The U.S. Commonwealth of Puerto Rico has a population of 3.8 million (2000 Census), a higher population density than any U.S. state. The island, approximately 160 km east to west by 50 km north to south, is bounded by offshore active faults on all sides. Numerous local and regional events in the recorded history with M > 7.0, some of which have generated tsunamis, have caused extensive damage to local infrastructure, though the last significant ground motions were felt onshore in 1918. The U.S. Geological Survey hazard maps (Mueller et al. 2003) indicate that the seismic hazard is...

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