Hakkoda Group
"The basaltic-to-rhyolitic Hakkoda volcano includes 14 stratovolcanoes and lava domes south of Mutsu Bay at the northern end of Honshu. The NE rim of an 8-km-wide Pleistocene caldera forms an arcuate ridge across a flat caldera-floor moat NE of the Hakkoda group volcanoes, which bury the SE caldera wall. A northern group of volcanoes, constructed within the caldera, appears to be younger than the southern group. Hakkoda-Odake, Ido-dake, and Tsurugi-dake have well-preserved craters. Akakura-dake has a 1-km-wide explosion crater breached to the north. No historical eruptions are known of the Hakkoda group, although an active solfatara occurs at Ido-dake, and hot springs are found at several locations within the caldera. Three minor phreatic eruptions were documented from Jigoku-numa on the SW flank of Odake volcano from the 13th-17th centuries. Three soldiers on a training mission in July 1997 were killed by inhalation of volcanic gas."  -Smithsonian Volcano Archive
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