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Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

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466 G. E. Fiedler B.Table 1. Earthquakes with M 2 7 Recorded at Cagigal (OCV)Date Origin Arrival Epicenter M Approximateyear/mo/da time timeLat. Long. (PAS) epicentralhr:mn:sec hr:mn:sec region1934/07/181935/12/1419371121231938/02/051939/12/211941/12/051942/05/141942/08/061942/08/241943/05/021943/07/291944 106 / 2 81946/05/211946/08/041946/08/081946/10/041948/04/211950/10/051950/10/231953/03/191953/12/1201:36:24.022:05:17.013:17:56.002:23:24.020:54:48.020:46:58.002: 13: 18.023:36:59.022:50:27.017:18:09.003:02:16.007:58:54.009:16:42.017:51:05.013:28:28.014:45:26.020:22:02.016:09:31.016:13:20.008:27:53.017:31:25.001:49:06.022:32 :04 .O13:29:26.002:26:06.02 1:18:07.020:48:48 .O02:18:10.023:37:00 .O22:57:19.017:19:24.003:06:00 .O08:12 :48 .O09: 18 :48 .O17:53:19.013:30:41.014:48:18.020:24:12.016: 14:07.016:23:25.008:26:45.017:36:27.008.00 N 082.50 W14.75 N 092.50 W16.75 N 098.50 W04.50 N 076.25 W10.00 N 085.00 W08.50 N 083.00 W00.75 S 081.50 W14.00 N 091.00 W15.00 S 076.00 W06.50 N 080.00 W19.25 N 067.50 W15.00 N 092.50 W14.50 N 060.50 W19.25 N 069.00 W19.50 N 069.50 W18.75 N 068.50 W19.25 N 069.25 W11.00 N 085.00 W14.50 N 091.50 W14.10 N 061.21 W03.40 S 080.60 W7.77.37.57 .O7.37.58.38.38.67.17.97 .O7 .O8.17.97 .O7.37.77.17.37.7PanamaMexicoMexicoColombiaCosta RicaPanama-Costa RicaEcuadorGuatemalaPeruMalpelo-Isl.N. Puerto RicoGuatemala-MexicoE Martinique Isl.Dominican Rep.Dominican Rep.Mona- PassageDominican Rep.Costa Rica-NicaraguaGuatemalaS t a. Lucia-Martin iqueEcuador4. ConclusionThe smoked-paper seismograms <strong>from</strong> <strong>the</strong> first, or historical, Cagigal Observatoryin Caracas were recorded on a two-component horizontal Wiechert seismograph.These records may contribute significantly to <strong>the</strong> relocation of several importantand large earthquakes that occurred <strong>from</strong> 1934 to 1953. A careful reevaluation of<strong>the</strong> dynamic response curve of <strong>the</strong> seismograph and <strong>the</strong> records must be made topermit this information to be used with later data <strong>from</strong> CAR and o<strong>the</strong>r internationalseismological observatories, to improve knowledge on earthquake activity andtectonics.AKNOWLEDGEMENTSThe author of this paper likes to thank Dr. W. H. K. Lee and his staff for <strong>the</strong>irtechnical help.REFERENCESCenteno Grau, M. (1940). Estudios Sismologicos, Litografia Comercio, Caracas.U.S. National Geophysical Data Center (1972). Earthquake Data File 'Summary, Key toGeophysical Records Documentation No. 5, Boulder, CO., USA.Venezuela, Cagigal Observatory (1953). Notes of recorded earthquakes at <strong>the</strong> CagigalObservatory, 1933-1953, handwritten manuscript, not published, Caracas.

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