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AD-A022 548

SPECIAL DATA COILRCTION SYSTEM (SDCS) EVENT REPORT, NEAR COAST OF NORTHERN CALIFORNIA, 7 JUNE 1975

K. J. Hill, et al

Teledyne Geotech

Prepared for:

Air Force Technical Applications Center

21 January 1976

DISTRIBUTED BY:

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

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097157

SÜCS ER 75 65

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SPECIAL DATA COLLECTION SYSTEM EVENT REPORT Near Coast of Northern California, 7 June 1975

K.J. Hill, M.S. Dawkins. R R. Baumstark, and MO Gillespie Alexandria Laboratories

Teledyne Geotech, 314 Montgomery Street, Alexandria, Virginia 22314

January 1976

APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED.

Sponsored By

The Defense Advanced Research Projects Agency

Nuclear Monitoring Research Office

1400 Wilson Boulevard, Arlington . Virginia 22209.

ARPA Order No 2397

Monitored By

VELA Seismological Center

312 Montgomery Street, Alexandria, Virginia 22314

REPRODUCED BY

NATIONAL TECHNICAL INFORMATION SERVICE

U. S. DEPARTMENT OF COMMERCE SPRINGFIELD, VA. 22161

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Disclaimer: Neither the Defense ^dvinced Research Projects Ageicy nor the Air Force Technical Applications Center will be responsible fo- Information contained herein which has been supplied by other organizations or contractors, and this document Is subject to later revision as may be necessary. The views and conclusions presented are those of the authors and should not be Interpreted as necessarily representing the official policies, either expressed or Implied, of the Defense Advanced Research Projects Agency, the Air Force Technical Applications Center, or the US Government.

Unclassified SCCUAITV CLASSIFICATION OF THIS PT,e fWh»r> Dmlm En„r»d)

REPORT DOCUMENTATION PAGE I. REPORT NUMBER

SDCS-ER-75-65

2. GOVT ACCESSION NO.

READ INSTRUCTIONS BEFORE COMPLETING FORM

3. RECIPIENT'S CATALOG NUMBER

« TITLE fand Su«>""»J

SPECIAL DATA COLLECTION SYSTEM (SDCS)

Near Coast of Northern California, 7 June 1975

7. AjTMORr»)

Hill, K. J., Dawkins, M. S., Baumstark, R. K.y and Gillespie, M. D.

i. TYPE OF REPORT ft PERIOO^^JW^EREO

Technical

t. PERFORMING ORG. REPORT NUMSER

uL Y CONTRACT OR GRANT NUMBERfU

F08606-7A-C-0013 l^"

9 PERFORMING ORGANIZATION NAME ANO ADDRESS

Teledyne Geotech 314 Montgomery Street Alexandria. Virginia 2231A

11 CONTROLLING OFFICE NAME AND ADDRESS

Defense Advanced Research Projects Agency Nuclear Monitoring Research Office U00 micnn Rlvd.-Arlingfnn, Virginia

10. PROGRAM ELEMENT, PROJECT. T»SK AREA ft WORK UNIT NUMBERS

T/A703

12. REPORT DATE

21 January 1976 -zr

1J. NUMBER OF PAGES

18 ^ST^^^GENCY NAME ft AODRESSf,/ d.«.»n, »on. Con.roIMn, Off.c.)

VELA Seismoxagical Center 312 Montgomery Street Alexandria, Virginia 22314

IS. SECUF'ITY CLASS, (ol IM» r«poffJ

Unclassified

it« OECLASSI>ICATION DOWNGRADING • ' SCHEDULE

I« DISTRIBUTION STATEMENT (ol Ihlt Kmporl)

APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED.

17. OISTRIB UT.ON STATEMENT (o, ,*. .t.n.c, .m.e.d »n Block 30. II dill'"*' "om R.porO

18 SUPPLEMENTARY NOTES

19 KEY WORDS fCon.lru. on ,.*.r„ .id. II n,c,...ry «.d Id.n./fy by b.oc» numb.r)

10 ABS TRACT rCor./nu. on r.v,,.. ..</. II n.c...,n, •"- Id.nUly ty bloc* numt.f)

(JO . jST« W3 EDITION OF i Noves is OBSOLETE Unclassified J N . SECURITY CLASSIFICAT.ON OF THIS PAGE f»*." ".<' »»<""<'

SDCS EVENT REPORT NO. 65

Near Coast of Northern California, 7 June 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:

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

NORSAR 08:57:48.0 08:46:24 40 N 124 W 5.5 N/A IASA 08:49:44.2 08:46:10 39.IN 124.3W 5.8 N/A Hagfors 08:57:56.0 08:46:56 45 N 118 W 6.1 5.8

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

08:46:21.8 40.6N 124.0W 5.3 5.5

All SDCS stations were operational during this period.

Short-period signals associated with this event were recorded at all SDCS stations, LASA and NORSAR. Horizontal SP channels at all SDCS stations were rotated.

Long-period signals were recorded at all SDCS stations, ALPA, LASA, and NORSAR. The LP vertical instrument at HN-ME was not responding properly. Horizontal LP channels at HN-ME, RH2YX, RK-ON, and CPSO were rotated. Signal clipping at FN-WV prevented rotation of the LP horizontal channels. Validity of the ALPA, LASA and NORSAR long-period vertical beams is questionable and horizontal beams were not included because of program recovery problems.

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

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INPOl FCE EVENT Ce:'46:10.C 39.100N

HYPOCENTER DETERMINATION

7 JDK 7? 1211.300« OFM.

ST». IAC HH2YF FK-CS CEC FN-WV fiK-HE MAC

ÄFFIVAI 08 49 mi.2

!1 El 52 5 3 5« 57

06 C8 08 08 C8 08

09.5 26.7 36.3 07.6 01.1 48.0

FESICDA1S CIST. A2. CA1C FEST BEST PEST C.2 0.8 14.3 58.7 0.0 0.8 21.3 345.1

-0.9 -1.9 23.4 53.8 -o.u c 30.5 86.9 -c.c 0.2 34.1 78.6 1.2 0.5 40.4 62.8

-0.1 -0.9 72.4 21.4

67 REEFIN TFAVE1 TIBE TAE1ES

CFIGIN 1AT. 1CKG. DEPTH fti) £EV IT STA 08:46:35.2 41.1C8N 123.568« 82. CAIC 0.6 4 7 08:46:21.8 40.574N 124.019« 0. BEST 1.0 3 7

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CHI2 CCVERAGE EllIESE; 95 PEP CEK1 CCHF..IE^EIr SDV= 1.64 HAJCF 78.2KK. HINCF 33.9KB. AZ= 29 APEA= 6333 SQ-KH. FFST

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DATA SUMMARY

INFOT FCF EVENT 7 JOB 75

C8:46: 10.0 39. 100N 1 24.300W OFN.

ABBIVA1 RAGNITDDE

5T».i asm. .—— .Ilfl .IJ!5I. ill 111. B .-.B5— .SIR .DIST_

1AC R ii 08 49 44.2 AE C.8 Vil, 5.41 14.3

IAC IR 08 55 33.0 IFZ 17.0 1516. 5.45 14.3

iR2lF EP 08 51 09.5 SFZ 1.1 173. 5.06 21.3

1lfi2YK 1C 08 56 53.0 IFT 25.0 1344.

«fi2lK IB 09 OC 23.0 IFZ 19.0 8322. 6.37 21.3

FK-CF EF 08 51 26.7 SFZ 0.8 241. 5.38 23.4

FK«CN 1C 08 59 42.0 IFT 21.0 3128.

5!C-Cli IB 09 01 27.0 IFZ 18.0 2422. 5.87 23.4

Alt» LB 09 01 38.0 IFZ 23.0 89. 4.52 28.2

CEC EF 08 52 36.3 SFZ 0-7 148. 5.C2 30.5

CfC LC 09 03 24.0 IFT 23.0 26 76.

CEC IB 09 05 03.0 IFZ 21.0 857, 5.54 30.5

FF-i? EF 08 53 07.6 SFZ 0.7 16. 4.60 34.1

RH-HI EF 08 54 01.1 SFZ 0.9 154. 5.33 40.4

RM-HI 1C 09 08 29.0 IFT 22. G 382.

RN-RZ Z 09 10 43.0 IFE 17.0 1762.

HAC ZP 08 5T 48.0 AB 1.2 128. 5.71 72.4

RAC IB 09 28 03.0 IFZ 23.0 282. 5.43 72.4

CFIGI« IAT. 1CNG. DEFTH (KH) HAG SD? STA IP.IAG LPSDV LPSTA

06: 46:35. 2 41 .108N 123 .566« 82. CAIC 5.18 0 .36 6 5.52 0.6 (i

Ofi« 46:21. 8 40 .57 4M 124 .C19H 0. BEST 5.27 0 .39 6 £.53 0.6 6

IAC SOT OSEC IN CAIC BOB SF AVG. RAG. IAC NOT OSEE IN FEST BON SF AVG. RAG. Short-period magnitudes (mb) used in averaging are restricted to those recorded at distances between 20 and 110 degrees from the epicenter.

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