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Approved for public release; distribution isunlimited.

Distribution authorized to U.S. Gov't. agenciesand their contractors; Critical Technology; MAY1967. Other requests shall be referred to AirForce Technical Applications Center,Washington, DC. This document contains export-controlled technical data.

usaf ltr, 28 feb 1972

U3«

00

LONG RANGE SEISMIC MEASUREMENTS

SCOTCH

sioj ^00

23 MAY 1967

Prepartd for

AI* FORCE TECHNICAL APPLICATIONS CENTER

Washington. D. C.

25 OCTOBER T967

By

TELEDYNE. INC.

Under

Project VELA UNIFORM

D D C

Noviauatf

B

Sponsored By

ADVANCED RESEARCH PROJECTS A6ENCY Nuclear Test Detection Office

ARPA Order No. 624

I i. ' !

DISCLAIMER NOTICE

THIS DOCUMENT IS THE BEST

QUALITY AVAILABLE.

COPY FURNISHED CONTAINED

A SIGNIFICANT NUMBER OF

PAGES WHICH DO NOT

REPRODUCE LEGIBLY.

f

r

LONG RANGE SEISMIC MEASUREMENTS

SCOTCH

23 May 1967

SEISMIC DATA LABORATORY REPORT NO. 200

AFTAC Project No.:

Project Title:

ARPA Order No.:

ARPA Program Code No.:

VELA T/6702

Seismic Data Laboratory

624

5810

Name of Contractor: TELEDYNE, INC.

Contract No.:

Date of Contract:

Amount of Contract:

Contract Expiration Datei

Project Manager:

F 33657-67-C-1313

2 March 1967

$ 1,736,617

1 March 1968

William C. Dean (703)836-7644

P. 0. Box 334, Alexandria, Virginia

AVAILABILITY

This document is subject to special export controls and each

transmittal to foreign governments or foreign national may be

made only with prior approval of Chief, AFTAC.

This research was supported by the Advanced Research

Projects Agency, Nuclear Test Detection Office, under

Project VELA-UNIFORM and accomplished under tb technical

direction of the Air Force Technical Applications Center

under Contract F 33657-67-C-1313.

Neither the Advanced Research Projects Agency nor the

Air Force Technical Applications Center will be responsi-

ble for information contained herein which may have been

supplied by other organizations or contractors, and this

document is subject to later revision as may be necessary.

TABLE OF CONTENTS

EVENT DESCRIPTION

INTRODUCTION

INSTRUMENTATION AND PROCEDURE

DATA AND RESULTS

TABLES

1 Station Status Report - SCOTCH

2 Principal Phases - SCOTCH

FIGURES

1 Recording Stations and Signals Received

2 Unified Magnitudes

3 Adjusted Unified Magnitudes

4 Travel-Time Residuals, T-A/8.1; T-JB

5 Maximum Amplitudes of Pn and P

6 Maximum Amplitudes of Pg

7 Maximum Amplitudes of Lg

8 Maximum Amplitudes of LQ

9 Maximum Amplitudes of LR

LIST OF APPENDICES

1(A) Recording Site Information

1(B) Unified Magnitudes from Pn or P Waves

11(A) Seismic Analysis Diagram

11(B) Instrument Response Curves - LRSM

11(C) Instrument Response Curves - LASA

11(D) Instrument Response Curves - other Short Period

Page No

l •L

2

2

4

I

DATE:

TIME OF ORIGIN!

YIELD:

MAGNITUDE:

LOCATION:

SITE:

ENVIRONMENT:

FCOTCH

EVENT DESCRIPTION

23 May 1967

14:00:00.OZ

5.51 + 0.75

Nevada Test Site, Area U19as

GEOGRAPHIC COORDINATES:

Lat:

Long:

37" 16' 30.0" N

116° 22' 12.0" W

RHYOLITE

6761 ft.

3492 ft.

3269 ft.

COMPUTED EPICENTER:

GEOLOGIC MEDIUM:

SURFACE ELEVATION:

SHOT ELEVATION:

SHOT DEPTH:

ALL STATIONS

GEOGRAPHIC COORDINATES:

Lat:

Long: U6W 28' 58.8" W

TIME OF ORIGIN: 14:00:01.4Z

DEPTH CONSTRAINED TO; 0 km

EPICENTER SHIFT: 10.8 km S 68°

37w 14' 16.8" N

.o

- 1 -

-

Cod« •tatlen

MlM. »vada

Kanab, Utah

Tonto rarest SalMolo^lcal Obaarvatory, Ariaona

Final sn trt vrz LP* ir * * * •f *

♦ + * + *

Tap* rimiaq

MO-TD Mountain t, Idaho

OUta Baaln MlMWlegleal observatory. Oragon

Blua Notmtaln dalaaoloqlcal Obaarvatory, Orogon

MKO rranktown, Colorado ♦ ♦ ♦ ♦ ■f

IAO Subarray, AO-lO.Mootana ♦ ■ I M • 8A4TX Can Angalo, Taxaa ♦ ■ ■ + ♦

Wichita Mountains MlMologi- eal Obaarvatory, Oklahoaa

ST2TX at root «r, TOKM ♦ ■f ♦ - GR2TX Or it, TOKM ♦ ■f ■f +

sun Grit, Taxa» ♦ ♦ ♦ ♦ rriTx •troator, Taxaa ■•• ■•• ■f ♦

ra-wc rrlneo Oaorga, British Colurtlia, Canada ♦ + ♦ +

nc-oi

cno

Md Lake, Ontario,

Cuaborland Platoau

Canada

•olB-

+ •»■ ♦ ♦

»ological Obaarvatory,Tana.

«hltahors«, TOkon Territory Canada '

W-MI Houlton, Mains

8V3QB Scheffervllle. Quebec, Canada

rr-PT Mould Bay, Morthwest Torrltorlos, Canada

Z Inoparative ■ »o Zaatroawnt r Priaary Tlainf ♦ «igna;

■o Signal Magnetic Tape Available Nagni£lMt.

INTRODUCTION

A long seismic measurements (LRSM) program and several larger

seismographic observatories were established under VELA-UNIFOW4 to

record seismological data resulting from natural seismic activity

and a planned series of U. S„ underground nuclear tests. The LRSM

teams are mobile and occupy locations selected to provide optimum

data from events of special interest; the observatories are per-

manent installations as follows:

Wichita Mountaire Seismological Observatory (WMSO) L awt on, Ok1ahoma

Uinta Basin Seismological Observatory (UBSO) Vernal, Utah

Tonto Forest Seismological Observatory (TFSO) Payson, Arizona

Large Aperture Seismic Array (LASA) Billings, Montana

The purpose of this report is to provide am analysis of data

resulting from the SCOTCH event recorded by the LRSM teams and the

VKLA observatories and a preliminary summary of data reported by

other permanent and temporary seismographic stations.

INSTRUMENTATION AND PROCEDURE

The instrumentation at each of the LRSM locations consists of

three-component short-period and three-component long-period seis-

mographs. In general, data are recorded o-i 35 millimeter film

and on one-inch 14 channel magnetic tape, although recently more

portable instrumentation has been incorporated which records only

on magnetic tape. The stations are all equipped to record WWV

continuously to provide accurate time control. Calibration is accom-

plished once each day and just prior to each shot at the operational

settings. Pertinent information useful for analysis of LRSM data is

available to qualified users of this data and is contained in Technical

- 2 -

Report 65-43, "Interpretat.on and U.age of Se^ic Data. LRSM P::ogra.

General infor.at.on on LRSM van and portable ayate-n equipment and

oparatron x, c,lven ln TeChnical Report 66.27| ,^ LRs>, ^.^ ^

^logrcal Laboratory, ■■ and 65-74, "A Portable Sei.mograph." copie.

of theae report. may be obtained fro. DDC. «.. «, control nulrtber o£

Technioal Report 66-27 is 480343. All the ob.ervatories have both

long-period and .hort-pariod, three-oomponent in.tru,nentation, in

addition to their other apecialized facilities.

Station information is pre.ented in Appendix 1(A). This inolude.

the station name and code: the aeooranki,. e, tne geographic aoordinates! the distances

and azimuths involved,- the station elevations, and the type of in-

struments in use at each location. Representative instrumental re-

sponse curves are shovn in Appendix 11(B), II(C) , and lift,,

The procedure, used in measuring amplitudes reported herein are

illustrated in Appendix II (A) and the unified magnitude is calculated

as shown in Appendix l(B). n* distance factors (B) beyond 16° are

from Gutenberg and Richter*. For distance less than 16° values were

read from a curve in the Gutenberg and Richter paper bade to 10° and

then extrapolated to 2°. using an inverse cube relationship. An additional magnitude for IPSS t-K»« ieP

less than 16 was computed using a method described by Evernden**. (Figure 3)

A standard hypocenter location program for a digital computer

- used to determine the . ocation using data from all stations analyZÄd.

- 3 -

* Gutenberg, B. and Richter c F M^««^ ^ "I ' "" Ann. Geofis,, 9 (1956), pp i-^. *' ^"^ude and Energy nf v^^^

center Technical Repo^ W-G5-4ä, (Tilt) ^p ^ Sei8,nolo?ical

Best-fit values of latitude, longitude, and time of origin are deter-

mined statistically by a least squares technique« This utilizes a

Jeffreys-Bullen travel-time curve as modified by Herrin in 1961 on

the basis of Pacific surface-focus recordings» Precision of the com-

putation is limited primarily by the accuracy of arrival times, the

validity of the standard travel-time curve, and by local velocity

deviations. This method is based on P-wave arrivals with depth con-

strained to zero,

DATA AND RESULTS (LRSM AND VELA OBSERVATORTPS i

The parameters of the SCOTCH event and a summary of the seismic

evaluation are shown on the Event Description page. The operational

status of the 21 LRSM stations and observatories is given in Table I,

and illustrated in Figure 1.

Table 2 summarizes the measurements made of the principal phases

from the SCOTCH event at the LRSM and VELA stations. Included are

the Pn and P arrival times, the maximum amplitudes (A/T) of Pn or P

motion and other phases as seen on the short-period instruments.

Long-period Love and Rayleigh wave motion are also tabulated in (A/T)

form. In addition, individual station Rayleigh wave areas (mm2) is

indicated as measured on the LPZ only. Although reduced to IK magni-

fication, they have not been normalized to any magnitude. Twenty-one

stations recorded short-period and long-period signals.

The unified magnitudes determined from the LRSM and VELA observa-

tories are shown in Figure 2. The average magnitude is 5.51 + 0.75.

The adjusted unified magnitude is 5.29 + 0.62.

The travel-time residuals from the Pn and P phases are shown in

Figure 4. Figures 5 through 9 illustrate plots of the amplitudes of

P, Pg, Lg, LQ, and LR,

Attached to the report are illustrative seismograms showing the

signal, recorded at four stations. The roost distant station analyzed

that recorded srorCH was NP-NT at a distance of4348 kilometer«.

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where A - zero to peak ground motion in millimicrons = (rmn) (10QQ)

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= record amplitude in millimeters zero to peak

K = magnification ir thousands at signal frequency

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Dist (dec») B

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2.2 2.7

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56 3.8 3.8

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4.3 4.4

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unified Magnitudes Froai ? or P Waves Appendix 1(B) a

d = ^laximum

Bottom of line

Maximum

Bottom of line

Detail Showing Allowance

For Line Width

PicX time of Pn at beginning of "a" half cycle.

Pick amplitude of Pn as maximum Md/2n within 2 or 3 cycles of "c'

Pick amplitudes of Pg and Lg^ at maximum of corresponding motion.

Seismic Analysis Diagram

APPENDIX 11(A) ■ "-- '!'----'•

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DOCUMENT CONTROL DATA

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TELEDYNE, INC. ALEXANDRIA, VIRGINIA

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LONG RANGE SEISMIC MEASUREMENTS - SCOTCH

i ■HMM wrm mnRQBRa BBasnaor Scientific

I AUTMONm BB S 1*7

ClarK, Don M.

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• a. CONTMACT OH «KANT NO.

F 33657-67-C-1313 k rmojucr No.

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*ARPA Order No. 624 AARPA Program Code No. 5810

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200

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unclassified Security Classification

KEY WORDS

Seismic Magnitude silsJWLc Travel-Time Seismic Amplitude VELA-UNIFORM

Nuclear Tests

LINK A ROkC • T

UN« ■ wmLM

1INK C

-~—————————~ INSTRUCTIONS

1. ORIGINATING ACTIVITY! Enf« th. »•"• •"• J^ftV ol IIM coatraclor, •ubcontrsctor, srwil«, MHMWKM ü» J.n« itLity or oth« or«.nl..Uo« .'«»po««. •"«»•'> «•■»»"«

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