土砂供給源としてみた日本の第四紀火山における巨大山体崩壊 Catastrophic Sector Collapses of Quaternary Volcanoes as Significant Sediment Sources in Japan

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 The Japanese Islands are tectonically active and humid. Thus, erosion and deposition are the primary processes controlling geomorphic development. Catastrophic sector collapses at volcanoes should be considered significant in this context. This study examines the geomorphological role of volcanic sector collapses in Japan, introducing 58 cases with their respective occurrence ages and volumes (≥ 1×10<sup>8</sup> m<sup>3</sup>). We find that the frequency of sector collapses becomes exponentially higher as the collapse magnitude decreases. The total volume of the dissected volcanic edifice caused by catastrophic collapses amounts to ca. 6.4 km<sup>3</sup> (640×10<sup>8</sup> m<sup>3</sup>) during the last 500 years. This value can be translated into an annual denudation rate of 0.53 mm/y per unit area of the Quaternary volcanoes (<i>ca.</i> 24000 km<sup>2</sup>), which is comparable to the contemporary denudation rate of non-volcanic mountains in Japan. Therefore, although volcanic sector collapses occur intermittently, we have to consider them as sediment sources that are indispensable to an understanding of geomorphology in Japan.

収録刊行物

  • 地學雜誌

    地學雜誌 119(3), 568-578, 2010-06-25

    公益社団法人 東京地学協会

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各種コード

  • NII論文ID(NAID)
    10030369746
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    SHO
  • ISSN
    0022135X
  • NDL 記事登録ID
    10758301
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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