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;C^C4 SPECIAL PATA COLLECTION ^YSTEIV^|VENT BEPORX

NTS Event N COLBY', 14 March 1976.

(/U/ KJJ/HIII, MjS./Dawkins^lli MjD./jillispie

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Teledyne Geotech, 314 Montgomery Street, Alexandria, Virginia 22314

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APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED

Sponsored By

The Defense Advanced Research Projects Agency

Nuclear Monitoring Research Office

1400 Wilson Boulevard, Arlington , Virginia 22209

rrA* * 1 T: I^RPA Order IW^897 Ji^]

Monitored By

VELA Seismological Center

312 Montgomery Street, Alexandria, Virginia ^2314

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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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^nrlaRfiiftgd SECURITY CLASSIFICATION OF THIS PAGE (Whmn D«t« EnCf.dJ

REPORT DOCUMENTATION PAGE I. REPORT NUMBER

SDCS-ER-76-90 y

2. GOVT ACCESSION NO

«. TITLE fand Subtlllm)

SPECIAL DATA COLLECTION SYSTEM (SDCS)

NTS Event "COLBY", 14 March 1976

READ INSTRUCTIONS BEFORE COMPLETING FORM

3. RECIPIENT-S CATALOG NUMBER

5 TYPE OF REPORT ft PERIOD COVERED

Technical

7. AUTHORf»;

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

9. PERFORMING ORGANIZATION NAME AND ADDRESS

Teledyne Geotech 314 Montgomery Street Alexandria, Virginia 22314

S. PERFORMING ORG. REPORT NUMBER

8. CONTRACT OR GRANT NUMBERC«;

F08606-74-C-0013

10. PROGRAM ELEMENT. PROJECT, TASK AREA ft WORK UNIT NUMBERS

tl. CONTROLLING OFFICE NAME AND ADDRESS

Defense Advanced Research Projects Agency Nuclear Monitoring Research Office 1400 Wilson Blvd.-Arlington, Virginia 22209 "i i i m ■

T/4703

12 REPORT DATE

May 28, 1976 r

U. MONITORING AGENCY NAME I ADDRESSr» dill»,«,! Irom CoMrcllln, Olllc)

VELA Seismological Center 312 Montgomery Street Alexandria, Virginia 22314

13 NUMBER OF PAGES

13 IS. SECURITY CLASS. Co/ Ci/i '»pof-l

Unclassified

IS* DEC LASSIFlC ATI ON DOWN GRADING SCHEDULE

1«. DISTRIBUTION STATEMENT (ol Ihli R»po,l)

APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED.

17. DISTRIB UT.ON STATEMENT (ol ,*, .».Ir.c, .nl.r.d In flloci. 30. Tl

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SDCS EVENT REPORT NO. 9 0

Event "COLBY", 14 March 1976

(M /;vlL. ami/orIPECIAL-

shis e\ nt report contains seismic data from the SpeoialVData Collection System (SDCS), and other sources for the «feev« event. Published epicenter information from seismic observations is:

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

NORSAR 12:41:32.0 12:30:06 38 N 116 W 5.9 N/A Hagfors 12:41:40.2 12:29:58 37 N 118 w 6.5 5.3

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

12:30:01.2 37.3N 116.5W 6.2 6.0

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 these 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 CPSO, WH2YK, FN-WV, HN-ME, LASA and NORSAR. RK-ON short-period data could not be retrieved from the field station analog tape. All SP channels at HN-ME had polarity reversals; to correct this, mathematical inversions of the data were performed. Horizontal SP channels at CPSO, WH2YK, FN-WV and HN-ME were rotated.

Long-period signals were recorded at CPSO, WH2YK, FN-WV and HN-ME. RK-ON long-period data could not be retrieved from the field station analog tape. The LP vertical instrument at WH2YK was not responding properly. All LP channels at HN-ME had polarity reversals; to correct this, mathematical inversions of the data were performed. Horizontal LP channels at CPSO, WH2YK, FN-WV and HN-ME were rotated.

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

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HYPOCENTER DETERMINATION

INPUT FOR EVB.JT 14 HAR 76 12:30:00.0 37.000N 116.000W OKM,

RESIDUALS DIST. AZ. STA. ARRIVAL CALC REST REST REST LAO 12 32 54.C -0.0 0.1 12.1 35.8 CPSO 12 35 25.0 -0.2 O.U 24,9 84.5 HH2YK 12 35 37.0 0.1 0.5 26.2 339.3 FN-WV 12 36 02.9 0,2 0.3 29.1 76.1 HN-ME 12 37 09.2 0.1 -0.5 36.8 60.U NAO 12 Hl 32.0 -0.2 -0.9 73.2 2U.0

67 HERRIN TRAVEL TIME TABLES

ORIGIN LAT. LONG. DEPTH (KM) 12:30:11.7 37.667N 116.205W 6U. CALC 12:30:01.2 37.286N 116.U93W 0. REST

SDV IT STA 0.2 3 6 0.6 3 6

CALC 1 . 1

0 . 0 0 0. 2 2

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0 . 0

REST 1 . 1

0 . 0 0 0. 2 2

0 0. 0 0 0 . 0

0 . 0

CHI2 COVERAGE ELLIPSE; 95 PER CENT CONF..LEVEL, SDV= 1.69 MAJOR 67.1KM. MINOR 38.OKM. AZ= 31 AREA= 8007 SQ.KM. FEST

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DATA SUMMARY

INPÖT FOR EVENT 12:30:00.0 37.000N

ARRIVAL STÄ. PHASE TIME

■U MAR 76 116.000W OKM.

INS T PER hZl. MAGNITUDE MB MS DIR DIST

LAO CPSO CPSO CPSO WH2YK «H2YK FN-HV FN-WV FN-HV HN-HE HN-HE HN-ME NÄO

EP EP

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12 12 12 12 12 12 12 12 12 12 12 12 12

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SAB SPZ LPT LPZ SPZ LPT SPZ LPT LPZ SPZ LPT LPZ AB

59.9 0.9

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23.0 1.3

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27.0 17.0 0.9

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9759. 556. a58.

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6.71

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6.38

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ORIGIN LAT. LONG. 12:30:11.7 37.667N 116.205W 12:30:01.2 37.286N 116.a93W

DEPTH (KM) 6a. CALC

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HAG SDV STA LPMAG LPSDV LPSTA 6.09 o.ag a 6.05 0.2 2 6.17 0.a5 a 6.05 0.2 2

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