BackgroundDaisen volcano overlooking the Japan Sea has been the source of large explosive eruptions during the late Pleistocene. The last dated major eruption took place about 17,000-18,000 years before present, but at least one large tephra deposit is younger (Machida and Arai, 1992). Although included in a list of volcanoes with eruptions in the past 2000 years (Hayakawa, 1994a), the list includes some youthful volcanoes that are not Holocene in age, and the latest eruption of Daisen occurred during the late Pleistocene (Hayakawa 1996, pers. comm.). The volcanic products mostly consist of biotite and hornblende andesites (Matsuhisa and Kurasawa, 1983).
Source: Smithsonian / GVP volcano information
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