Prediction of location, falling direction and falling distance of earthquake-induced rock falls in granite area.

DOI IR Web Site 3 Citations 15 References
  • YOKOYAMA Shunji
    Natural Hazard Prevention Science Course, Department of Natural Environment Science, Faculty of Science, Kochi Univ.
  • MIZUGUCHI Shinichi
    Natural Hazard Prevention Science Course, Department of Natural Environment Science, Faculty of Science, Kochi Univ.
  • FUJITA Masayo
    Fukada Geological Institute
  • KAMO Misako
    Chiken Co. Ltd.
  • KIKUYAMA Hiroki
    Kawasaki Geological Engineering Co., Ltd. Kita-Nihon Branch

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Other Title
  • 花こう岩地域における地震時落石の発生場所・落下方向・到達距離の予測
  • 花崗岩地域における地震時落石の発生場所・落下方向・到達距離の予測
  • カコウガン チイキ ニ オケル ジシンジ ラクセキ ノ ハッセイ バショ ラッカ ホウコウ トウタツ キョリ ノ ヨソク

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Abstract

This paper examined a prediction method of location, falling direction and falling distance of rock falls caused by horizontal earthquake motion in granite area. Many rock falls took place on mountain ridges and near convex break of slope where earthquake motion was probably amplified. Earthquake damages were bigger in ccomparatively fresh and fracture-poor granite than in strong-disintegrated or fracture-rich one. Then dominant movement types of earthquake-induced rock falls were of toppling and tumbling of large granite boulders on mountain ridges, jumping of large jointed blocks from fresh granite-outcropped scarps near convex break of slope and jumping of weak-disintegrated blocks from strong-disintegrated granite cliff near the top of road-cuts. The falling direction tends to orient perpendicular to the seismic faults. The distance of free falling from road-cuts tends to be come equal about to height of falling position. On the basis of these features this paper has proposed a tool for selection of location of earthquake-induced rock falls in granite area.

Journal

  • Landslides

    Landslides 39 (1), 30-39, 2002

    The Japan Landslide Society

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