rp-1-oc-71; northeast pacific geophysical survey 31 march - 26 june, 1971 40· figure 1. pol...

U.S. DEPARTMENT OF COMMERCEPeter G. Peterson, Secretary

NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

Robert M. White, Administrator

ENVIRONMENTAL RESEARCH LABORATORIES

Wilmot N. Hess, Director

NOAA TECHNICAL REPORT ERl 232-POl 10

RP-l-0C-71Northeast Pacific Geophysical Survey

H. R. STEVENS, JR.

BOULDER, COLO.January 1972

For sale by the Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. 20402Price $1.00

TABLE OF CONTENTS

ABSTRACT1. INTRODUCTION2. CHRONOLOGY3. NAVIGATION CONTROL4. INSTRUMENTATION/EQUIPMENT

4.1 Sounding Equipment4.2 Magnetics4.3 Gravity4.4 Seismic Profiling

5. DATA ACQUISITION AND PROCESSING5.1 Shipboard Data Processing5.2 POL Data Processing

6. DISCUSSION OF PRELIMINARY RESULTS6.1 Leg I Seattle - Honolulu6.2 Leg II Honolulu - Kodiak6.3 Leg III Kodiak - Sitka6.4 Leg IV Sitka - Seattle

7. PRESENTATION OF PROFILE8. ACKNOWLEDGEMENTS9. REFERENCESAPPENDIX A Scientific PersonnelAPPENDIX B Summary of Special ProjectsAPPENDIX C Summary of Underway OperationsAPPENDIX D Base Tie Summary

iii

Page1

1

3

8

8

889

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11

1112

13

1314141 5

1686

86

87

88

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91

LIST OF FIGURESPage

Figure 1 POL Geophysical Survey Track 2

Figure 2 Leg I Seattle - Honolulu 4

Figure 3 Leg I I Honolulu - Kodiak 5

Figure 4 Leg I I I Kodiak - Sitka 6

Figure 5 Leg IV Sitka - Seattle 7

Figure 6 Seattle - Honolulu - Location Index 1 7

Figure 7 Honolulu - Kodiak - Location Index 47

Figure 8 Kodiak - Sitka - Location Index 67

Figure 9 Sitka - Seattle - Location Index 77

i v

RP-1-0C-71 NORTHEAST PACIFIC GEOPHYSICAL SURVEY

H. R. Stevens, Jr.

This report summarizes the work undertakenby scientific personnel aboard the NOAA ShipOCEANOGRAPHER in the spring of 1971. Over17,000 nautical miles of bathymetry, magnetic,and gravity data were recorded during thecruise. From this data a profile of magneticand gravity anomalies with related bathymetryhas been produced. A major part of the work involved continuous seismic profiling. From thisrecord and the other geophysical measurementsadditional information pertaining to the oceaniccrust in the Northeast Pacific OCean has beenacquired. Four separate regions were investigated. They were a region of abyssal hillsbetween the Murray and Mendocino fracture zones,the Chinook trough, the northern Gulf of Alaska,and the Queen Charlotte Islands fracture zone.

1. INTRODUCTION

During the months of March-June 1971 a scientific party from the

NOAA Pacific OCeanographic Laboratories conducted a geophysical survey

while aboard the National Ocean Survey Ship OCEANOGRAPHER. The fundamen

tal purpose of this project {RP-1-0C-7l} was to obtain geophysical data

that bears on the origin and development of the oceanic crust in this

region. A generally accepted theory of plate tectonics holds that the

northeast Pacific basin is part of a large rigid crustal plate presently

mOVing in a northwesterly direction and underthrusting the eastern

Aleutian arc and Alaska continental margin {see figs. 1-5}.

6o.1-------~~~;:;~~~~~~~~~d:~-----160·

DREDGE STATION. 200 N140· 120·W

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Fig 1 POL Geophysical Survey Track

RP- 1- OC-71

31 March - 26 June, 1971

40·

Figure 1. POL Geophysical Survey TracK

The four survey areas were selected with specific objectives in

mind. That for Leg I was to examine a region of abyssal hills between

the Murray and Mendocino fracture zones northeast of the Hawaiian Islands.

This was an attempt to delineate the topographic grain in an area where

linear magnetic anomalies, of the type associated with sea floor spread

ing, exists and also within an area void of magnetic lineations.

2

The Chinook trough appears to mark the southern limit of an

ancient small crustal plate that broke away in a northerly direction from

the main Pacific plate. The objectives of Leg II were to locate precise

ly the termination of the Chinook trough and also to delineate the

volcanic structure beneath the abyssal Aleutian plain. An examination

of local turbidite phenomena was accomplished concurrently.

The investigation of fracture zones, magnetic anomalies, and

sedimentary strata in the northern Gulf of Alaska was the major objective

of work done on Leg III. Of special interest was the oceanic crustal

structure along the continental margin. A special two-day gravity survey

in She1ikof Strait and lower Cook Inlet was conducted during this phase

of the work.

A seismic reflection survey of the Queen Charlotte Island fracture

zone and the bathymetric development and dredging of four seamounts to

the west comprised the work done on Leg IV.

Several additional projects. summarized in Appendix B. were a

part of the overall scientific program conducted aboard ship.

2. CHRONOLOGY

The cruise was divided into four Legs:

I. Seattle to Honolulu - 31 March to 28 April

II. Honolulu to Kodiak - 4 May to 27 May

III. Kodiak to Sitka - 1 June to 12 June

IV. Sitka to Seattle - 13 June to 26 June

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Trackline Distance (n. miles) 16217.2- 18114.2

Pages 79 -86

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Figure 5. Leg IV Sitka - Seattle

7

3. NAVIGATION CONTROL

Except when operating close to shore where radar and visual fixes

were used. most of the trackline was controlled by an AN/SR-9 Satellite

System which was supplemented by loran A and C.

The Cape Flattery gravity range was run prior to start of the

leg I trackline and again after completion of leg IV. A Decca Seafix

system was used for position control during the first run of the gravity

range and Satellite Navigation used on the last run.

Refinement of navigational data is discussed in section 5.

DATA ACQUISITION AND PROCESSING.

4. INSTRUMENTATION/EQUIPMENT

4.1 Sounding Equipment

Three transceivers and two depth recorders were used to obtain

12 kilohertz bathymetric data. The transceivers were two Edo Model 248A

units and a Raytheon PTR Model 105. Sounding traces were recorded on Edo

Model 33A Precision Bottom Recorders.

4.2 Magnetics

A Varian V4937 Proton Precession Magnetometer was towed at a

cable length of 700 feet. Total field magnetic intensities were continually

recorded on analog tape at six inches per hour and were also logged on

punch paper tape at five minute intervals.

8

It will be noted that the profiled magnetic values are indicated

as being negative throughout Leg I and part of Leg II. As the ship pro

gressed northward from about 4l o N Latitude and l59°W Longitude positive

values appear on the profile with increasing frequency. Magnetic values

obtained on Legs III and IV are almost entirely positive. The apparent

gradual shift of the profile's zero reference line is due to the inexact

fit of the IGRF standard with the actual regional field.

4.3 Gravity

The gravity meter used aboard the OCEANOGRAPHER was an Askania

GSS2, number 22. The gravity data were recorded continuously by analog

trace and at five minute intervals on punch paper tape.

Cross-coupling error is basically the product of both horizontal

and vertical accelerations, caused by ship motion, acting upon a beam

type gravimeter. In order to avert the effects of these large vertical

accelerations the beam of the Askania meter is first magnetically dampened.

Any deflection of the beam from the horizontal position is then detected

by photocell sensors and signals are then sent through a series of RC

filters to a servo mechanism. This motor makes the necessary screw

adjustments that control spring tension and the beam is restored to the

horizontal position. Because there is a delay in readjustment the beam

is out of horizontal position during the period of wave motion and

deflections occur when horizontal accelerations act on it to produce a

resultant vertical acceleration which is indistinguishable from that of

9

gravity. This is known as cross-coupling error. The problem is to remove

this induced error from the gravimeter record.

Although cross-coupling meters are commercially available budget

ary considerations precluded the purchase of one for project RP-l-OC-71.

For this reason an instrument was developed by two members of the NOAA

Commissioned Corps to detect the cross-coupllng effect and compute the

correction values to be used in data reduction. Cost of materials for

this instrument was approximately $250. The ship's gravity officer,

LTJG Carl A. Pearson defined the general performance requirements of the

instrument. rhe circuit design and construction of the cross-coupling

computer is credited to LTJG Thomas E. Brown. electronics officer of the

OCEANOGRAPHER. ATexas Instrument Analog Recorder was used in conjunction

with the computer.

4.4 Seismic Profiling

Except for the Aquadyne hydrophone streamer and the sparker equip

ment belonging to POL the other instrumentation was on loan from the

University of Washington. Equipment used is listed below:

Bolt 40 cubic inch air gun

Rix K-44 air compressor

Sparker array (POL manufacture)

Del sparker power unit (105 - 3 kjoule)

2 LM hydrophone streamers (Univ. of Wash. manufacture)

Aquadyne hydrophone streamer

10

Edo PBR Recorder Model 333-11

Del Norte Technology Inc. amplifier, Model 501

The Bolt air gun produces acoustic energy by the sudden release

of air at a pressure of 2000 psi. The reflected signals from the sea

floor are picked up by the hydrophone streamer and amplified and filtered

between 35-70 Hz before being recorded on the Edo unit at a 4 second sweep.

The sparker produces acoustic energy by discharging a capacitor

bank through multiple electrodes. Signal returns were generally filtered

between 60 and 600 Hz and recorded at a 1 second sweep. The air gun

generally was used when operating in depths exceeding 400 fathoms and the

sparker for shoaler depths. The hydrophone streamer was towed at a dis

tance of approximately 400 feet. At speeds over 9.5 knots excessive

stress was produced on the towed equipment and the air gun towing behavior

tended to be erratic when certain combinations of speed and sea state

were encountered.

5. DATA ACQUISITION AND PROCESSING

Processing of acquired data was done aboard ship and ashore. The

reduction of raw data to finalized forms reQuired a number of distinct

processing operations, data checks, and corrective procedures.

5.1 Shipboard Data Processing

Three primary output products resulted from shipboard data reduc

tion. Two were punched paper tapes, the Edited Data Tape and the Control

Tape. These tapes were processed together to produce the Geophysical

Report which is a final listing of the processed data.

11

The Edited Data Tape contains corrected time, depth, magnetic,

and gravity values. Preparation of the Edited Data Tape requires that

underway time, depth, magnetics, and gravity data be recorded on punch

paper tape at selected time intervals by a Raw Data logger. RDL tape

is translated to a Raw Data Tape on which time sequences are rearranged

to account for the inherent five minute delay in gravity values and manual

depth entries. The printout of this tape is checked against fathograms

and analog records for any error or omission and a Correction Tape is

prepared. Two other tapes are employed to make up the Edited Data Tape.

The Shaft Tape records gravimeter shaft encoder corrections and the cross

coupling corrections. The Status Tape logs periods when the gravimeter

is not in operation. These tapes are processed together with the Raw

Data Tape and the Correction Tape to produce the Edited Data Tape.

The Control Tape contains time, course, speed, and position data

with the computed values of the International Geomagnetic Reference Field

(IGRF). Preparation of the Control Tape is the result of several process

ing procedures. Information from the smooth plotted Boat Sheet is

recorded on a Position Tape. From this tape a listing is produced of ship

course and speed between positions. Detected errors are corrected and the

Control Tape is made from the revised listing.

5.2 POL Data Processing

Data processing is not finalized aboard ship but is completed at

the Pacific Oceanographic Laboratories and at the University of Washington

Computer Center.

12

POL uses an IBM 1620 to transfer to cards the information which

is on the Edited Data Tape and the Control Tape. After listing, the cards

are checked for time sequence and the navigation data is reviewed. If

all is in order the deck is then programmed to place card data on a mag

netic tape. This transfer is made at the University of Washington using

the CDC 6400 system. Information on the magnetic tape is then programmed

to produce a profile of magnetic and gravity anomalies, bathymetry, and

positioning. A visual inspection of this profile indicates final correc

tions which are made directly on the magnetic tape.

6. DISCUSSION OF PRELIMINARY RESULTS

6.1 Leg I

The abyssal hills in this survey area were shown to be lineated

in a direction parallel to the linear magnetic anomalies. This alignment

suggests that the topographic grain remains as initially formed by crustal

generation. A portion of the survey area also extended into the magnetic

quiet zone, a region where the crust is believed to have been generated

during a period when the earth's magnetic field did not reverse polarity.

Here, also, the abyssal hills were lineated in a direction consistent

with an origin due to sea floor spreading, that is, at right angles to

the nearby fracture zones.

The abyssal hills exhibit a degree of banding based on variations

in the topographic relief. Relief banding paralleling linear magnetic

anomalies occurs in an abyssal hill region of similar age south of

the Aleutian trench. The relief characteristics of these bands,

13

however. cannot be related on an anomaly to anomaly basis from one region

to the other. This suggests that the banding is a local phenomenon.

6.2 Leg II

The eastern termination of the Chinook trough was located at

approximately 45°N and 165°W. This position is within 15 miles of tha~

predicted by plate theory. The subbottom topographic expression of the

magnetic bight was evidenced only in a reorientation of the abyssal hills

with no obvious evidence of fracturing found associated with it. This

reorientation of the abyssal hills was used to locate the bight at one

location within the quiet zone.

6.3 Leg III

The gravity readings in Shelikof Strait and immediately to the

north and northeast of Kodiak Island are of special interest. The Free

Air and Bouguer anomalies are noticeably different from those found else

where along the entire trackline. See the Profile of Leg 3. figure 4,

pages 69 to 71. Crustal irregularities beneath the thick sedimentary

deposits are reflected in the Free Air anomalies which range in this

region from -45 mgals to 66 mgals. The profile of the Bouguer values,

-29 mgals to +56 mgals. presents a unique pattern because these values

closely parallel the Free Air profile. The low positive and negative

Bouguer values are attributed to the relatively shallow shelf depth which

is generally well under 200 meters.

The CSP system was operated over two of the lines in the Strait

and showed two different sedimentary units separated by an angular unconformity.

14

The upper unit is underformed and mostly flat-lying with few internal

reflectors. The lower unit is well-stratified and shows evidence of

structural deformation followed by erosion. In places the acoustic base

ment is at or near the sea floor with very little sediment cover.

On the continental shelf at the northern end of the Gulf of

Alaska. numerous truncated and folded reflectors are evident in a relative

ly thick sedimentary section. An apparent fault scarp is exposed at the

sea floor near Middleton Island. perhaps related to the 1964 Alaskan

earthquake.

CSP lines were run in the Gulf of Alaska basin during both Legs

III and IV. The great thickness of stratified sediments obscured the

basement. making it difficult to arrive at any conclusions regarding the

fracture zone locations without additional interpretation of the CSP

records. Disturbed turbidites overlain by flat lying turbidites suggests

that a period of deformation. perhaps in Late Tertiary. was followed by

a second period of quiescence throughout the Gulf of Alaska.

6.4 Leg IV

On the continental shelf near Sitka the CSP data show that sedi-

mentary structure near shore dip steeply seaward. A broad syncline is

present between the shore and the outer edge of the shelf. The sediments

are very thick and appear to be ponded behind a damming ridge at the shelf

break. North and south of Sitka. the sediments are very stratified with

some faulting and appear to dip seaward with little evidence of any

tectonic dam. Because of the complexity of the sedimentary structureadditional interpretation of the data is necessary before any conclusions

regarding the Queen Charlotte Fracture Zone are attempted.

15

7. PRESENTATION OF THE PROFILE

A profile and a print-out are the finalized forms of POL geophy

sical data reduction and processing. The profile. a product of a CalComp

plotter is presented with this report.

The chief advantage of a profile is that it permits a rapid

inspection of the processed data and ready recognition of geophysical re

lationships and anomalies. In short. a profile is an aid in evaluating

the results of the work undertaken. Its features may also suggest that

further development of a given area is warranted.

Other RP-l-OC-71 data which may be of special interest can be

obtained by writing to:

National Oceanic and Atmospheric AdministrationEnvironmental Data ServiceNational Geophysical Data CenterChief. Marine Geophysics GroupGramax Building. 8060 13th StreetSilver Spring. Maryland 20910

In descending order on each page are the profiles of the Magnetic

Anomaly. Free Air Anomaly. Bathymetry. and Bouguer Anomaly. Appropriate

scales are found at frequent intervals throughout the profile sections.

The CalComp plotter has also printed. in conjunction with the four pro

files. the distance traveled in nautical miles. course changes. and the

ship's position. Latitude and longitude are indicated at the half-tic

marks and the full tic marks denote position fixes.

Positions or areas of interest on the trackline charts (figures

1-5)may be quickly located in the four profile sections with the aid of

the four Location Indices.

16

FIGURE 6

LOCATION INDEX

Leg I SEATTLE - HONOLULU (See Figure 2)

Distance in n miles Degrees Degrees Pagesalong track Lat Long Lat Long

0 to 500.1 36.91 - 125.03 to 34.35 - 133.64 20 - 21500.1 to 1000.1 34.35 - 133.64 to 32.75 - 143.45 21 - 23

1000.1 to 1500.6 32.75 - 143.45 to 31.08 - 153.08 23 - 251500.6 to 2000.4 3'1.08 - 153.08 to 34.45 - 149.16 25 - 262000.4 to 2500.3 34.45 - 149.16 to 36.14 - 139.16 26 - 282500.3 to 3000.0 36.14 - 139.16 to 34.29 - 142.79 28 - 293000.0 to 3500.6 34.29 - 142.79 to 32.65 - 152.60 29 - 313500.6 to 3999.9 32.65 - 152.60 to 34.22 - 144.40 31 - 323999.9 to 4499.9 34.22 - 144.40 to 32.86 - 153.38 32 - 344499.9 to 4999.6 32.86 - 153.38 to 34.74 - 144.30 34 - 354999.6 to 5501.1 34.74 - 144.30 to 33.45 - 152.94 35 - 395501 •1 to 6000.3 33.45 - 152.94 to 34.93 - 145.13 39 - 406000.3 to 6500.1 34.93 - 145. 13 to 32.54 - 152.39 40 - 426500.1 to 6999.4 32.54 - 152.39 to 34.18 - 142.62 42 - 436999.4 to 7499.4 34. 18 - 142.62 to 29.24 - 143.46 43 - 457499.4 to 8000.4 29.24 - 143.46 to 27.54 - 152.75 45 - 468000.5 to 8570.4 27.54 - 152.75 to 22.03 - 157.23 46 - 48

Developed Area: Abyssal Hills

1715.1 to 6999.4 33.48 - 154.75 to 34. 18 - 142. 62 25 - 43

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65 69200

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65

I I'

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64

, .46

FIGURE 7

LOCATION INDEX

Leg II HONOLULU - KODIAK (See Figure 3)

Distance in n miles Degrees Degrees Pagesalong track Lat Long Lat Long

8628.3 to 9099.7 21.81 - 158.18 to 29.67 - 158.16 50 - 519099.7 to 9599.3 29.67 - 158.16 to 38.00 - 158.18 51 - 539599.3 to 10100.3 38.00 - 158.18 to 40.40 - 164.93 53 - 55

101 00.3 to 10600.5 40.40 - 164.93 to 45.11 - 168.98 55 - 5610600.5 to 11 099. 9 45. 11 - 168. 98 to 44. 71 - 165.50 56 - 5811 099.9 to 11600.0 44.71 - 165.50 to 44.78 - 166.21 58 - 5911600.0 to 12100.3 44.78 - 166.21 to 48.84 - 160.57 59 - 6112100.3 to 12600.2 48.84 - 160.57 to 52.82 - 157.79 61 - 6312600.2 to 13100.0 52.82 - 157.79 to 55.94 - 153.36 63 - 6513100.0 to 13590.6 55.94 - 153.36 to 57.21 - 151.40 65 - 67

Developed Area: Chi nook Trough

10807.7 to 11795.6 47.59 - 167.51 to 47.10 - 165.01 57 - 60

47

RP-1-0C -71Fig.7

400>---ILL.

~2§c-2-~

U'J 0u~-z:I--Z:

4J~~~2z:- -400

0

U'Ja::I.&J 2000 \I--I.&Jz:

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4000I--a...4JCl

6000

I I

66OISfl=lNCE

67 6IN Nl=IUTICl=IL MILES

~I

7103

!! ~"!

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::II G f: ~--I I I'. I

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48

RP-1-0C-71Fig. 7

I I I6 59 90 91

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~ ~ ~ ~ ~ !

1C II: (; ~ J •" I I I I , I I I '. L

49

RP-1- OC-71Fig. 7

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9:3 94

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50

RP-1-0C-71Fig 7

2000

4000

-100

300

95 96200

97

100

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51

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96 99 100

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RP-1-0C-71Fig 7

• I I14 lOS 106 107

I I nJ" II ii Ii • Ii! ! ! ! i !

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55

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2000

4000

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RP-1-0C-71Fig. 7

6000-\or- ,...- -_~__----

400

300

200

III 112 113

~s ~ q

~I; r=... ... ... ! !- ~ ~ ~ I;-

! "= Ie I; • I; Iea-t: !~

56

RP-1-0C-71Fig. 7

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114 115I

116

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I I 'I' '.. , ~ =I I' • I I .... i I I 'I

57

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RP-1-0C-71Fig. 7

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117 116 119 121

n

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121 122OI6T~NCE IN N~UTIC~L MILES

1

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a e~ ~wilt.-.

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60

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4000

6000 400

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127

300

200

25 129

100

r: t: t; (; ~ ~;;

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62

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WI IS IIc: !- IiWI

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63

132

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r

13:9 134

RP-1-0C-71Fig 7

I I

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64

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-100 0::LL

400

---UJ(30)

300 i>--.J«2:

200 0136 Z

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(9::)

0m

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65

Leg III KODIAK - SITKA

FIGURE 8

LOCATION INDEX

(See Figure 4)

Distance in n miles Degrees Degreesalong track Lat Long Lat Long

13643.3 to 13999.9 58.04 - 151.88 to 57.39 • 155.7313999.9 to 14600.3 57.39 - 155.73 to 55.24 • 145.1014600.3 to 15099.8 55.24 - 145.10 to 58.80 • 147.6115099.8 to 15600.2 58.80 - 147.61 to 59.62 • 148.5215600.2 to 16185.6 59.62 - 148.52 to 56.93 - 135.64

Developed Area: She11kof Strait

13684.3 to 14274.3 58.41 - 151. 62 to 58.84 - 151.61

67

Pages

69 - 7070 - 7272 - 7373 - 7575 - 77

69 - 71

RP-1-0C -71Fig.8

400 ->- ............J ......

~25c-z-'I:

U') 0W'I:-z:_z:LL.I~~q:zz: ..... -400

0

U')a:::l.J.J 2000l--l.J.Jz:Z-z:

4000l--dol.J.JCJ

6000

a J!15 ~

~....:_1_1----+---II;I--..&.t['\;iI--~!J_l:~..-=~:IItt:I~;,.;;;;..__

136 137OIST~NCE IN N~UTIC~L MILES

LJ1

68

RP-1-0C-71Fig. 8

36

Jl----l(

139

1.,-~ _

140I

141

69

142

I L,'------_

70

RP-1-0C -71Fig. 8

RP-1-0C-71Fig. 8

145 146 147

r;~

I. !!!: ~ ~ t:..~

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~ . Ii ~ II &:" -:I

~ t;; !: II! ~ s: !: t;;I I I I I' II I I i I I I I ~ I f f t I I I , I II I, I I I Illi I I I I I I .' ~

I i

71

4000

6000 400

300

RP-1-0C-71Fig. 8

150

100

~ ~ ... ... '! 5; '! ... col'! II! II! II! II!

G ~ l: l: e: e: III III III e:~ ~ s: I: ~ : ~ I;e: ~ ~- 0

~ ~..72

RP-1-0C -71Fig 8

~1

..I' , I J I I

152

e ~I 11 I I I' I I I !

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73

I I!

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153

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54

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155

1-'-1 I i I

74

I"

156

1 I I •:I

I t· 'I '.11 I I I lilli', I

RP-1-0C-71Fig. 8

7~'----....... ./'-I--::-;:--I--::::-"'"-----~

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156 159 160

~ ISI I I I ..... ..J t I '-til

- ~c::~I;

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75

...!! -....:"II -...- ...~ 1Jl~

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2:oz''"''<{ (J)

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--~::ffi:i~-------------l-~ 200162

I I I

76

Leg IV SITKA - SEATTLE

FIGURE 9

LOCATION INDEX

(See Figure 5)

Distance in n miles Degrees Degreesalong track Lat Long Lat Long

16217.2 to 16699.9 57.38 - 135.96 to 53.98 - 141.0816699.9 to 17199.9 53.98 - 141.08 to 53.48 - 136.7817199.9 to 17700.4 53.48 - 136.78 to 53.87 - 133.7517700.4 to 18114.2 53.87 - 133.75 to 51.84 - 130.29

Developed Area: Seamounts

Pages

79 - 8080 - 8383 - 8585 - 86

17174.3 to 17860.7 53.48 - 136.06 to 52.01 - 136.93

77

83 - 85

RP-1-0C-71Fig 9

400 ->~

-IlL.

~~0-z-a::

tr.l 0LJa::-z:_z:w~~cczz: ...... -400

0

tr.l0::::W 2000-wz::Z

I4000-a..

wCl

6000

162OI6TRNCE

1

78

RP-1-0C-71Fig 9

I ~

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54 155 155 157

~

I I

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79

~II I I ..

RP-1-0C-71Fig 9

166

!; .. 6; F:"!E~ ~ ~... ... ...

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170

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400

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300 S

~«2:

200 0'-171 z

«0.::W

100 ::)(9::)

~ r; 0~ ~

m... ...!!! E

0jgf.:

81

RP-1-0C-71Fig 9

400

O+----........-----Io-n-+------~'--+--......-"-_tf'_-+f_

-400

;: 4000a...l&.JCJ

lJ)a:::l&.J~

W~

Z

2000

6000

1-7-1-----l-----+---+--~-II-------l-iOIST~NCE IN N~UTIC~L MILES

'! .. I; ~~

J t: t: t:

~ E f! !!!I III I I' I I I I J' I I' I IIh

82

RP-1-0C-71Fig 9

174

l; ~... . ~- .

~ ~'! II! • co "! -t:: t:: t:: t:: :I.; - - ~ -- ... ... ... ...~ - - ~ -:I !!: E ~

...... - ~

I I' , I I' lit I I I I' I I I I I I .. I " II I II • I I .... I Ico

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83

73

RP-1-0C-71Fig 9

II .... I II II...

I

2I I I I I I

...!:!

IHc;,

84

179

r; 0; -!!

~... ...!! ...

t;: !:!1 • 1 I I I 1 I I I'

>+100....J«

2:o

~ .... z.--....-----to--=~~===-= ........._c:::;:::~~+-kL---------l « .!:Do 0

0::0>- E«'-'w

-100~LL

400...-....(/)

00>

300 E

~«

2002:

I 01B2 z«0:::W

100 ~

(9~

0CD

0

I

1B11B~'~,

F: .. ..~ ~.. .. ..- E!:: E

--'II I I Ii I I I I II II

I

85

8. ACKNOWLEDGEr~ENTS

I thank F. P. Naug1er and J. M. Wageman for providing information

and helpful suggestions used in the preparation of this report. They,

along with R. E. Burns, read the manuscript and offered constructive

criticisms. LTJG G. Holloway of the NOAA Commissioned Corps was respon

sible for producing the geophysical profile. S. P. Perry assisted him

with the data preparation. R. R. Uhlhorn did the drafting. Mrs. Kim

Hamasaki typed the manuscript.

A special acknowledgement is due the officers and crew of the

OCEANOGRAPHER. Their efforts contributed to the success of RP-1-0C-71.

9. REFERENCES

Erickson, B. H., D. K. Rea, and F. P. Naug1er (1969), "Chinook Trough:

A probable consequence of north-south sea floor spreading," abstract:

Trans. Am. Geophys. Union, 50, 633.

Holloway, Gregory (1970), "Programs for Data Acquisition and Processing

Aboard the NOAA Ship OCEANOGRAPHER,II POL Manual.

Naug1er, F. P., and D. K. Rea (1970), "Abyssal hills and sea floor spread

ing in the central north Pacific," Geological Society of America

Bulletin, ~, 3123-3128.

86

APPENDIX A

Scientific Personnel

Name Affiliation Dates

Robert E. Burns NOAA - POL 31 March - 2 Apri 1

Frans Vandekop Odum Offshore Survey Co. 31 March - 2 April

Frederic P. Naug1er* NOAA - POL 31 March - 12 June

Richard Sy1wester NOAA - POL 31 March - 26 June

Richard R. Uhlhorn NOAA - POL 31 March - 26 June

John M. Wageman** NOAA - POL 4 Hay - 26 June

Jurgen Kienle U of Alaska 1 June - 12 June

David Stone U of A1 aska 1 June - 12 June

Robert E. Stevenson U of So. Dakota 12 June - 26 June

John T. Kummer U of Washington 12 June - 26 June

Weather Observers

Robert A. Hadler Nat. Weather Service 31 March - 28 April

Edward I. Fogman Nat. Weather Service 31 March - 28 April

Carlos Rodrigues Nat. Weather Service 31 March - 28 April

Ramon A. Choffee Nat. Weather Service 4 May - 26 June

Erce11 R. Iverson Nat. Weather Service 4 May - 26 June

* Chief Scientist on Legs I and II.

** Chief Scientist on Legs III and IV.

87

APPENDIX B

Summary of Special Projects

Bathythermographs

Expendable bathythermograph (XBT) observations were at 0000, 0600,

1200, and 1800 GMT except when the seismic profiler was operating. BT

data was transmitted to Navy Fleet Weather Central in Honolulu and copies

were also sent to the National Oceanographic Data Center.

Dredging

As part of a project to investigate several northeast Pacific

seamounts, dredging operations were conducted in an area about 140 miles

west of the Queen Charlotte Islands. John T. Kummer, a graduate student

at the University of Washington, was on board for this phase of the work.

Four seamounts, Dickens, Denson, Davidson, and Hodgkins were sampled with

chain bag and pipe dredges. Sixteen of the twenty-four attempted hauls

were successful with the exception of some ice rafted boulders found in

a few hauls the dredged samples consisted of weathered basalt. A bathy

metric and magnetic survey was made of each seamount prior to dredging.

Meteorology

National Weather Service personnel made surface and upper air

meteorological observations daily throughout the cruise. Surface obser

vations were made at 0000, 0600, 1200, and 1800 GMT. Radiosonde informa

tion was obtained at 0000 and 1200 GMT. Facsimile weather charts,

88

transmitted from Fleet Weather Central, Honolulu, aided the ship's

meteorology officer in setting up the weather forecasts for shipboard use.

Large Volume Water Sampling

At the request of Wyatt Silker of Battelle-Northwest in Richland.

Washington, large volume water sampling was carried out aboard ship.

Water filter, flow meter, and other supplies were provided Battelle.

Twenty-nine samples were taken during the field operations, and forwarded

to Battelle from Honolulu, Kodiak, and Seattle.

89

Summary of Underway Operations

Track1ine gravity

Track1ine magnetics

Track1ine soundings

Sub-bottom profile (CSP)

17.516 lin. naut. miles




BT lowerings - all depths 124

Bottom sample. dredge hauls

- less than 1000 m 2

- more than 1000 m 22

Meteorological radiosonde 126

Radionuc1ide water samples 29

90

APPENDIX D

Base Tie Summary

Sea-Level Grav. Zero DriftPlace Date Meter (gals) Meter Grav. (mgal)

PMC 31 March 38.080 980.7427 976.8738

Honolulu 28 April 20.270 979.9413 976.8819 +8.1

Honolulu 1 May 20.267 978.9426 976.8835 +1.6

Kodiak 28 May 47.840 981.7486 976.8881 +4.6

Kodiak 1 June 47.820 981.7480 976.8895 +1.4

Sitka 12 June 47.360 981.6992 976.8874 -2.1

PMC 28 June 37.925 980.7425 976.8893 +1.9

91 GPO 841 -726

ERRATA

"RP-1-0C-71 Northeast Pacific Geophysical Survey, " H. R.Stevens, Jr. , NOAA Tech. Rept. ERL 232-POL 10 , January 1972.

Note page number changes.

FIGURE 6

LOCATION INDEX

Leg I SEATTLE - HONOLULU (See Figure 2 )

Distance in n miles Degrees Degrees Pagesalong track Lat Lo ng Lat Lo ng

0 to 500.1 36.91 - 125.03 to 34.35 - 133.64 18 - 19500.1 to 1000.1 34.35 - 133.64 to 32.75 - 143.45 19 - 21

1000.1 to 1500.6 32.75 - 143.45 to 31.08 - 153.08 21 - 231500.6 to 2000.4 31.08 - 153.08 to 34.45 - 149.16 23 - 242000.4 to 2500.3 34.45 - 149.16 to 36.14 - 139.16 24 - 262500.3 to 3000.0 36.14 - 139 . 16 to 34.29 - 142.79 26 - 273000.0 to 3500.6 34.29 - 142.79 to 32.65 - 152.60 27 - 293500.6 to 3999.9 32.65 - 152.60 to 34.22 - 144.40 29 - 303999.9 to 4499.9 34.22 - 144.40 to 32.86 - 153.38 30 - 324499.9 to 4999.6 32.86 - 153.38 to 34.74 - 144.30 32 - 334999.6 to 5501.1 34.74 - 144.30 to 33.45 - 152.94 33 - 375501.1 to 6000.3 33.45 - 152.94 to 34.93 - 145.13 37 - 386000.3 to 6500.1 34.93 - 145.13 to 32.54 - 152.39 38 - 406500 . 1 to 6999.4 32.54 - 152.39 to 34.18 - 142.62 40 - 416999.4 to 7499.4 34.18 - 142.62 to 29.24 - 143.46 41 - 437499.4 to 8000.4 29.24 - 143.46 to 27.54 - 152.75 43 - 448000.5 to 8570.4 27.54 - 152.75 to 22.03 - 157.23 44 - 46

Developed Area: Abyssal Hi 11s

1715.1 to 6999.4 33.48 - 154.75 to 34.18 - 142.62 23 - 41

17

\

ERRATA

"RP-1-0C-71 Northeast Pacific Geophysical Survey," H. R.Stevens, Jr .• NOAA Tech. Rept. ERL 232-POL 10, January 1972.


FIGURE 7

LOCATION INDEX

Leg II HONOLULU - KODIAK (See Figure 3)

Distance i n n miles Degrees Degrees Pag esa long track Lat Long Lat Long

8628.3 to 9099.7 21.81 - 158.18 to 29.67 - 158.16 48 - 499099.7 to 9599.3 29.67 - 158.16 to 38.00 - 158.18 49 - 519599.3 to 10100.3 38.00 - 158.18 to 40.40 - 164.93 51 - 53

10100.3 to 10600.5 40.40 - 164.93 to 45.11 - 168.98 53 - 5410600.5 to 11099.9 45.11 - 168.98 to 44.71 - 165.50 54 - 5611099.9 to 11600.0 44.71 - 165.50 to 44.78 - 166.21 56 - 5711600.0 to 12100.3 44.78 - 166.21 to 48.84 - 160.57 57 - 5912100.3 to 12600.2 48.84 - 160.57 to 52.82 - 157.79 59 - 6112600.2 to 13100.0 52.82 - 157.79 to 55.94 - 153.36 61 - 6313100.0 to 13590.6 55.94 - 153.36 to 57.21 - 151.40 63 - 65

Developed Area: Chinook Trough

10807.7 to 11795.6 47.59 - 167.51 to 47. 10 - 165.01 55 - 58

47

-- ~- - - ---~~-- ~- --~ ~

ERRATA

"RP-1-0C-71 Northeast Pacific Geophysical Survey," H. R.Stevens, Jr., NOAA Tech. Rept. ERL 232-POL 10, January 1972.


FIGURE 8

LOCATION INDEX

Leg III KODIAK - SITKA (See Figure 4)

Distance i n n miles Degrees Degrees Pa gesalong t ra c k Lat Long Lat Long

13643.3 to 13999.9 58.04 - 151.88 to 57.39 - 155.73 68 - 6913999.9 to 14600.3 57.39 - 155.73 to 55.24 - 145.10 69 - 7114600.3 to 15099.8 55.24 - 145.10 to 58.80 - 147.61 71 - 7315099.8 to 15600.2 58.80 - 147.61 to 59.62 - 148.52 73 - 7415600.2 to 16185.6 59.62 - 148.52 to 56.93 - 135.64 74 - 76

Developed Area: Shelikof Strait

13684.3 to 14274.3 58.41 - 151.62 to 58.84 - 151.61 68 - 70

67

ERRATA

"RP-1-0C-71 Northeast Pacific Geophysical Survey," H. R.St eve ns, Jr., rw AATe c h. Rep t. ERL 232- POL 10, Jan ua r y 19 72 •


FIGURE 9

LOCATION INDEX

Leg IV SITKA - SEATTLE (See Figure 5)

Distance i n n mil es Degrees Degrees Pa g esalong track Lat Long La t Long

16217.2 to 16699.9 57.38 - 135.96 to 53.98 - 141.08 78 - 7916699.9 to 17199.9 53.98 - 141.08 to 53.48 - 136.78 79 - 8217199.9 to 17700.4 53.48 - 136.78 to 53.87 - 133.75 82 - 8417700.4 to 18114.2 53.87 - 133.75 to 51.84 - 130.29 84 - 85

Developed Area: Seamounts

17174.3 to 17860.7 53.48 - 136.06 to 52.01 - 136.93 82 - 84

77