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The island of San Miguel is currently dormant, some steam and warmth from various volcanic springs. The island is on the African plate, separated from Pico by the mid-Atlantic Oceanic Ridge

Some details

Magma Evolution of the Sete Cidades Volcano, São Miguel, Azores

CHRISTOPH BEIER, KARSTEN M. HAASE, THOR H. HANSTEEN Journal of Petrology, Volume 47, Issue 7, July 2006, Pages 1375–1411.