
" '
' '
'10
HZ20
30
100 10
toHZ
2030
tOOr
-r
Figu
re R
39.
Scaled s
eism
ogra
ms a
nd s
pectral
ratios o
f ev
ent
on A
ugus
t 7, 19
85 (J
ulia
n 21
9) at
10:02
for
the
vert
ical
, ho
rizo
ntal
(N-vS and
F-W) co
mpon
ents
, re
spec
tive
ly,
of st
atio
ns M
ITN/
VAL.
2191002GU.TRR V
OPS=flDC
2191002G5.TRR H=0
OPS=RDC
2191002G6.TRR "H=90
OPS=
flDC
o.o a
0.02
-0.02
2191
002F
I1.V
RL V
OPS=flOC
10
15
SECS
0.02
-0.02
2025
ll^
10
15
SECS
2025
0.05
-0.05
5 10
, 15
SECS
2191002F5.VRL H=0
OPS=
flDC
0.01 -
-0.0
1 r
2025
o.ou
0.02
0
-0.0
2
-0.0
1
0 5
10
15SECS
2l91002F6.VflL H=90
OPS=fiOC
0.02
-0.0
2
10
15
SECS
20 20
25 25
LOO 10
O.I
1020
HZ
100
30
10
0. 1
10HZ
2030
0. I
Figure MO.
Scaled s
eismograms a
nd spectral ratios o
f ev
ent
on A
ugust
7, 19
85 (Julian
219) at
10:02 fo
r the
vort
ical
, ho
rizo
ntal
(N-R and
K-W) co
mpon
ents
, re
spec
tive
ly,
of stations T
PA/VAL.