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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.

References

1. Ramos, Victor A.; Cristallini, E.O.; Pérez, Daniel J. (2002). "The Pampean flat-slab of the Central Andes". Journal of South American Earth Sciences. 15 (1): 59–78. Bibcode:2002JSAES..15...59R. doi:10.1016/S0895-9811(02)00006-8. hdl:11336/93813.
2. Stern, Charles R (December 2004). "Active Andean volcanism: its geologic and tectonic setting". Revista Geológica de Chile. 31 (2): 161–206. doi:10.4067/S0716-02082004000200001. ISSN 0716-0208. Retrieved 2008-11-20.

• von Huene, R.; Corvalán, J.; Flueh, E. R.; Hinz, K.; Korstgard, J.; Ranero, C. R.; Weinrebe, W. (1997), "Tectonic control of the subducting Juan Fernández Ridge on the Andean margin near Valparaiso, Chile", Tectonics, 16 (3): 474–488, Bibcode:1997Tecto..16..474V, doi:10.1029/96TC03703, S2CID 129668321

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