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Ibusuki Volc Field
"Ibusuki volcanic field at the southern tip of Kyushu consists of numerous central cones and maars, the 4.5-km-wide Ikeda-ko caldera, and Kaimon-dake stratovolcano. The symmetrical, 922-m-high andesitic Kaimon-dake is the most prominent feature of the volcanic field and is capped by a lava dome. The large Pleistocene Ata caldera, once thought to partially underlie the Ibusuki volcanic field, is now considered to be located farther to the east beneath Kagoshima Bay. Ibusuki Volcanic Field has been very active during the Holocene, forming the Ikeda-ko caldera about 4600 years ago, numerous maars and lava domes, and, during the last 4000 years, Kaimon-dake. After about 2650 years ago, all eruptive activity has been restricted to Kaimon-dake. Its last eruption took place in the 9th century."  -Smithsonian Volcano Archive
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