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1 AD-A0:8 104 SPECIAL DATA COLLECTION SYSTEM EVENT REPORT - WESTERN KAZAKH, 25 APRIL 1975 J. R. Woolson, et al Teledyne Geotech Prepared for: Advanced Research Projects Agency Air Force Technical Applications Center 8 September 1975 mi DISTRIBUTED BY: National Technical Information Service U. S. DEPARTMENT OF COMMERCE

2 ]' SDCS ER 75 5 * 1 o 00 SPECIAL DATA COLLECTION SYSTEM EVENT REPORT Western Kazakh, 25 Aprii 1975 J.R.Woolson, 0.0 Solari. 0 J Rrinbold. and R.J Markle Alexandria Laboratories Teledyne Geotech. 314 Montgomery Street, Alexandria. Virginia September 1975 APPROVEO FOR PUBLIC RELEASE, DISTRIBUTION UNLIMITEO Sponsored By The Defense Advanced Research Protects Agency Nuclear Monitoring R'iearch Office 1400 Wilson Bouleva'd. Arlington, Virginia ARPA Order No?897 D. Monitored By,entei VELA Ser^ological Ci 312 Montgomery Street. Alexandria. Virginia OEC ^Eu:. NATIONAL TECHNICAL INFORMATION JFRVICE US D»p..rtm«n' f Commvrr* Sprtngfiald. VA. 22)51

3 ]} r rla>iblfted»tclmity CLASSIfICATION 0' THIS ^»OE (*» Dmim Enftmt 1 «tpof T NUMBER SDCS-ER-75-5 «. TITLE (m>d Sulxltl.) REPORT DOCUMENTATION PAGE SPECIAL DATA COLLECTION SYSTEM (SDCS) Wostern Rasakh, 25 April AUTHORf«; 2. OOVT «CCE»»IOM NO Woolson, J. R., So.'arl, D. D., Relnbold, D. J., and Markle, R. J.» PERFORMING OR0AN1/AT1ON NAInE AND ADDRESS Alexandria Laboratories 314 Montgomery Street Alexandria. Virginia II. CONTROLLING OFFICE NAME AND ADDRESS Defense Advanced Research Projects Agency Nuclear Monitoring Research Office 1400 Wilson Blvd.-Arlington, Virginia It MONITORING AGENCY NAME ADORESSOf ««Mol from ConrrolKn fin«olllct) VELA Seistaological Center 312 Montgomery Street Alexandria, Virginia I S READ INSTRUCTIONS BEFORE COMPLETINi'. FORM HEClPlENT'S CATALOG NO-JBt«TYPE OF REPORT * PERIOD COVERED Technical PERFORMING ORG. REPORT NUMBER. CONTRACT OR GRANT NUMBERfaJ F C-Ü PROGRAM ELEMENT PROJECT, TASK AREA WORK UNIT NUMBERS T/47G3 12. REPORT DATE 8 September 1975 II. NUMBER OF PAGES SECURITY CLASS (ol thlt ttpotl) Tii unclassified OECLASSlFiCAIION DOWNGRADING SCHEDULE It DISTRIBUTION STATEMENT (el Ihlt Rtporlt APPROVED FOR PUBLIC RELEASE; DISTRIBUTICN UNLIMITED. 17 DISTRIBUTION STATEMENT (ol Ml. tbtlfcl.nl.r.d In Block 20. II dlllmttnl Inm B.parl) U SUPPLEMENTARY NOTES I» KEY WO^DS (Coniinut on «.«. ild» llnmcfty -td Ido-M'ly»r W«elt nu«n6.r; ABSTRACT (Contlnuo on rovft lido II ntcfty and Idonllly by 6lor» numbor) DO, JAN M EDIT^N OF 1NOV»SIS OBSOLETE ' / Unclassified SECURITY CLASSir,CATION OF THIS PAGE FBCS P-» Fn f*,l.

4 SDCS Event Report No. 5 Western Kazakh, 25 April 1975 This event report contains seismic date from the Special Data Collection System (SDCS), and other sourcas for the above event. Published epicenter information from seismic observations is; rigin Time Latitude Longitude "b M s NORSAR* LASA 05:00: ON 47.0E 4.7 N/A 04:59: N 44.9E 4.6 For one SDCS station combined with the arrays the average magnitude becomes RKON, LASA & NORSAR N/A N/A N/A 4.4 *The listed epicenter is that published in the weekly NORSAR Bulletin. The included NORSAR plot is the same event prior to rework. A somewhat different epicenter is listed on the plot. The plot corresponding to the published epicenter was not recoverable. 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 ^actors are not reported for NORSAR short-period. All SDCS stations were operational for this event; however, only RK-ON recorded a short-period signal. All long-period systems were negative. A possible signal appears on CPSO SP, but instrumentation spiking precludes arrival time or amplitude determination. The time window presented by the CPSO SP data presentation is offset from the predicted arrival time for this event Hue to extreme tape system spiking immediately before and after the data set. Long-period data from NORSAR, LASA, and ALPS were unrecoverable. -/-

5 DATA SUMMARY Sta. Phase Arrival Time NAO EP 05:05:22.4 AB RK-ON EP 05:11:51.3 SPZ LAO EP 05:12:28.8 AB Inst Per A/T Est. m. D i s t O.y Average m. = 4,42 (3 Stations) - -

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7 HN-ME 25 RPR mm TNt 1 I * rn^mß^»* 101 >^* L lottc -^

8 NH2YK 25 RPR 75 SPZ 72 m\i SPR 7.2 mp SPT 9.8 mp TIME rav*>, vwys^<'vv**^wv<i 10»ec I TIME QUESTIONABLE -.s -

9 RK-ON 25 RPR SPZ 9.6 mm SPR 8A mp SPT 7.4 mp TIMfL CÄ 10 sec -^-

10 FN-WV 25 RPR 75 TIME 10 sec -7-

11 CPSO 25 RPR am SPE I9 m i TIME 10'«c - -?-

12 .«iiiüiauiiiiniii ' """" :"i Kl -<?-

13 in k >- -/<;-

14 I MIM in i ^ i- "//-

15 in -/p.-

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