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Billy Mitchell (volcano)
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Billy Mitchell (volcano) : ウィキペディア英語版
Billy Mitchell (volcano)

Billy Mitchell is a volcano in the central part of the island of Bougainville, just northeast of the Bagana Volcano in Papua New Guinea. It is a small pyroclastic shield truncated by a 2 km wide caldera filled by a crater lake.〔(The Billy Mitchell ) at the Global Volcanism Program website〕
The last two major eruptions were in 1580 AD ± 20 years and about 1030 AD. They were among the largest Holocene eruptions in Papua New Guinea. Both were explosive eruptions with a Volcanic Explosivity Index of at least 5. The 1580 AD ± 20 years eruption produced pyroclastic flows and probably formed its caldera.〔(The Billy Mitchell erupts ) at the Global Volcanism Program website〕 The ignimbrite deposit from that eruption, which had a VEI of 6, extends from the caldera to the coast, and its volume is around .〔
==See also==

* List of volcanoes in Papua New Guinea
* Mount Billy Mitchell (Chugach Mountains)
* Timetable of major worldwide volcanic eruptions

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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