地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
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大規模カルデラ形成噴火と活動的後カルデラ火山
─北海道南西部,洞爺カルデラと有珠火山の地質概説および露頭紹介─
長谷川 健松本 亜希子東宮 昭彦中川 光弘
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2018 年 127 巻 2 号 p. 289-301

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 Toya caldera, eastern Hokkaido, was formed approximately 110 ka, and has two post-caldera volcanoes, Nakajima and Usu volcano. Caldera-forming eruptions ejected a large-scale Toya pyroclastic flow, and related co-ignimbrite ash which covered a wide area in northern Japan. Usu volcano is one of the most active volcanoes in Japan, and has had repeated magmatic eruptions during historical time since AD 1663. The latest major eruption occurred in AD 2000. General geology and representative outcrops of eruptive deposits from Toya caldera and its post-caldera volcanoes are introduced, on the basis of a training field course at the 6th IAVCEI Collapse Caldera Workshop held in September 2016.

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