"The 20 x 26 km Kutcharo caldera (also spelled Kussharo or Kuccharo), is the largest of a cluster of calderas in NE Hokkaido. The caldera was formed in a series of major eruptions between about 340,000 and 30,000 years ago. Naka-jima, a Holocene post-caldera dacitic-to-rhyolitic lava-dome complex, forms an island in the large lake that fills much of the western half of the caldera. The Holocene Atosanupuri stratovolcano and lava-dome complex islocated near the center of the caldera, east of the crescent-shaped Lake Kutcharo. Many lava domes were formed at Atosanupuri between about 10,000 and 1000 years ago. No historical eruptions are known, although intense fumarolic activity occurs on and around Atosanupuri volcano and along the shores of Lake Kutcharo."  -Smithsonian Volcano Archive
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