Classification of landslide types observed in the area of Shimajiri-mudstone, Okinawa Island-For the risk evaluation of landslide-

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  • 沖縄，島尻層群泥岩分布地域の地すべり類型区分の試み―地すべりの危険度評価に関連して―
  • オキナワ シマジリソウグン デイガン ブンプ チイキ ノ ジスベリ ルイケイ クブン ノ ココロミ ジスベリ ノ キケンド ヒョウカ ニ カンレンシテ
  • —For the risk evaluation of landslide—
  • ―地すべりの危険度評価に関連して―

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Abstract

Both the typological classification and the correlation of landslides observed in the area of Shimajiri-mudstone, Okinawa Island is researched. The landslides are classified into the first activated mudstone slides, the quasi-first activated mudstone slides and the re-activated colluvial-soil slides, and also among them have similar systems. The quasi-first activated mudstone slides have existing slide blocks within the lower part of these slide mass, and have the possibility of progressive failure of mudstone which is promoted through the release of stress equivalent to sliding mass. On the other hand, landslides which do not have those the existing slide blocks, are created by the release of insitu stress which is brought with human-induced land alteration.

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