Japan's giant caldera volcano refilling after 7,300 years: Study

Japan's Kikai Caldera volcano is refilling with magma, researchers at Kobe University have found. The volcano last erupted 7,300 years ago in one of the most powerful eruptions of the Holocene. The study confirmed a substantial magma-rich region beneath the giant caldera. A caldera is a depression formed when a volcano collapses inward following a violent eruption.