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Difficulties of PSHA in Colombia because of data scarcity


, : Difficulties of PSHA in Colombia because of data scarcity. Bulletin of the International Institute of Seismology and Earthquake Engineering 46: 144-151

This paper presents a PSHA for Colombia, using data since 1960 until 2010, covering an area from 80 degrees W to 70 degrees W longitude and 1 degrees S to 15 degrees N latitude. Recurrence laws and seismic hazard curves were calculated for 2 degrees by 2 degrees areas. There are areas without enough data to obtain a slightly acceptable. recurrence law. After that, hazard curves were calculated using Fukushima and Tanaka (1990) attenuation relationship. Finally a peak ground acceleration map was developed for Colombia. There are zones that, from a probabilistic point of view, it is not possible to assign any value. Assessments have been done mean an algorithm developed by author. Peak ground accelerations, for 475 years return period, range from 438 gals on Pacific Colombian coast in places such Uraba swarm and Colombia-Ecuador borderline, to 270 gals on Magdalena Medio Zone. There is not an agreement to assign a seismic hazard level in prone earthquake zones, with well know catastrophic events, but in a scarcity of historical and instrumental data. Recent Haiti earthquake (2010) is an example of zones with significant shaking background but not enough seismological data.

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