/

cJ T knica i y^p^

SPECIAL DATA COLLECTION SYSTER/HVENT BEPORJ

NTS Event vP00L/1 17 March 1976.

M/HJII. M.S./Dawkins^aM M/b/^illispie IIM| Alexantfrta -taltirffrbries /

Teledyne Geotech, 314 Montgomery Street, Alexandria. Virginia 22314

June 4876 7 APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED.

Sponsored By

The Defense Advanced Research Projects Agency

Nuclear Monitoring Research Office

1400 Wilson Boulevard. Arlington . Virginia 22209

F^U: . ' V C" Oöi t yyW* 0rder«X2897

VT/^n Monitored By

VELA Seismological Center

312 Montgomery Street, Alexandria, Virginia 22314

D D C

4054<Oi ;,r

»

Dnclimi HK&H it» DtlaoH Utmf4 NtMiick Pxncii *t*"c* »•• *• AM fun T«lMiti( Applictimn CMMI »ill to iM»«n*li Hi mltimttm» ctntiMt« ton« «kick tot to«« uwhri to «ito> «>|i«u«i'««i ti cwlrttltn. ««4 Ma tecMMnl ■ wkKct I« l«i«i ■«■■■M «• n«« to ««CMMIY

Tto ««Mt uit cmckiiMiii »inMM< •■• ikn« «I ita «utoit ni ikuM MI to mmifnmt •• MCMUO«» itpmmini tto «IIKWI ptlwai «iikti

tipm—t «i aiptoi «I Ik« 0«l«nt« *4>««c«4 lUintck P>«I«IU A|««cy Ik« An FMCI Tickmul AwtoMMB CMMI «r tw Ut Ctniiwi««!

SECUwiTVC ""sSlVi. ATTON OF THIS P«OF ,m,.n f.... fr<"'ä)

REPORT DOCUMENTATION PAGE I Bt PORT NUMBFB

SDCS-ER-76-91

? OOVT ACCEiilON NO

4 TlTLf (*"<! SuMllloJ

SPECIAL DATA COLLECTION SYSTEM (SDCS)

NTS Event "POOL", 17 March 1976

KKAt) INSTWUC TI'-N1. BF.FORK roMPl.KTlN'. HOWVI

) REClPlEN T'-, r »T «l ','> K /MH( M

S TYPE OF PI «>OPT « UtUl',r, '.'< /I ►•'

Technical 1 pCRroBMINO o-r, B r POP ' •< JM « ' "

7 AllTMOP'

Hill, K. J., Dawkins, M. S., and

Gillispie, M. D.

V PEBFORM1NOORC,»N1Z*T10N NAME »ND ADDRESS

Teledyne Geotech 314 Montgomery Street Alexandria, Virginia 22314

"J CONTRACT OR OBANT N.jMHff'«,

FO86n6-74-C-00I3

10 PROGRAM Et EMENT PROJF'T '»•,•■ AREA * WORK UNIT N iMRF w.

T/47n3

n CONTROLLING OFFICE NAME AND ADDRESS „.„„„.,

Defense Advanced Research Projects Agency

Nuclear Monitoring Research Office 1400 Wilson Blvd.-Arlington, Virginia 22209

14 MONHOBING AGENCY NAME i AODmtiSOl *""->< '"" Con.ron.r, »mc.J

VELA Seismological Center

312 Montgomery Street Alexai ria, Virginia 22314

12 REPORT DATE

May 28. 1976 I) NUMBE» OF PAGES

IJ SECURITY CLASS 'nl Ihf "pr".

Unclassified

Mm DECuASSiFiCATiON DO«"'.BAO'«.', SCHEDULE

"». DISTRIBUTION STATEMENT (ol thl» Htpott)

APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED

U DISTRIBUTION S^^ENT fg i 5 ^SK ".OC* iU, H 0*0* *~ *•'*">

I« SUPPLEMENTARY NOTES

„ KEY »ORBS FeSSS ^ * " "•"""> a ","""'» ""* '"J,"b•"

JO ABSTRACT fCanllnu» on ;.«».• .irf." o.c..«^ •"<« "*•"'">'»" »""■* num',*';

_JJ FORM ^yj EDITION OF I NOV ^S IS OBSOLETE Unclassifie■, SECURITY CL AiSlF1CATiON O r TMIS PA&r »*»" ''

SDCS EVENT REPORT NO. 91

NTS Event "POOL", 17 March 1976

This event report contains seismic data from the Special Data Collection System (SDCS), and other sources for the iobevc event. Published epicenter information from seismic observations is:

'P" Arrival Origin Time Lat. Long m, M

NORSAR 14:26:32.1 14:15:04 38 N 115 W 5.7 N/A Hagfors 14:26:40.5 14:15:03 38 N 116 W 6.3 4.6

Using SDCS stations, LASA and NORSAR, the epicenter location and magnitudes become

14:15:01.7 37.3N 116.3W 5.8 N/A

The programs used for LASA, NORSAR and ALPA data recovery are pre- sently undergoing modifications. Information for LASA short-period is reported from their Teleseism Event Report; NORSAR short-period data is obtained from their bulletin. The long-period array beam recovery for those stations will be resumed upon completion of these modifications.

All SDCS stations were operational during this period.

Short-period signals associated with this event were recorded at all SDCS stations, LASA and NORSAR. All SP channels at HN-ME had polarity reversals; to correct this, mathematical inversions of the data were performed. Horizontal SP channels at all SDCS stations were rotated.

Long-per channels matical the LP c operatic The abse to a mat spikes.

iod signals were recorded at all SDCS stations. All LP at HN-ME had polarity reversals; to correct this, mathe-

inversions of the data were performed. Operating gains of hannels at RK-ON were unknown because the calibration and n db settings could not be determined from the station log. nee of data on the LP horizontal channels at RK-ON is due hematical zeroing process used to eliminate numerous noise Horizontal LP channels at all SDCS stations were rotated.

Scaling factors on plots are millimicrons at 1 Hz (not corrected for instrument response).

A s

/

Q c —> > X !»• IJJ '** "x. > z >• JM

o: UJ o O C o < U o <u o o o o Oi o —( rj O LO o o m o —i r i FH r i

Z ' ro n IS O a e o o o i- 1 r 1 f 1 M

o o ■—( J _] ■D UI r 1* LO r J ~-i .-; ^H 2 M m ir. r^, 1 ac m t oo LO CO to u. H O u-. u 1

» c C 0 0 -H

STRUMENTA

RIOD L ^ a

0

> X

i :• in

Rotati

be quest

U'. tu tl — a c O LO o C- o O e a t/;

i o 00 r-1 e ,—< o t—« c c rr ■

H z ^f LD e tfl o 'S. M Kl — >i

2i vD I» e T* si. X ee ae m t/5 (0

rn en — — •H i t/5 CO

1 2

cordir

h and

z 2 o tn 4J

(D 4J U 0

E 4J -H o M a:

<-~ H Ui vO -T O »• K) CT> o w H < H «SJ t i—< t ^^ t c m (0

ata (ever

o this a2

«—i

U

Q

vO in c. r ri Kl Kl cr. -t-1

c

y. 01 CO -M O

<

w H

z u

Z 2e

o o • •

Z fe

•r tn

Z S

o o

Z

o e

Z JC

o c Z (U

»T in

Z J:

O Q •

Z

o

~2

a

•pi

>—i

r3

■ical

jnced

j— i-i UJ o vO ■H M 00 r 01 o to cr. in A O O ^1 r i *^1 LT Q m

OS o z

o Nl *r PH m -T p-1 r I T c rj in rj N -T cr "^1 •H U

^t »r LO ^r N O —1 to 91 c c. cr. o O r-t oc u

0) 0 o S 1-1 •*• to to to to T 1—1 e in * -T m »r -r in

0>

C3 U") r- m tn 00 CTi a vC A t c o O tn O -T JC b LU PL] vO ^f to 00 to r» •* o T ifi vO pi in CTi fi Kl ■P c

•—i o o r-H e O o p-t u.

0 i/l •PH

en O TI 0 -

B W "O O (T3 0)

•H XI E

id -U M • ■H * « o 0

o C o u in IM

§ 1-t * M

^ p 1- c o

1—1 •H a> c l- M •- •• 11 O •H a H > </) •r-l •PH oc a c U .M O JJ M o

< cd C in rH I-» c c o i) >. RJ «H o vo 0) •

u _-: C (U M ■** rt ♦-I v .-( « -J U II C i-H Wi (1)

o in HH C c «J r-i *-> 1—1 c —i i re ^ o 0 0 p-t

_J « s: c CTJ in f—< c 3 •ri o 1~ •a »J ■PH M s: Q) X XJ

^^ (J V h a» •FH o o « f« o <b c -C 3 H ua ? fl < S H uu 2 03 3E r y. us z M O i >-■

■"

4J 0

tt »-• uu ui s; UJ < z -«: H Q < O < Zr (/] O >> M O a to ■ LO 1 K ( r 1

to U »3 a. SB < Z O M i < u u- -J S z a:

HYPOCENTER DETERHINATION

m INPUT FOR EVENT 17 WAR 7f

1S:OO.n 37.000M 116.r00H OKfl.

RESTDUALS STA. LAO RK-ON CPSO WH2YK FN-WV HN-HE NAO

ARRIVAL lU 17 53.6 Hl 19 U6. 1 lU 20 24.1 lU 20 38.0 1« 21 01.7 1U 22 C9.3 lU 26 32.1

CALC -0.1 -0.1 -0.0 0.2

-0.2 0.6

-O.U

REST 0. 3

-0.5 0.5 r.5

-0.1 0.2

-0.P

DIST. REST 12.C 21.1 2tt.7 26.3 2fl.9 36.7 73.2

AZ. REST 35.U U2,8 PU.5

339.2 76. 1 60.U ?a. i

67 HERRIN TRAVEL TI1F TABLES

ORIGIN lU:15:10.1 lU:15:01.7

LAX. 37.531N 37.275N

LONG. 116.115H 116.3C7W

DEPTH (KPI) 53. CALC 0. PEST

SDV 0.3 0.5

IT 5 H

STA 7 7

CALC 1 . 1

0 . o 0. 3

0 0. 0 0 0 . 0

0 . 0

REST 1 . 1

0 . 0 0 0. 3 2

0 0. 0 0 0 . 0

0 . 0

CHI2 COVERAGE ELLIPSE; 95 PER CENT CONF..LEVEL, SDV= 1.6Q MAJOR 61.6KP1. 1INOR J7.9KH. AZ= 31 ARFA= 7339 SO.KN. REST

DATA SUMMAKY

INPUT FOR EVENT 17 UHR 78 1U:15:00.0 37.0nON 116.000W OK«.

ARRTVAL NAGNITODE . IinE INST PER A/T.

LAO EP 114 17 53.6 SAB 99.9 9999.

STAi ?HASE TlflE IN2I._PEP A/T___np IS DIR DTST

21.1 RK-ON EP 1U in 46.1 SPZ 0.7 1P56. 6. 10 RK-ON LQ IÜ 27 36.0 LPT 12.0 9999. RK-ON LR la 20 34.0 LPZ 13.0 9999. 0.0 CPSO EP 14 20 24.1 SPZ 0.8 648. 5.96 CPSO LO 1(4 28 41.0 LPT 15.0 1151. CPSO LR ia 30 17.0 LPZ 13.0 1656. ^.73 HH2YK EP m 20 38.0 SPZ 0.9 171. 5. 36 HH2YK LQ m 2P 46.0 LPT 19.0 4 86. WH2YK LR 1(4 31 53.0 LPZ 15.0 805. 5.44 FN-WV EP m 21 01.7 SPZ 0.8 73. 5.16 PN-WV LQ m 10 54.0 LPT 16.0 804. PN-WV LR 14 3 3 00.0 LPZ 14.0 1125. 5.63 HN-HE EP 14 22 09.3 SPZ 1.3 1371. 6.37 HN-HB LQ 14 34 58.0 LPT 20.0 286. HN-HE LR 14 37 53.0 LPZ 13.0 220. 5.03 NAO EP 14 26 32.1 AB 0.9 171. 5.82

ORIGIN LAT. LONG. DEPTH (KH) HAG SDV STA l«: 15 :10.1 37. 531N 116 .115W 53. CALC 5.58 0. 41 5 Itt: 15 101.7 37. 275N 116 .3C7H 0. REST 5.79 0. 46 6

HN-ME NOT USED IN CALC RUN SP AVG. HAG.

Average Ion«-period Magnitude (Ms) is based on Rayleigh wave observations in the period range of 17 to 23 seconds per cycle

21. 1 24.7

24.7 26.3

26.3 28.Q

28.9 36,7

36.7 73.2

c

c

CO r- az d

r-

o o

CM

o i

-.' oz

>

-^

u UJ

r 00

0- en en —

O)

rr ^ ü- in en ~

CO

Q- o en to

n i

CD

GC CL :•

r

UJ en

i "0

CO ^

'O LO

Ed CO .- CD UD

LÜ

CD

ÜC r

■.

CM :

o o o

'3"

O Ui If)

:■

< > i J

CD —

D >

oo

ft. oo CO rr

:•

CD

QC cr

i

3

t- :

Q- J. CO CD CO rr

Q I- w

cn ^

CD ■• r- • b

nr ^J

T OJ

•

LU

I

;

/

■

I- H

d

c

C

u UJ Ü5

:•

'

CTJ in

o o

Q- o tn to

Q- oo CD —

«a- rO 00- CVJ

CO r-

T

Z o i

QC

•■■j

i ^5 ^5

o

4

o

■t

D ^J 57 21

J1 tf1

in ^H

a a o zr

N DC o Q- f\ Q- s _J ID _J ^

oo 3«

_j in

a,

CD

r CE

r-

>- (M

I H

r 3 =3 2:

r- o

_l ^ _J M

s a

00 I— B

LU

Q

■• !• i

■:

■i' ■

! a

-

I

I -i

S a

J

o oo

I 1

U3 QO

D ■—"

I— fo a_ to _J 9"

UJ

Q O

.IT) to ■1

Lf) i3

rsl en Q- a; _J CD

CD CO

__ a

Q_ en _j in

oo o

c in

^