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Akan volcano, in eastern Hokkaido in the southern Kurile arc, occupies a rectangular caldera (24 × 13 km) with a long (1.7–0.2 Ma) and complex history. This paper combines tephrostratigraphy, tephrochronology, and petrological and geochemical evidence to elucidate the eruptive history and evolution of the caldera. Pyroclastic deposits from Akan caldera are divided into at least 40 “eruptive units”,...
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