Contribucion de la paleosismologia a la sismicidad historica: Los terremotos de 1610 y 1894 en Los Andes venezolanos meridionales
- Autores: Franck A. Audemard
- Localización: Revista geográfica venezolana, ISSN-e 2244-8853, ISSN 1012-1617, Vol. 39, Nº 1-2, 1998, págs. 87-105
- Idioma: español
- Títulos paralelos:
- Contribucions of paleoseimology to historical seismicity: The 1610 and 1894 earthquakes in the southern Venezuelan Andes
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Resumen
Contemporary instrumentally-recorded seismicity has proved to be insufficient in many areas of the world to assess the seismic hazard of a given fault or area because of the low frequency of great earthquakes. Historical seismicity -the study of documented historical aerquakes-has also met some difficulties when evaluating the destructive aerthquakes recurrence in countries of short written history (few centuries), characterized by complex active tectonic settings where large earthquakes have long return period. Consequently, paleoseismology has tried to fill this information void by studying the geological record of disturbed recent markers by past earthquake surface ruptures. With time, this traditional goal has broadened very much, since this discipline has also brought new light to both historically-and instrumentally-recorded aerthquakes. The assessment of two historical -La Grita 1610 and Santa Cruz de Mora 1894- earthquakes of the Venezuelan southern Andes by paleoseismic trenching is discussed in this paper. Its main conclusions are that: these two earthquakes can now be certainly attributed to the Bocono fault, their magnitude has been estimated at Ms. 7,1 to 7,3 and their return period is close to 300 years.
