Peru–Chile Trench

[1] The trench is also a part of the Chile triple junction, an unusual junction that consists of a mid-oceanic ridge and the Chile Rise being subducted under the South American plate at the Peru–Chile Trench.

From the Chile triple junction to Juan Fernández Ridge the trench is filled with 2.0–2.5 kilometres (1.2–1.6 mi) of sediments, creating a flat bottom topography.

Sediments are mainly turbidites interspersed with oceanic deposits of clay, volcanic ash, and siliceous ooze.

[1] The Peru–Chile Trench, the forearc and the western edge of the central Andean plateau (Altiplano), delineate the dramatic "Bolivian Orocline" that defines the Andean slope of southern Peru, northern Chile, and Bolivia.

[2] At times, El Niño disrupts the usual wind pattern and lessens the upwelling.

Peru–Chile Trench
Significant Earthquake Faults and damaging earthquakes over the past century along the South American Subduction Zone [ 6 ]
South America showing 100-year earthquake shaking projections. [ 6 ]