Deep-seated Catastrophic Landslides Induced by Typhoon 1112 (Talas)

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Other Title
  • 2011年台風12号による深層崩壊

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Abstract

Typhoon 1112 crossed the Japanese Islands from 2 to 5 September in 2011, brought more than 2000 mm rainfall, and induced more than 50 deep-seated catastrophic landslides of Jurassic to Palaeogene sedimentary rocks. We studied fourteen landslides by using 1m-DEMs or aerial photographs and field survey to clarify that all of these occurred on slopes with scarplets or a linear depression along their future crowns. These scarplets and a linear depression were 2 m to 50 m high, and are scarcely observable on the aerial photographs without particular attention. Horizontal length ratio between the scarplets and slopes along slope lines were 5 to 21 %, suggesting that "strains" before the failure were relatively small. Gravitational deformations were mainly due to sliding along wedge-shaped discontinuities. Nineteen landslides that have been specified for their occurrence time, were preceded by rainfalls exceeding 700 mm on the basis of amount of precipitation analyzed by rader-AMeDAS.

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Details 詳細情報について

  • CRID
    1050845760672599808
  • NII Article ID
    120004945155
  • NII Book ID
    AN00027809
  • ISSN
    0386412X
  • HANDLE
    2433/161808
  • Text Lang
    ja
  • Article Type
    departmental bulletin paper
  • Data Source
    • IRDB
    • CiNii Articles

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