有珠山2000年噴火でもたらされた火砕物の層序(<特集>2000年有珠山噴火 (3)) Stratigraphical Sequence of the Pyroclastic Deposits Derived from the Usu 2000 Eruption(<Special Section>The 2000 Eruption of Usu Volcano (3))

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The volcanic activities of the Usu 2000 eruption were monitored and reported by many scientists and the mass media. Summarizing these observation results, most of relatively large explosion events occurred during March 31 to April 7, 2000. Around the Nishiyama and Kompira crater groups, the pyroclastic deposits with multi units can be divided into 19 layers on the basis of their visible color, grain size and sedimentary structure; from Layer A to Layer S in ascending order. The eruptive dates of each layer inferred from the wind directions, the eruptive sequence, and the distribution of deposits are summarized as follows; the Layer A, characterized as the light gray color ash fall deposit including in some pumice layers, was generated by March 31 phreatomagmatic explosions occurred at Nishiyama crater group. The Layer B, composed poorly sorted breccia and ash layer with gray color, was generated on March 31 p.m. at Nishiyama craters. The Layer C to the Layer G, dark brown-gray aggregate ash, were derived from the volcanic eruptions occurred on April 1 to 2 in Nishiyama and Kompira crater group. The Layer H to Layer M and Layer O, mainly consist with gray and reddish brown aggregate ash including in lithic fragments, were generated during April 3 and 4 in Kompira crater group. The Layer N, which distributes around N19 crater, generated on April 4. The Layer P, massive ash with gray color, was generated on April 6 in Kompira crater group. After April 7, the Layer S, characterized as light brown aggregate ash, has been generated from the recent minor activities around limited craters. The amount of Layer A fallen in the range from the source to Toyako Onsencho Town is estimated at 1.2×10<sup>8</sup> kg, and total amount of Layer A including in the distal area is 2.4×10<sup>8</sup> kg. On the other hand, amount of other deposits generated during April 1 to 6 (e.g. Layer B, N, and Q) is an order of 10<sup>6</sup>-10<sup>7</sup> kg. Total amount of the pyroclastic deposits erupted from the Usu 2000 eruption is more than 6.4×10<sup>8</sup> kg.

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  • 火山

    火山 47(5), 619-643, 2002

    特定非営利活動法人 日本火山学会

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  • NII論文ID(NAID)
    110003041288
  • NII書誌ID(NCID)
    AN10512786
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0453-4360
  • NDL 記事登録ID
    6398508
  • NDL 雑誌分類
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL 請求記号
    Z15-101
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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