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Kikai
"Kikai is a mostly submerged, 19-km-wide caldera near the northern end of the Ryukyu Islands south of Kyushu. Kikai was the source of one of the world's largest Holocene eruptions about 6300 years ago. Rhyolitic pyroclastic flows traveled across the sea for a total distance of 100 km to southern Kyushu, and ashfall reached the northernmost Japanese island of Hokkaido. The eruption devastated southern and central Kyushu, which remained uninhabited for several centuries. Post-caldera eruptions formed Iwo-dake lava dome and Inamura-dake scoria cone, as well as submarine lava domes. Historical eruptions have occurred in the 20th century at or near Tokara-Iwo-Jima (also known as Satsuma-Iwo-jima), a small 3 x 6 km island forming part of the NW caldera rim. Showa-Iwo-jima lava dome (also known as Iwo-jima-Shinto), a small island 2 km east of Tokara-Iwo-jima, was formed during submarine eruptions in 1934 and 1935. Mild-to-moderate explosive eruptions have occurred during the past few decades from Iwo-dake, a rhyolitic lava dome at the eastern end of Tokara-Iwo-jima."  -Smithsonian Volcano Archive
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