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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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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
•n M 6PT
Uf
LPZ
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XXX
•raa (as*) LPE
Principal Phases - NASH Table 2 Page 1
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unified Magnitude:
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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cat. .his BÄSte ÄÄTWiÄ,0 ,he p,,b'le- i"dl- U SUPPLEMENTARY NOTES: UM for addi.iona. esp,«..
11 SPONSORING M!LrTARY ACTTVITV. ■•- ...
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b. ■££&& dE:,c,5:,i,«h^1!j:,o?s,r'tio' c,"",,ted«»» or-auo« in th. p.»,»,*. «p^,«,^ „ (TS)i w, fc.^., w
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«ars, such .. SSÄffäirtSSÄlHa!**1" ,,,«"U- p«j~t cod. sS^iZitefcl^A ,^<,• "•■•• ■iUt"' words but »ill be foUo«*^ ..T^i ,./B,,,' f U,e'1 « ''•' t.«t. The a..lpj;",7f lnSs^uÄ? rÜ?" »f «•ch"'"l con- B ent oi link., nil,,, ,„,, ^ym lp o^i,,,,,,
unclassified Security ClaMirtcaUon
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19 JANUARY 1967
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