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Distribution authorized to U.S. Gov't. agenciesand their contractors;Administrative/Operational Use; 21 NOV 1966.Other requests shall be referred to Air ForceTechnical Applications Center, Washington, DC.

AFTAC ltr 28 Feb 1972

MAif iEÄK

m mMS lANGi SfISMIC MEÄSlÄi^ÄNTS

HALF BEAK 00

3 jyNf 1»e

AiR

»f(ipei*#ci far

21 NOViMlli 1»*

n

fMTH SC!fN

BEST AVAILABLE COPY

LONG RANGE SEISMIC MEASUREMENTS

HALF BEAK

30 June 1966

SEISMIC DATA LABORATORY REPORT NO. 171

AFTAC Project No.:

Project Title:

ARPA Order No.:

ARPA Program Code No

Name of Contractor:

Contract No.:

Date of Contract:

Amount of Contract:

Contract Expiraition Date:

Project Manager:

VELA T/6702

Seismic Data Laboratory

624

5810

EARTH SCIENCES DIVISION TELEDYNE INDUSTRIES. INC

AF 33(657)-15919

18 February 1966

$ 1,842,884

17 February 1967

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 Re-

search Projects Agency, Nuclear Test Detection Office, under

Project VELA-UNIFORM and accomplished under the technical

direction of the Air Force Technical Applications Center under

Contract AF 33(657)-15919 .

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 docu-

ment is subject to later revision as may be necessary.

TABLE OF CONTENTS

Page No.

EVENT DESCRIPTION 1

INTRODUCTION 2

INSTRUMENTATION AND PROCEDURE 3

DATA AND RESULTS 5

TABLES

1 Station Status Report - HALF BEAK

2 Principal Phases - HALF BEAK

FIGURES

1 Recording Stations and Signals Received

2 Unified Magnitudes

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

4 Maximum Amplitudes of Pn and P

5 Maximum Amplitudes of Pg

6 Maximum Amplitudes of Lg

7 Maximum Amplitudes of LQ

8 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

BLANK PAGE „^—„„ i .

.

iiimiir iTijijiT'T"-

mm

DATE:

TIME OF ORIGIN:

YIELD:

MAGNITUDE:

LOCATION:

ENVIRONMENT:

HALF BEAK

EVENT DESCRIFPION

30 June 1966

22:15:00.1Z

6.02 + 0.60

SITE: Nevada Test Site, Area Ül9b

GEOGRAPHIC COORDINATES:

Lat: 37O18'57.0" N

Long: 116O17'56.0" W

COMPUTED EPICENTER:

GEOLOGIC MEDIUM: Rhyolite

SURFACE ELEVATION: 6791 ft.

SHOT ELEVATION: 3907 ft.

SHOT DEPTH: 2884 ft.

ALL STATIONS

GEOGRAPHIC COORDINATES;

Lat: 37O13,12.0" N

Long: 116O24'36.0" W

TIME OF ORIGIN:

DEPTH:

22:15r04.9Z

52.6 km

EPICENTER SHIFT: 14.4 km, S 43 W

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Station Status Report - HALF BEAK

Table I

i " ■

E I

i1

INTRODUCTION

A long range seismic measurements (LRSM) program and

several larger seismographic observatories were established

under VELA-UNIFORM to record seismological oata resulting

from natural seiamic 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 permanent instal-

lations as follows.

Wichita Mountains Seismological Observatory (WMSO) Lawton, Oklahoma

Uir.ta Basin Seismological Observatory (UBSO) Vernal, Utah

Blue Mountain Seismological Observatory (BMSOJ Baker, Oregon

Cumberland Plateau Seismological Observatory (CPSO McMinnville Tennessee

Tonto Fo.est Seismological Observatory (TFSO) Payson, Arizona

Large Aperture Seismic Array (LASA; Billings, Montana

The purpose of this report is to provide an analysis

- 2 -

. .U—I—-i.. -,..-■■—.1— - m.. II«! "I 11 I - - - -*

of data resulting from the HALF BEAK event recorded by the

LRSM teams and the VELA 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 seismographs. In general, data are recorded on

35 millimeter film and on one-inch 14 channel magnetic tape

although recently more portable instrumentation has been in-

corporated which records only on magnetic tape. The stations

are all equipped to record WWV continuously to provide accu-

rate time control and calibration is accomplished 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 Report 65-43, "Interpretation and Usage of

Seismic Data, LRSM program." General information on LRSM van

and portable system equipment and operation is given in

Technical Reports 66-27, "The LRSM Mobile Seismological Labo-

ratory," and 65-74, "A Portable Seismog.-'aph." Copies of

- 3 -

these reports may be obtained from DDC. The AD control num-

ber of Technical Keport 66-27 is 480343. All the observa-

tories have both long-period and short-period, three-component

instrumentation, in addition to their other specialized fa-

cilities.

Station information is presented in Appendix I. This

includes the station name and code; the geographic coordi-

nates, distances and azimuths involved; the station ele-

vations; and the t/pe of instruments in use at each location.

Representative instrumental response curves are shown in

Appendix II(B).

The procedures used in u.easuring amplitudes reported

herein is illustrated in Appendix 11(A) and the unified

magnitude is calculated as shown in Appendix 1(B). The

distance factors (B) beyond 16° are from Gutenberg and

Richter*. For distances less than 16° values were read

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

and then extrapolated to 2°, using an inverse cube re-

lationship.

A standard hypocenter location program for a digital

- 4 -

*Gutenberg, B. and Richter, C. F., Magnitude and Energy of Earthquakes, Ann. Geofis., 9 (1956), pp. 1-15

computer i. used to determine the location using data from

all stations analyzed. Best-fit values of latitude, longi-

tude, depth of focus, and time of origin are determined

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 computation is limited primarily by the

accuracy of arrival times, the validity of the standard

travel-time curve, and by local velocity deviations, since

the method is based on P-wave arrivala, this particular

program does not make use of later phases such as pP and S

in the oetermination of depth or location.

DATA AND RESULTS (LRSM .nH y^ OBSEm/ATOP^c.

The parameters of the HALF BEAK ev^nt and a summary of

the seismic evaluation is shown on the Event Description

page. The operational status of the 22 LRSM stations and

observatories is given in Table 1 and illustrated in Figure 1.

Table 2 summarizes the measurements made of the

principal phases from the HALF BEAK 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 .nd other phases

- 5 -

1

as seen on the short-period vertical 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. Al-

though reduced to IK magnification, they have not been

normalized to any magnitude. Twenty-one stations recorded

short-period signals. Long-period signals from this event

were recorded by 20 stations.

The unified magnitudes determined from the LRSM and

VELA observatories is shown in Figure 2. The average magni-

tude is 6.02 + 0.60 .

The travel-time residuals from the Pn and P phases

are shown in Figure 3. Figures 4 through 8 illustrate plots

of the amplitude of P, Pg, Lg, LQ, and LR.

Attached to the report are illustrative seismograms

showing the signals recorded at 4 stations. The most distant

station analyzed that rscorded HALF BEAK was SV3QB at a

distance of 4187 kilometers.

- 6 -

rrlncli|Ml rhmmma tiAi.r IMK }0 JUM 19M

■■.I..1. Utah

Tonto ror«at ObMrvatory. Ar.aon«

i'lnti iaain Obaarvatery, Utah

Bluo Hountain Obaarvatery, Oragon

Bubarray AO-10, Montana

Bwaat^raaa, Montana

Itadif, South Dakota

winner. South Dakota

Ntchlta Hountain Obaarvatery, Oklaheaa

Crete, Habraaka

Jaapar, Albarta, Canada

tu m • FT LPT LPI

■ PZ ■ PZ «FT rpT L«

• «-1 IPS-1 ■rz-i ■rz-t •K-l m SPM L« .m LPT

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8PZ-J «PZ-3 BPZ-J BM BPI tPB LPZ

SPZ BPZ BPZ SPZ BPB iPT LP* LPT LPZ

SPZ SPZ SPZ BPZ SPZ SPZ SPH 6 FT Ln LPT LPZ

S?S SPZ 6PZ BPZ SPR 8PT LPF LPT LPZ

BPZ-« SPZ-6 SPZ-6 LPS LPN BK SPN LPM LPZ

BPZ BPZ SPZ SPit

8PT Lpa Lr? LPZ

SPZ SPZ SPZ SPZ SPZ SPZ BPZ LPR LPT 8 PR 8PP LPM LPT LPZ

Hagnl- Clcat ion

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43.1 43.3 43.3 11.61* 40.0 47.3 0.73 7.45 3.43

340 340 340 53.0 S1.0 70.0 70.0 27.6*

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J.76* 4.1

69.5 69.5 69.5 6V,5 «0.5 (.9,5 69.5 10.0 13.45 72.0 68.6 10.8 13.45

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7 30

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591 1581 1363 (651) 585

'3343)

■3.7 337 487 445 410 391 357

(1036 (1177

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ATM (— I LPS

Principal Phases - HALF BEAK

Table 2 - Page 1

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Coda station )iatanca

(knl

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Elav. _ (km)

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Ailmuth

Sta. Epl.

Radial T«ng.

or " Small tnat.

SP

T. X

ha-NV Htna, Bavaa» 303

it 11

39c26'10" K

37o01l22" »

118O08153" W

112049'39" w

1,52

1.7 5

308°

95°

127°

277° 95° 195° I. X

im-ui

* Kanab, Utan

Tonto foraat 565 34

unified Magni

where

Table

tude: m = log10 (A/T), + B A = zero to peak ground motion in millimicrons

= (mm) (1000) K

T - signal period in seconds B = distance factor (see Table below) mm = record amplitude in millimeters zero to

peak K - magnification in thousands at signal

frequency

of Distance Factors («) tfflg Zero Depth

Dist (deq) B „o 0 —

1 - 2 2.2 3 2.7 4 3.1

5 3.4 6 3.6 7 3.8 8 4.0 9 4.2

10 4.3 11 4.2 12 4.1 13 4.0 14 3.6

15 3.3 16 2.9 17 2.9 18 2.9 19 3.0

20 3.0 21 3.1 22 3.2 23 3.3 24 3.3

25 ?.5 26 .4

Dist (deq) B

27° 3.5 28 3.6 29 3.6

30 3.6 31 3.7 32 3.7 33 3.7 34 3.7

35 3.7 36 3.6 37 3.5 38 3.5 39 3.4

40 3.4 41 3.5 42 3.5 43 3.5 44 3.5

45 3.7 46 3.8 47 3.9 48 3.9 49 3.8

50 3.7 51 3.7 52 3.7 53 3.7

Dist Dist

(deq) B (deq) B

54° 3.8 80° 3.7 81 3.8

55 3.8 82 3.9 56 3.8 83 4.0 57 3.8 84 4.0 58 3.8 59 3.8 85 4.0

86 3.9 60 3.8 87 4.0 61 3.9 88 4.1 62 4.0 89 4.0 63 3.9 64 4.0 90 4.0

91 4.1 65 4.0 92 4.1 66 4.0 93 4.2 67 4.0 94 4.1 68 4.0 69 4.0 95 4.2

96 4.3 70 3.9 97 4.4 71 3.9 98 4.5 72 3.9 99 4.5 73 3.9 74 3.8 100 4.4

101 4.3 75 3.8 102 4.4 76 3.9 103 4.5 77 3.9 104 4.6 78 3.9 79 3.8 105 4.7

Unified Magnitudes From Pn or P Waves

Appendix 1(B)

d ■ Maximum

Bottom of

Maximum

Bottom of line

Detail Showing Allowance

For Line Width

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

Pick amplitude of Pn as maximum "d/j" 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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HALF BEAK

SV3QD

SCHEFFERVILLE, QUEBEC

30 JUNE 1966

A = 4187 km

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HOULTON, MAINE

30 JUNE 1966

A • 4073 km

UP «—22:21:29.9 Z • SPZ-LO' ^

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Unclassified Security Cl«»gification

DOCUMENT CONTROL DATA • RAD (StturHy cimmmUlcmllan ol till: body of mbtltmcl mnd Indmmlnt mnnotmtlan imi«l b* mn»rmd a*an tfw onnll tmpon it clmtnlitd)

t ORIGINATING ACTIt/ITV (Coipormlt tulhoi)

TELEDYNE INDUSTRIES, INC. EARTH SCIENCES DIVISION ALEXANDRIA, VIRGINIA 22 314

|a. NCFOHT tccuniTr c UAMI'ICATION

Unclassified tfe amoup

I mtPomr TITLB

Long Range Seismic Measurements - HALF BEAK

4 OESCftlPTIve MOTES (Typ* ol «port an« IncW« d*l..)

Scientific i AUTHOItO; fl.«»l nan«. Mnl nrnmt. Inlllml)

Clark, Don M.

«. nnponr DATI 21 November 1966

• «. COMTKACT OR SRAMT NO.AF 3 3 (6 57 ) -1 59 19

kRuojBCTNo. VELA T/6702

• ARPA Order No. 624

a. ARPA Program Code No. 5810

10. torAU no or p»o«i 20

?6. NO. or -'.»• 1

(a. ORiaiNATOn-» RIPORT NUwaBRfSJ

SDL Report No. 171

§b. 9THCR »POMT MOf»; (Any alhmr numbtn *•( aw»' fc« »fl0Md

^0■ AVAILABILITY/LIMITATION NOTICKS

This document is subject to special export controls and each trans- mittal to foreign governments or foreign national may be made only with prior approval of Chief, AFTAC.

It. SUPCLEMKNTARY NOT« It. (PONtORINO MILITARY ACTIVITY

ADVANCED RESEARCH PROJECTS MSENCY NUCLEAR TEST DETECTION 0FF1 ^ WASHINGTON, D. C.

II. ABSTRACT

An analysis of seismological Cata from an underground

nuclear explosion as a continuing study to provide information

to aid in distinguishing between earthquakes and explosions.

A table of travel-times and amplitudes of P, Pg, Lg, and surface

waves are included along with other unidentified phases.

DD .A 1473 Unclassified Security Ciawification

■kWH

Unclassified Sccuiity CI«»«ific«tion

KEY WORD.

Seismic Magnitude

Seismic Travel-Time

Seismic Amplitude

VELA-UNIFORM

Nuclear Tests

LINK B

ROLE MT

INSTRUCTIONS

1. ORIGINATING ACTIVITY: Einer the n.m» and addr»» ot Ihr contractor, subcontractor, grantee. Department of De- fenae activity or other organization fcorporal« author; Issuing the report.

2a. REPORT SECUHTY CLASSIFICATION: Enter the over- all security claaalficatlon of the report. Indicate «-'•ether "Restricted Data" Is Included. Marking la to be in accord- ance with appropriate security regulations.

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