The Peru earthquake of September 25, 2013, occurred as thrust-faulting on or near the thrust-interface at the boundary between the South America plate and the subducting Nazca plate. The Nazca plate subducts beneath the South America plate at the Peru-Chile trench offshore of western South America, and the thrust interface between the two plates dips east-northeast beneath the South American continent.
At the latitude of the earthquake, the Nazca plate moves to the east-northeast with respect to the South America plate at the velocity of about 70 mm/y. The boundary-region between the Nazca plate and South American plate experiences a large number of earthquakes.
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