大隅降下軽石に伴う垂水火砕流の発生・堆積様式 Mechanism of Generation and Emplacement of the Tarumizu Pyroclastic Flow Associated with Osumi Plinian Eruption from Aira Caldera, Japan

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著者

    • 福島 大輔 FUKUSHIMA Daisuke
    • 鹿児島大学理学部地球環境科学教室 Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University
    • 小林 哲夫 KOBAYASHI Tetsuo
    • 鹿児島大学理学部地球環境科学教室 Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University

抄録

The Tarumizu pyroclastic flow deposit with intercalation of Osumi plinian fall deposit of 25 ka eruption is distributed in Tarumizu area, southeast of Aira caldera. The deposit is composed of many flow units and the source is estimated to be at the same position as the vent of plinian eruption based on grain-size variation and depositional structure. From these facts, the Tarumizu pyroclastic flow is considered to be a type of intra-plinian fiow generated by successive partial collapse of the sustained plinian eruption column. Based on the stratigraphic suecessions, the generation of this flow is estimated to be a continuous process from the early to the terminal stage of the plinian eruption. The pyroclastic flow distribution, which is in the same direction with the dispersal axis of plinian fall deposit, may suggests that the wind influenced the direction of partial column collapse. Two lithofacies were identified in the Tarumizu pyroclastic flow deposit: the massive facies and the stratified facies. The former is a 'normal' pyroclastic flow, while the latter is a pile-up of many thin layers of pyroclastic flow and pumice fall. The massive facies are mainly distributed on the lower plain near the coast and differ from the stratified facies that accumulated at a bit higher level, usually along the foot of the mountain. These facts suggest that the main pyroclastic flow accumulated on the lower level and that the corresponding marginal part of the flow eventually reached the higher level exhibiting characteristic thin stratified structure.

収録刊行物

  • 火山

    火山 45(4), 225-240, 2000

    特定非営利活動法人 日本火山学会

参考文献:  38件中 1-38件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    110003041195
  • 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
    5468246
  • 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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