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Volcanoes of Samoa | John Seach
Samoa is located on a subduction zone at the junction of the Australian and Pacific tectonic plates.
Further reading
McDOUGALL, I.A.N., 2010. Age of volcanism and its migration in the Samoa Islands. Geological Magazine, 147(5), pp.705-717.
Koppers, Anthony AP, et al. "Samoa reinstated as a primary hotspot trail." Geology 36.6 (2008): 435-438.