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Earthquake Hazards Program

Tectonic Summary

Magnitude 7.2 NEAR THE WEST COAST OF COLOMBIA
Monday, November 15, 2004 at 09:06:56 UTC

Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver

The earthquake occurred near the boundary of the Nazca and South American plates. In this region, the Nazca plate is moving easterly with respect to the South American plate with a velocity of about 60 mm/year and subducting beneath it. The location and focal mechanism of the earthquake are consistent with the shock's occurring on the thrust interface between the plates. The Mw = 7.2 earthquake of November 11, 1991 had a very similar location and focal-mechanism; the 1991 shock killed two people.

 


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