Much of South American

Much of South American seismic activity and volcanism originates from subduction of the oceanic Nazca Plate under the continental South American Plate and subduction of the Pacific's lithosphere under the South American continent. This seismicity extends for 6,000 km (4,000 mi) along the continent's western edge, and probably stems from a region of northeast-trending faulting near the Ecuadorian Trench. The region of faulting may actually function as its own microplate.[2]
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