Re-evaluation of the history of phreatic eruptions from Atosanupuri Volcano, eastern Hokkaido, Japan:

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  • Hasegawa Takeshi
    Department of Earth Sciences, College of Science, Ibaraki University
  • Nakagawa Mitsuhiro
    Department of Natural History Sciences, Graduate School of Science, Hokkaido University
  • Miyagi Isoji
    Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology

Bibliographic Information

Other Title
  • 北海道東部，アトサヌプリ火山における水蒸気噴火の発生履歴：
  • 北海道東部,アトサヌプリ火山における水蒸気噴火の発生履歴 : 炭素年代および気象庁ボーリングコアからの検討
  • ホッカイドウ トウブ,アトサヌプリ カザン ニ オケル スイジョウキ フンカ ノ ハッセイ リレキ : タンソ ネンダイ オヨビ キショウチョウ ボーリングコア カラ ノ ケントウ
  • Re-evaluation of the history of phreatic eruptions from Atosanupuri Volcano, eastern Hokkaido, Japan: inferred from 14C ages, borehole cores of Japan Meteorological Agency
  • Inferred from <sup>14</sup>C ages and borehole cores of Japan Meteorological Agency
  • 炭素年代および気象庁ボーリングコアからの検討

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<p>Atosanupuri Volcano is one of the active volcanoes, located in the Akan-Shiretoko Volcanic Chain, eastern Hokkaido. Tephro-stratigraphic and tephro-chronologic studies were conducted on two drill cores and new outcrops around the volcano to reveal a recent history of the explosive eruptions. Widespread tephra layers, such as the 10th century B-Tm tephra, and the 2.7 cal. ka BP Ta-c2 tephra were distinguished by the geochemical composition of volcanic glass. In addition, 14C ages of organic samples underlying the eruption deposits were obtained. Using these data, we identified seven phreatic eruption deposits, At-ph1 to At-ph7, overlying the T-c2 tephra; these include the previously described At-a and At-b tephras. At-ph7 yields the oldest 14C calibrated age (2.5-2.7 cal. ka), and the deposition ages of At-ph6 to At-ph1 range from cal. AD 554 to 1678. At-ph4 (At-b) is the thickest phreatic ejecta, with a volume of ~3 × 106 m3. Five phreatic eruptions occurred from Atosanupuri Volcano between 1,500 and 1,000 cal. BP. The youngest eruption, At-ph1 (At-a) occurred at 300 ~ 400 cal. BP, which might be documented in historical records.</p>

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