Juan Fernández Ridge

33°40′41″S 79°46′49″W / 33.67806°S 79.78028°W / -33.67806; -79.78028The Juan Fernández Ridge is a volcanic island and seamount chain on the Nazca plate.

It runs in a west–east direction from the Juan Fernández hotspot to the Peru–Chile Trench at a latitude of 33° S near Valparaíso.

The Juan Fernández Islands are the only seamounts that reach the surface.

Subduction of the ridge beneath South America is thought to have caused the Pampean flat-slab and its associated inland tectonic deformation and reduced magmatic activity.

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Map of the volcanic arcs in the Andes and subducted structures affecting volcanism