Poster of the Colombia Earthquake of 15 November 2004 - Magnitude 7.2
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 70 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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