５万分の１地すべり地形分布図を用いた地すべり地形解析

DOI Web Site 被引用文献3件 参考文献25件

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タイトル別名
  • Morphometric analysis of landslides based on landslide maps.
  • 5マンブン ノ 1 ヂスベリ チケイ ブンプズ オ モチイタ ヂスベリ チケイ カイセキ

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We morphometrically studied landslide features and mobility using 1: 50, 000-scale landslide maps issued by the National Research Institute for Earth Science and Disaster Prevention (NIED) of Japan. We selected 3 study areas 19 x 22 km each-the Hachimantai area composed of Quaternary volcanic rock, the Kiyokawa area of Tertiary sedimentary rock, and the Ichinose area of crystalline schist. We found that the number of landslides and slide directions were strongly regulated by geological structures in Tertiary sedimentary rock and crystalline schist. At all 3 locations, most landslide masses were longer and narrower than their source areas. In the Kiyokawa area, however, half of the number of landslidemasses were wider than their source areas . We characterized ranges of the slope angle of source areas and the equivalent coefficient offriction H/L of landslide masses as an index of landslide mobility in each test area, where L is the horizontal distance and H is the relative landslide height . H/L proved to be proportional to the slope tangent of the source area at all locations . The large surface displacement of almost all landslides exceeded the critical strain to slide, indicating that almost all landslides collapsed and slid. Our data should prove useful in predicting and mitigating landslide disasters, and further analysis of wider areas should yield even more practical information

収録刊行物

  • 地すべり

    地すべり 39 (2), 244-252, 2002

    公益社団法人 日本地すべり学会

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