Probabilistic Seismic Hazard Assessment Study for the Eastern Caribbean Region

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The aim of this paper is to illustrate the results of a probabilistic seismic hazard study that has been carried out in the Eastern Caribbean Region (9-19°N, 58-65°W). The analysis was implemented using a standard logic tree approach which allowed taking into account systematically the model-based (i.e. epistemic) uncertainty. Hazard computations were performed for a grid with a space resolution of 0.025 degrees, with an average spacing of the nodes of about 2.8 km, using the standard Cornell-McGuire approach based on the definition of appropriate seismogenic zones. A comprehensive earthquake catalogue was updated for the region from a merger of available databases. A thorough investigation was undertaken to identify the most suitable ground motion prediction equations to be used. Uniform hazard spectra were calculated for horizontal component (stiff soil site and level ground condition), 4 return periods (95, 475, 975, 2475 years) and 22 structural periods (from 0 to 3 sec.).
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Earthquakes, Eastern Caribbean islands, Seismic hazard, Subduction zone