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usaf ltr, 28 feb 1972

NASH

00 IONO RANGE SEISMIC MEASUREMENTS

10 iO NASH 00

•5J 19 JANUARY 1967

Prepared for

AIR FORCE TECHNICAL APPLICATIONS CENTER

Washington, D.C.

2 JUNE 1967

By

TELEDYNE INC.

Under

Pr©l«ct VELA UNIFORM

Sp©mer«d By

ADVANCED RiSEAÄCH PROJECTS AGENCY Nuclear Tes» DeteeHen Qflffce

AI^AORierNo.624

BEST AVAILABLE COPY

LONG RANGE SEISMIC MEASUREMENTS

NASH

19 January 1967

AFTAC Project No.:

Project Title:

ARPA Order No.:

ARPA Program Code No

SEISMIC DATA LABORATORY REPORT NO.184

VELA T/6702

Seismic Data Laboratory

624

5810

Name of Contractor:

Contract No.:

Date of Contract:

Amount of Contract:

Contract Expiration Date:

Project Manager:

TELEDYNE, INC.

F 33657-67-C-1313

3 March 1967

$ 1,735,617

2 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 Re-

search Projects Agency, Nuclear Tesc Detection Office, under

Project VELA-UNIFORM and accomplished under the technical

direction of the Air Force Technical Applications Center

under Contract F 33657-67-0-1313.

Neither the Advanced Research Projects Agency nor

the Air Force Technical Applications Center will be responsi-

ble for inforn-ation contained herein which may have been

supplied by othei organizations or contractors, and this docu-

ment is subject to icLter revision as may be necessary.

TABLE OF CONTENTS

EVENT DESCRIPTION

INTRODUCT1.^

INSTRUMENTATION AND PROCEDURE

DATA AND RESULTS

TABLES

1 Station Status Report - NASH

2 Principal Phases - NASH

FIGURES

1 Recording Stations and Signals Received

2 Unified Magnitudes

3 Adjusted Unified Magnitudes

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

Maximum Amplitudes of Pn and P

Maximum Amplitudes of Pg

Maximum Amplitudes of Lg

Maximum Amplitudes of LQ

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

II (xi) Instrument Response Curves - LRSM

11(C) Instrument Response Curves - LASA

11(D) Instrument Response Curves - Other Svort Period

4

5

6

7

8

9

Page No,

1

2

2

4

DATE:

TIME OF ORIGIN;

YIELD:

MAGNITUDEi

LOCATION:

SITE:

ENVIRONMENT:

NASH

EVENT DESCRIPTION

19 January 1967

16:45:00.1Z

5.25 + 0.50

Nevada Test Site, Area U2ce

GEOGRAPHIC COORDINATES:

Lat: 37 08'37.0" N

COMPUTED EPICENTER:

Long: 116 08'07.0" W

GEOLOGIC MEDIUM: TUFF

SURFACE ELEVATION: 4764 ft.

SHOT ELEVATION: 3564 ft.

SHOT DEPTH: 12 00 ft.

ALL STATIONS

GEOGRAPHIC COORDINATES:

Lat: 37O03,18.0" N

Long: 116014'42.0" W

TIME OF ORIGIN: 16:45:00.6Z

DEPTH CONSTRAINED TO:

EPICENTER SHIFT:

- 1 -

0 km

13.9 km, S 45 W

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tkt O4 Qt Hi Qt Ck cu a> cu 04 o. o< o<

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INTRODUCTION

A long range seismic measurements (LRSM) program and several

larger seismographic observatories were established under VELA-

UNIFORM to record seismological data resulting from natural seismic

activity and a planned series of ü. 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 installations as follows:

Wichita Mountains Seismological Observatory (Wiso, Lawton, Oklahoma

Uinta Basin Seismological Observatory (UBSC) Vernal, Utah

Cumberland Plateau Seismological Observatory (CPSO) McMinnville, Tennessee

Tonto Forest Seismological Observatory (TFSO) Payson. Arizona

Large Aperture Seismic Array (LASA) Billings, Montana

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

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

VELA observatories and a preliminary summary of data reported by

other permanent and tempoiary 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, m general, data are recorded on 35 millimeter film

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

portable instrumentation has been incorporated which records only

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

tiguously 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 Tech-

nical Report 65-43, "Interpretation and Usage of Seismic Data, LRSM

Program." General information on LRSM van and portable system equip-

ment and operation is given in Technical Report 66-27, "The LRSM

Mobile Seismological Laboratory and 65-74, "A Portable Seismograph."

Copies of these reports may be obtained from DDC« The AD control

number of Technical Report 66-27 is 480343 All the observatories

have both long-period and short-period three-component instrumenta-

tion, in addition to their other specialized facilities.

Station information is presented in Appendix I, This includes

the station name and coder the geographic coordinates; 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 shown in Appendix 11(B), II(C]. and 11(D).

The procedures used in measuring amplitudes reported herein is

illustrated in Appendix 11(A) and the unified magnitude is calculated

as shown m Appendix 3(B) The distance factors (B) beyond 16 are

- 3 -

itKfcitafi;...«,»! imitä&m^ii

from Gutenberg and Richter*. or distance 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 relationship. An

additional magnitude for less than 16° was computed using a method

described by Evernden**. (Figure 3).

A standard hypocenter location program for a digital computer

is used to determine the location using data from all stations analyzed

Best-fit values of latitude, longitude, 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. This method is based on P-wave arrivals with depth con-

strained to zero.

DATA AND RESULTS (LRSM AND VELA OBSERVATORIES)

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

evaluation is shown on the Event Description page. The operational

status oi the 16 LRSM stations and observatories is given in Table I

and illustrated in Figure 1.

- 4 -

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

**Evernden, J. F., Magnitude Determination at Regional and Near Region- al Distances in the United States. AFTAC/VEAL Seismological Center Technical Report VU-65-4A, (1965), pp. 6, 13.

Table 2 summarizes the measurements made of the principal phases

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

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

ion and other phases as neen on the short-period vertical instruments.

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

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

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

fication, they have not been normalized to any magnitude. Fifteen

stations recorded short-period signals. Long-period signals from

this event were recorded by eight stations.

The unified magnitudes determined from the LRSM and VELA observa-

tories is shown in Figure 2. The average magnitude is 5.2 5 + 0.50.

The adjusted unified magnitude is 4.94 + 0.55 and is shown in Figure 3.

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

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

P, Pg, Lg, LQ and LR.

Attached to the report are illustrated seismograms showing the

signals recorded at four stations. The most distant station analyzed

that recorded NASH was NP-NT at a di^:ance 4363 kilometers.

- 5 -

rrinciiwl rhaasB

19 January 1M7 16i45ilXI.lt

Nina. Havada

m-WT Kanab, Utah

Dlatanca (In)

Tonto roraat Obaarvatory, Arlai

Uinta Basin Obaarvatory Utah

rranktown, Colorado

Subarray AO-10 Montana

wi ,-h'. t a Mo-jr. '.■ a' ^ Ojreivatory, Oklahona

Princo Gaorgo.Brltlah Coliwbf ., Canada

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where 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

Table of Distance Far.tn-rs

Dist (deq) B -»O 0 —

1 —

2 2.2 3 2.7 4 ^.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 3.5 26 3.4

Dist Dist

-J v^ .*- W J^C

Dist (dea) B (deer) B (deq) B 27° 3.5 54° 3.8 80° 3.7 28 29

3.6 3.6 55

56 3.8 3.8

81 82

3.8 3.9

30 3.6 57 3.8 83 4.0 31 3.7 58 3.8 84 4.0 32 3.7 3 3.8 85 4.0 33 34

3.7 3.7 60

61 3.8 3.3

86 8^

3.9 4.0

35 3.7 62 4.0 88 4.1 36 3.6 63 3.9 89 4.0 37 3.5 64 4.0 90 4.0 38 39

3.5 3.4 65

66 4.0 4.0

91 92

4.1 4.1

40 3.4 67 4.0 93 4.2 41 3.5 68 4.0 94 4.1 42 3.5 69 4.0 95 4.2 43 44

3.5 3.5 70

71 3.9 3.9 9976

4.3 4.4

45 3.7 72 3.9 98 4.5 46 3.8 73 3.9 99 4.5 47 3.9 74 3.8 100 4.4 48 49

3.9 3.8 75

76 3.8 3.9

101

102 4.3 4.4

50 3.7 77 3.9 103 4.5 51 3.7 78 3.9 104 4.6 52 3.7 79 3.8 105 4.7 53 3.7

Unified Magnitudes From P or P Waves n

Appendix X(B)

d ■ Maximum

JL

Bottom of line

Maximum

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/2" within 2 or 3 cycles of "c*

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

Seismic Analysis Diagram

APPENDIX 11(A)

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— DOCUMENT CONTROL DATA . RAO

• OMIOIMATIN 0 ACTIWITV (CaipMM* SBi

TELEDYNE, INC. ALEXANDRIA, VIRGINIA

|. HtPOmr TITLB

LONG RANGE SEISMIC MEASUREMENTS - NASH

»• nci>err »CUNITV e k*a«Fic*TieN

Unclassified I» ««OUF

4 OKtCm^TIVI NOT« mv* •( npMf Ml *M*M(M 4*<M>

Scientific i. AUTHonm a«»« MB*. Km» i

Clark, Don M.

, MM«()

«. WE POUT DATE

19 January 1967 •a. o»i«iHATo«-» NKPQMT NUMaanri)

184

• a. coNTnACT en «RANT NO.

F 33657-67-C-1313 »i PROJICT MO.

VELA T/6702

ARPA Order No. 624 ^ ARPA Program C.nd* Kr, ^Ri n

1«. A V« IL AaiLITv7UMITATIOM NOTICU ^~~~

This document Is subject to special export controls and each tranemittal to foreign governments or foreign national may be made only with nrinr anmvwal »f rhiaf aPTar

23 Tk HO. or ncri

2

** St?.MS?i?J''0"T "*•' '*"" '**"«-*"» •" a-r »a ..„0,*

II. SUPPf-MENTARY NO Til

1J ABSTRACT

It. SPONIORINO MILITARV ACTIVITY

ADVANCED RESEARCH PROJECTS AGENCY NUCLEAR TEST DETECTION OFFICE WASHINGTON. D, r.

An analysis of seismoJogical data 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 ,»1473 Sararity ClaniflcaHM

-UnclaaailiAd. _

Seismic Magnitude Seismic Travel-Time Seismic Amplitude VELA-UNIFORM Nuclear Tests

i. ORioiNA-nNo Acnvrrr- E«- .K. »WTRUCTIONS

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