IMMHiKII PMIII.IIJ II ' "' i^iPim. w^, -■■■■ " ^"-' M..^, ,.., , ,, — ■ "'■

r AD-A020 878

SPECIAL DATA COLLECTION ON SYSTEM EVENT REPORT. GULF OF CALIFORNIA, 8 JULY 1975

J. R. Woolson, et al

TelPdyne Geotech

Prepared for:

Air Force Technical Applications Center

19 November 1975

DISTRIBUTED BY:

KTOl National Technical Information Service U. S. DEPARTMENT OF COMMERCE

- ■-- ■ -■ ■ - ~ —_.^i^^^. - - -

w**i^mwwm^*~mi^*m^***^mmmivi rna.jj n i mm. ■•> ...— ., F — ^ '■ "• »■Wll I >«■

SOCS ER 75 31

00

00 o (M

a

05717S

SPECIAL DATA COLLECTION SYSTEM EVENT REPORT Gulf of California, 8 July 1975

J R Woolson. DO Solan. M S Dawkms. K J Hill, and R J Markle

Alexandria Laboiatonts

Teledyne Geotech. 314 Montgomery Street. Alexandria. Virginia 22314

October 197b

APPROVED FDR PUBLIC RELEASE; DISTRIBUTION UNLIMITED

Spon oreri By

The Defense Advanced Research Projects Agency

Nuclear Monitoring Research Office

1400 Wilson Boulevard. Arlington . Virginia 22209

ARPA Order No 2897

Monitored By

VELA Seismological Center

312 Montgomery Street. Alexandria. Virginia 22314

*>produc«d by

SP"nBfieM VA 22131

>D DC

- -1 —^».»■■■.-,—

II..I..IM,I<I üiiuiL.^ia.iiuiiiipnv^^^pr^^ppiWIlTinPr ""J- -"l—, ■""^SPB^ ■"■•'»""«wi^ninw"!

Unclassified SECURITY CLASSIFICATION OF THIS PAGt /»>i»n Data Enlarad;

REPORT DOCUMENTATION PAGE I REPORT NUMBER

SDCS-ER-75-31 2 COVT ACCESSION NO

« TlT^.E ranrf Subllllr)

SPECIAL DATA COLLECTION SYSTEM (SDCS)

Gulf of California, 8 July 1975

7 A,JTMOR(1)

V. olson, J. R., Solari, D. D., Dawkins, M. S. HU1, K. J., and Markle, R. J.

9 PERFORMING ORGANIZATION N tME AND ADDRESS

Teledyne Geotech 314 Montgomery Street Alexandria, Virginia 22314

l< CONTROLLING OFFICE NAME AND ADDRESS Defense Advanced Research Projects Agency Nuclear Monitoring Research Office 1400 Wilson Blvd.-Arlington, Virginia 22209

14 MONITORING AGENCY NAME • AOORESSr//dl'/aranl trow Conlrolllnt Olllcm)

VELA SeisDcloglcal Center 312 Montgomery Street Alexandria, Virginia 22314

READ INSTRUCTIONS BEFORE COMPLETING FORM

1 RECIPIENT'S CATALOG NUMBER

S TYPE OF REPORT • PERIOD COVERED

Technical

• PERFORMING ORC. REPORT NUMBER

• CONTRACT OR GRANT «UMBERC«! '7 F080606-74-C-0013

io PROGRAM ELEMENT, PROJECT, TASK AREA • «ORV UNIT NUMBERS

T/4703

It REPORT DATE

19 November 1975 11 NUMBER OF PAGES

17 IS SECURITY CLASS (ol ihit rapori;

Unclassified ISa. OECLASSIFlCATION DOWNGRADING

SCHEDULE

t* DISTRIBUTION STATEMENT (ol fhu Rtpntt)

APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED.

17 DI'TRIBUTION STATEMENT (ol lh» ahtrrar, »nl»t >d In Block 30, II dlllmren from Rmporl)

18 SUPPLEMENTARY NOTES

I1) KEY WOnOS (Conllnu* on ravane tldm II ntcumry and Idtnllly by block njmbu)

20 ABSTRACT (Conllnum on rmvt ia tidt II ntcinmry mnd Idtnllly by block number)

DD I JAN 73 1473 EDITION OF 1 NOV «S IS OBSOLETE ' Unclassified i uncxaasiiiea

/ SECURITY CLASSIFICATION OF THIS PAGE (Whtn Pml» Kntr

- ■ - ■ — - ■ - ■ --.... IMJ.I ■ ^ •■

■' i «an mimmtm nai i ^pf^^^fl^wpp^wmi imii ^ i ■"■■•■«, l mil • ■■! «..'- mu^^rmmori

- / -

3DCS Event Report No. 31

Gulf of California, 8 July 1975

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

Origin Time Latitude Longitude \

Ms

NORSAR 09:37:29 30 N 114 W 5,8 N/A PDE 09:37:24 29.6N 113.4W K/A 6.8 Hagfors Array, Sweden 0C:37:23 28 N 111 W 5.5 6.0

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

09:37:23.1 29.2N 113.4W 6.0 N/A

All SDCS stations were operational during this period.

Short period signals associated with this event were recorded at all SDCS stations and LASA. NORSAR data was obtained from their bulletin, the TAL transmission was not recoverable. The operating gains of the vertical and east SP channels at CPSO were unknown.

Long-period signals were recorded at all SDCS stations and LASA. Horizontal channel rotations were not performed due to signal clipping at all SDCS stations. The vertical and north LP channels at CPSO had unknown gains and the LP east channel was inoperative. NORSAR and ALPA long-period data appear to be invalid and are not included in this report.

Details of the program used to obtain vertical, radial and transverse long- period data at LASA are in the process of being reviewed. The vertical beam is probably valid while the horizontal beams are questionable.

Scaling factors on plots are millimicrons at 1 Hz (not corrected for instrument response) with the exception of LASA. LASA SP scaling factors are millimicrons per inch.

r .. s ;■•

»T« I .• ;• <m / V ■ MfM ^ • Ü

. ■ - • _...

. ;

fi- mam

i L - -

j.iijpki^iwi. jf umim^pi r r ^ **W1'**lm'w*l*7Wm&<irr •mm^mm™''}"

Z O >—i

H O. t—i

oc u t/5

a

< H in

a o >—i

et UJ a.

o u '-' z HO

u =5 CS DCO H"-

Z Ui m a.

i

H cc o 2:

z o to H UJ <H

UZ

W

t/3 UJ H < Ü5 Z U tat UJ Q 1/3 Di o o u UJ UJ Hea •-< t/}

z o H < u o -J

>X >X

o o Kl

Kl

o c

-1 _J

t/3 tO

O e o

M M

<U lO o o c in 1-- 1-^ 00

o e ri M

t/3 tO

LO O o o r 00

00 00 r-i r \ t-. r 1 r j r i r \ r t _i _i _; —1 t/) tO t/3 tO

c o z

> ■ O u O 00 ^1 O ^ LT) O

K3 tO M

O r-l

m

o o Kl 30

to X

o e t^ 00

K;

u-i

o f-H

1^

Kl 1—I M

Ol t-- ►o Kl

K, LT.

00

Z»

o o c o 0 »o

Z S Z X Z 3S Z 3:

^ m 00 00 CO

I-H to 00 r^ 1-1 r*

Kl ,,. «r o

K3 K3 N O tO K>

^H K3 a> CT>

LO lO 00 O) K) 00 K) C^

O O ^r o

o

Z UJ

»r 10

IT) \0

O O

o

Z» Zi=

00 CO

OO — rt n P-I «r ~

OO —1 00 tn ^ -t in

OK) o *r

o •-"

M • •H

(Ü C fH •H

rH 01 • 00 K

.H 4> c ^- IA * > </) •H "^ u rt c

ca B w rH > c c 0 ^ C (U M •H fl «j a> w •H C C 4^ •H ♦J lH c « Z c n (/> ^H C 3 -^

i-H U dl I» a» .., 0 0 « < Z H UU» ca f X l

Ix

0» l- •^ o « z

(fl 1*4

n

o: O

in h O

O X

o c 4-> O

•■H ^ X 3

« UJ UJ

< D ^ < UJ 3S

< to

z 0 >-

c-i O a (0 t to 1 ac 1

t/3 U 3 ti. z < z 0 M £ < ( J E J X z ■ !*

a> n X3 c

0 O » r-<

♦-J C 4->

O ■/,

-c iH O 0 4-1 3 E ra ar 3 4-" 'y, O 0 t^ ■ £. rt

>. M • M

•^H

!/, e

S &fiT3 C C

1 ■^H M z -a u. ^ £

O 4-1

4-1 u 3 rt II E

t- ■ --

tfi 11

4-J 4J M c c 01 0 ui e > • *4

3 « J= 1- 1—^ 4-<

*-> IA w O c ♦J 4->

•H ■ T3 -O

^H • « 1—1 u

•lH M c TS u « ra •H »-> u ^- a>

•H (4-1

ti a a» X e 1-

4-1 0 'X,

IM c • ^ 0 0

C T3 -a tj 0 0

•■H ir, E 4-" rt U a £, 0 *-• IM c 0 ^N

u LO O •r-t .c1- »- + 1 0 II

O (- u ^0 0 x <-> x. H K) s

5

L aMU

fWWi—rr-T»—ww-»w w^^pp^pi^r-. .—«"-»r-r-^WlP—-T'-PW- 'V'" '*" ' "K" mnpfprnapmpHimmpnppv "^"■, '"■'", "^

\J -

HYP0CEN7ER DETERMINATION

TjiptJT F"P ETRNT 8 JÜL 75 oc;??: 20.0 28.099« 113. 000« OF»».

PES '.COALS o: ST. »2. STA. AFRTVJL CMC REST PEST PE?T i»r 09 41 37.8 0.5 0.6 18.3 1^.9 cpo 0° U2 ai.i -0.3 -0.0 2a. 3 6^.6 PF-ON 09 a? 51.U -1.0 -1.« 26.2 29.0 FN-MV 09 ü3 28.? -0.2 -0.1 2°.5 62.f WH2YF oo U« 13.ü -0.3 -0.1 3U.7 3ü1.e HN-flE 09 UU 52.U O.fl 0.6 39.2 51.6 HRP 09 a« 31.1 0.6 0.3 79.5 2a.3

f HFPRIN TRAVEL TIME TABLES

ORIRIN 1A7. LONG. DEPTH (KM) SPV IT ST» Ottl^tSI.I tf.«1W 113.28^1» 49. CHIC 0.6 3 "» 0o:?7:23.1 29.192N 113.aCjv 0. PEST 0.7 3 ^

CALC 1 . 2

0 . 1 0 0. 2 1

0 0. 0 0 0 . 0

0 . 0

REST 1 . 2

0 . 1 0 0. 2 1

0 0.' 6 6 0 . 0

0 . 0

CHI2 cnVFFRf,» ELLIPSE; 95 »EP CENT CONF..LEVEL, SDV= 1.»1 HAJOr ''a.OKW. HINOP 35.8KB. AZ= 30 APEA= 832a SQ.KH. FEST

atMIIIManiMMtl I ■■ III '' ■ ■ ..~—*-A .

"■»"""■ ' ^t^mmmfu^iimtf i ii i »Mi« J 'IJWWI '^w^ww,^w^^»«!(w»"p^ww^w«KPipp

-V -

DATA SUMMARY

TNPOT Nt3^t2f»i 28.098N

8 JÜL 1i?.000B

■7C

OKI.

ItBXfil STA^ PHASE 2IÜI IJ!ST__P2£ A/T..

HAGNITnOE (IB NS DIP

IAO f CPO RF-ON FH-B? MHTTK HN-HI NAC

EP »P JP

L'P EP EP EP

0« U1 37.6 ?AB 0? «2 U1.1 SPZ 09 «2 S^.U SPZ 09 U? 20.3 SPZ 09 UU l?.a SPZ 0° «U 52.U SPZ 0° tt9 31.1 AP

1.6 0.0 1.1 0.0 2.3 1.2 1.5

120tt. CLIPPED 17«*t,

CLIPPED 5?6. ?Ü8. ■»oo.

5.7K

6.?f

6.13 5.tt9 ?.93

±111-

li.i

7f .2

I»." 3C.2 TO C

OPTGIN 09:37:31.1 09:37:23.1

LAT. 29.tt15N 29.192N

ICNG. 113.282W 113.Ü03W

DEPTH (KM) ÜO. CALC 0. fvn

HAG c.98 :.9«

SDV STA

0.37 t

Short-reriod magnitudes 'mb) used in averaging are restricted to those recorded at distances betveen 20 and 110 degrees from the epicenter.

■ ■ ■ ■■ - - -—^■»—^ ■ - -—-

- "'» ^» iiBiiliiip la^ «wvwwpwywp^mi ii| ui ■ A^pi.. I W ip ^^WV»V. ll^l|IJiHVm|nHi,^l|ll«IV,P«^.>JF^«

I i

8

M

->-*~^-- • *-'"— -

«« - M

i ii ii.-tä^fcjiMMtMÜMfc MürtilMHn ii ■

ivnpnmppiM miup niwiim i i i i i «i vmmmim*wf*

£ -

•iPia li iiupp . i 1 n

l

S

M 7 M M

L^ --— - -—■ ' — - -~- ■it^a^^MMMM*.

—■' "■,""1-■ " '" lipi.mpi» .. ^.M^uiMiiwui i»p IHP^.III».I,.I ,IMIJ«HI*.-.I ■ ■ 'mm^mmr**^*~ uiim. m

-7-

m

■

.

w» m V)

i- 5 Q. «» M «a

iHB« IrMMBA^^o. MM! ■Mt^^M^^ata»

■ II «lull ■! 'I »■■

■I IIIWI •■UP * mi — -- ■ I^IW i^p^MWW^^V

-y-

CM

u ui (A

IS-» N to M C.

■ ■ ' ' "i"" •~m*mmmmimfmiiimiiiifm',wm**' »"^ 1 ■i<v<VWIl^«P'J|J>l»-<liJi

-9 -

m

cJ "»

u

_J

N 2 O. ^

(A S;5

■■an——rtmi in ■—MB^III ——— - — -- — - "•-- ------ ■■ '-'-■—

piij i HJMIIHH ii ii . v .^luiimj^w.ii IM n ■p^w?>!WWf^p^(^"F"|.|ll,i|fp(Hl )wr.-.T^ .1 „u iiiiiiiia.iij.M .ii..Wi.i|iiwi iii^nR^Mppjji {||.iii|i iiiiipii j!

/Ö -

15

z

>■

CJ o

•MM^MMMli^aM^a^^BMH ._ _— I a ^—tjaHMMM-. , ||

m mil i u ii p i, < »i» ■niaiiii ] . >« in nm^mv^wqi^TCi^ii i ■■■ i ü — . i .Hin iii4j:Miiiiiii.ii i . KIHIJ . ijpi^wmpatnIIIII.I i ii.>ii«iii«iii i, ,», i — i umii ■» in ,11

in

CO I

o

//-

ra

13

:?;

s I

->~^J—— ■ - - - ' - ' ■ ■ ■-—'-"^ "-:- '

lun.iiMjwiiww. ^.m'*y**mmi!mKii'mv!'.mm****mmmimrGm*mm^i —' "'■ •"»■■"•" vuj>m-> mm i ..mmim^y^jm

- /Z'

If*

I I

■-- ■ ■ ■ ■——»-—*—«——-^ - ■

" .' !l""«^»!B^BPf«l)W IHII-I-H."HIWN1 1. »•>!■■■." II-..H ■ Piu um iiniinu aiiina mp^pipqip

-/3-

m

>

I A \

K

*- '

..

■. ■

f n .

±- j r

"A

n \

r X- \

t —

L _Jrr^ ,:

F

L £

rr

:

■

: h /

<

i 1

1

El i

■iiifiijiniiiifli - r ^■— -■^-^—^»■^■•^■-- ■ -'■■— ■■ .._. -. in iw MH- -■■■—' ..,—^. .u.*.--«^-

I.lppli mmmmmmw p~w^nmFvmwiinen^<>mv>,P"l> «»JU ^ ■ ■ MUI MUMPI i^BKrrwtwF^mBwiw1'. ii'ii.i ippmnpiwin"'1! "iiiim

-/v-

zrr

\ / \

£ \

•~~

\ /' \

c \

' \ |

~~^ (!_ '

/ ^

-■->■

c33

;—s

15

%

s

> k '

\ s!

i M

!

^^MM^IM ———^—■- ■- . .^«„j^.

«PI«1"11 •" -vapvv«v*w^w^p*va^pvvn«^iOTWinHnpiviniM«PH>p .... ■ i nn - ww m^ym*^m

-/5; -

m

Ui

a

*,*^ii**'*a—■ ■ ■ -.- ——^^iiigiii iiijai^i^iüiigiiiiiiMi^ n n ■-■^ ■•- ■ , N»M■«■■üMMÜfcaaMii^- -— -'- ■

?w"—^^*vir?*ri*mimm!imfiim*iiw**f*'i*lF**i^^

-/4-

31