Puerto Rico tsunami deposit could have come from pre-Columbian megathrust earthquake

Описание: Puerto Rico tsunami deposit could have come from pre-Columbian megathrust earthquake

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These Puerto Rican tsunami deposits, along with similar age deposits at other islands in the Caribbean, suggest that the tsunami would have been triggered by a massive magnitude 8.7 or larger earthquake, said Bruce Jaffe of the U.S. Geological Survey. The deposits could be very important for understanding seismic risk in the region, since written records of tsunamis in the Caribbean extend back only 500 years, and the evidence for magnitude 8.0 or larger earthquakes on the Puerto Rico Trench is sparse. Previous research has uncovered Caribbean tsunami deposits along the northern segment of the Lesser Antilles arc in Anegada,...