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SOCS ER 75 27

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SPECIAL DATA COLLECTION SYSTEM EVENT REPORT

Tadzhik SSR. 09 April 1975

J.R Woolson, DD Solan, WS Dawk.ns, K J Hill, and R J Markle

Alexandria Laboratoiies -^

/ T-ledyne Geotech, 314 Montgomery Street. Alexandria, Virginia 22314

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October 197S

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 2897

Monitored By

VELA Seismological Center

312 Montgomery Street. Alexandria. Virginia 22314

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Disclaimer: Neither the Defense Advanced Research Projects Agency nor the Air Force Technical Applications Center will be responsible for 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.

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REPORT DOCUMENTATION PAGE ' KL .JH ' NUMBtN

SDCS-ER-75-27

i GOVT ACCESSION NO

- 4 TlTuf i»ni( SubUdp;

SPECIAL DATA COLLECTION SYSTEM (SDCS) I /.- ^T

Tadzhlk SSR, 9 April 1975.

I AUTMORr»;

Woolson, J. R. , Solarl, 0. D., Dawklns, M. S., Hill, K. J., and Markle, R. J.

READ INSTRUCTIONS BEFORE COMPLETING KORM

3 RECIPIENT'S CATALOG NUMBER

5. TYPE OF REPORT « PERIOD COVERED

^J Technical ■'<;.

« PERFORMING ORG. REPORT NUMBER

B CONTRACT OR GRANT NUMBERr«J

F08606-74-C-O013,

9 PfcBFORMING ORGANIZATION NAME AND AODRESS

Teledyne Geotech . 314 Montgomery Street y I /if' ; Alexandrlo, Virginia 22314

II CONTROLLING OFFICE NAME AND AODRESS

Defense AIvanced Research Projects Agency Nuclear M nitoring Research Office 1400 WM' on Blvd.-Arlington, Virginia 22209

(TA 14 MONITORING AGENCY NAME h AODRESSC/f illtermnl Irom Controlling Ollica)

VELA Seismological Center 312 Montgomery Street Alexandria, Virginia 22314

3 Wr.

lA » WORK UNITVlUMBERS

T/4703

12 REPORT DATE 21 OctotJ»rs»75

13 NUMä"" jF PAGES

12 15 SECURITY CLASS, (ol Ihlt fporl)

Unclassified

15» DECL ASSIFIC ATION DOWNGRADING 3CHEOULE

16 DISTRIBUTION STATEMENT (ol Ihlt Rtporl)

APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED.

17 DISTRIBUTION ST AT EUENT (ol lh» mbulrmcl tnltfd In Block 30, II dllltrtnl Irom Rtparl)

jOj J. P. A^oolson, D. 0. /Solari, M. S. /OawUns -i K. J. /Hill R. J. /Markle

. ■■

— 18 SUPPLEMENTARY NOTES

19 KEY WORDS (Conllnu» on revert» tide II necettmry and Idenllly by block number)

Ö 20 ABSTRACT rt onllnu» on reverse aide II necetemry »nd Idenllly b block number)

DD 1 JANM73 1473 EDITION OF I NOV 65 IS OBSOLETE Unclassified SECURITY CLASSIFICATION OF THlS PAGE (»hen Hmle Fnlere,l<

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SDCS Event Report No

.'ADZHIK SSR, 9 April 19 75

This event report contains seismic dataxfrom tjie Special Data Collection System (SDCS), and other sources for the" abo^e^event. Published epicenter information from seismic observations is:

\

Origin Time Latitude Longitude \

M s

NORSAR 22:25:36 37.5N 073.2E 5.4 N/A LASA 22:25:34 38.ON 074.OE 5.5 N/A PDE 22:25:28 38. IN 072.7E 5.5 N/A Hagfors An ray, Sw( iden 22:26:00 41 N 068 E 5.7 4.2

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

become 22:25:28 39.9N 073.5E 4.8 N/A

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FN-WV was not operational for this event.

Short-period signals associated with this event were recorded at WH2YK, RK-ON, LASA and NORSAR.

Analysis of long-period data produced associated signals only at NORSAR.

Details of the program used to obtain beamed vertical, radial and transverse long-period data at LASA, ALFA and NORSAR are in the process of being reviewed. Vertical bear.s are probably valid while horizontal beams are questionable.

Scaling factors on plots are millimicrons at I H? (r.ot 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 fcr NORSAR short-period.

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INPUT FC: EVENT 22:2S:35.0 37.500N

HYPOCENTER DETERMINATION

9 APP ■7C

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PESIDÜALS PTST. AZ. STR. APFIVAL CA1C PFS'', PFST PFST NAO 22 33 29.3 -0.0 0.1 tt3.1 320. e

WH2YK 22 37 22.2 -0.0 -C.l 77.1 13.9 PK-OV 22 38 22.8 -0.0 -r,i «9.0 351.q IAO 22 38 Ü7.C .r..n 0.7 «3.8 3^9.8

67 REFFTN TRAVEL TM! TAPIFS

ORIGIN LAT. LONG. DEPTH (K!1) 22:27:18.2 tt7.363N 7m62E 727. CAIC 22:25:28.1 3Q.866N 73,^105 0. PFS^

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0 0. 0 0 0 . 0

0 . 0

CHI2 COVERAGE ELLIPSE; 95 PER CENT CCNF..LEVEL, SDV= 0.93 BAJOP 265.6KH. HINOR 51.1KI!. AZ= 11 ÄREÄ= 42621 SQ.KM. PEST

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DATA SUMMARY

22:25 INPHT

35.0 FOB EVENT

37.500N 9 APR

73.500E 75

OKU.

APBIVAL MAGNITODE STAj. 2HASE TI«! IHS2 Ell t/Ll Bl AS.

NAC NAC NAC WH2YK EK-ON LAC

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EP EP EP

CEIGIN 22:27:18.2 22:25:28.1

22 33 29.3 22 19 30.0 22 52 20.0 22 37 22.2 22 38 22.d 22 38 «47.0

AE LAB LAP 5PZ SP2 AE

LAT. «I7.363N 39.e66N

0.7 20.0 16.0 0.9 0.8 1.0

1CNG. 71.a62E 73.5ieE

89. 7.

21. 10. 7.

15.

DEPTH (KM) 727, CALC

0. BEST

5.1

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a.08

MAG U.39 Ü.82

SCV 0.a5 0.30

STA H a

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13.1

U3.1 77.1 89.0 93.8

Average long-period magnitude (Ms) is based on Rayleigh wave observations in the period range of 17 to 23 seconds per cycle.

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NORSRR EVENT FILE 1975 RPR 9 EPX NO. 26980 flPP. 22.33.29.2 37.5N 73.2E 5.MMB 33KM

DIST - MM.8 RZI • 91.9 OMP - bl.O PER - 1.0 UMETH 2

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