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UNCLASSIFIED
AD NUMBER
LIMITATION CHANGESTO:
FROM:
AUTHORITY
THIS PAGE IS UNCLASSIFIED
AD803760
Approved for public release; distribution isunlimited.
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
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MAif iEÄK
m mMS lANGi SfISMIC MEÄSlÄi^ÄNTS
HALF BEAK 00
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BEST AVAILABLE COPY
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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
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BLANK PAGE „^—„„ i .
.
iiimiir iTijijiT'T"-
mm
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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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»utMrrcy M>-10. nsntCM
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aadlf. »oath Dakota
»innar §««11 Dakota
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Jrapar. »Ifcort». Canada
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Station Status Report - HALF BEAK
Table I
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E I
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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 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 -
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. .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.
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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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38.7
11.3 SS.2 >3.3 is.a so.« 39,9
B.IS* 3.96
M,l 54.1 M.l 40.0* 40.0* 40.0* 45.1 54.8 7.«3 4.75 1.075
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340 340 340 53.0 S1.0 70.0 70.0 27.6*
1.9
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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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1.0 1.2 1.3 1.0
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(2.1) (16.0) 17.0
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51450
10369 3787S 34332
1838 :}:u
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3135 162 5 5161 4934 6013
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945
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360 734 437
(135«) 447
(3««) 1937
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3386
341 730
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(938) 470 340 195 335
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(173) (195)
7 30
1335 33 36
591 1581 1363 (651) 585
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■3.7 337 487 445 410 391 357
(1036 (1177
472 (314 963
ATM (— I LPS
Principal Phases - HALF BEAK
Table 2 - Page 1
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HALF BEAK MAXIMUM MOTION
VERTICAL COMPONENT
DISTANCE (km)
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Figure 4
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DISTANCE (km)
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Figure 8
-
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Coda station )iatanca
(knl
c-ojraphU iatituda
Oao«ra|*U Longltuda
Elav. _ (km)
Computad
«111. Sta.
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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97.6 K 5 <
139°
HALF BEAK
SV3QD
SCHEFFERVILLE, QUEBEC
30 JUNE 1966
A = 4187 km
! ,SPT- HI '
102.3 K UP
'LPZ-HI ■ I 1 3.87 K
3.88 K
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HN-ME
HOULTON, MAINE
30 JUNE 1966
A • 4073 km
UP «—22:21:29.9 Z • SPZ-LO' ^
35.9 K ^»MWKWMMII»!«»1*»»
' SPR-HI
93°
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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
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