Quantitative eruption history of Pleistocene Daisen Volcano, SW Japan.

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  • Yamamoto Takahiro
    AIST, Geological Survey of Japan, Research Institute of Earthquake and Volcano Geology

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  • 大山火山噴火履歴の再検討
  • オオヤマ カザン フンカ リレキ ノ サイケントウ

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<p>Daisen Volcano is a large dacitic composite volcano in the San-in district, SW Japan. This volcano has sometimes ejected wide-spreading pyroclastic fallouts along the Japanese islands during the Pleistocene time. The largest of them is the Daisen-Kurayoshi Pyroclastic Fall Deposit (DKP) at 60 ka. In this study, I revised quantitative eruption history of the volcano, because previous studies had involved stratigraphic and methodological problems. Firstly, there were different opinions about which the youngest product was the Misen Lava Dome or Sankoho one. New 14C dating has revealed that the Misen and Sankoho eruption occurred at 28.6 and 20.8 ka, respectively. Secondary, volumes of the pyroclastic fall deposits from this volcano were measured in the database of Suto et al. (2007, Bull. Geol. Surv. Japan, vol. 58, p. 337–352); they diagrammatically redraw the isopachs of the deposits in previous studies. However, their results ignored the distal distributions of the fallouts and underestimated the volumes of the deposits. So, the volumes of the pyroclastic fall deposits were newly determined by other methods using relationship between thicknes and area within an isopach. The revised quantitative eruptive history of the volcano since 210 ka shows that the magma discharge rate has increased at about 100 ka and DKP eruption took place during this high rate stage.</p>

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