Mechanism of Landslide Composed of Strongly Weathered Mudstone Induced by the 2004 Mid-Niigata Earthquake

  • Keizo UgaiEmail author
  • Akihiko Wakai
  • Fei Cai
  • Seiichiro Kuroda


This paper reports the mechanism of a landslide composed of strongly weathered mudstone induced by the 2004 Mid-Niigata Earthquake. The size of the landslide is 250 m long, 150 m wide and 15 ~ 20 m deep. Undisturbed soil samples of strongly weathered mudstone were obtained from the soil layer near the assumed sliding surface by boring. Cyclic undrained triaxial tests performed on the undisturbed soil specimens revealed the possibility of the landslide mechanism that the excess pore water pressure was induced in the soils near the sliding surface by the cyclic earthquake shaking and the safety factor of the slope became fairly less than 1.0, which led to the long-distance sliding of the landslide.


Earthquake-induced landslide Geotechnical testing Landslide mechanism Weathered mudstone 



The present study was conducted as a “Research project for utilizing advanced technologies in agriculture, forestry and fisheries” with support from the Ministry of Agriculture, Forestry and Fisheries of Japan.


  1. Onoue A, Wakai A, Ugai K, Higuchi K, Fukutake K, Hotta H, Kuroda S (2006) Slope failures at Yokowatashi and Nagaoka college of technology due to the 2004 Niigata-ken Chuetsu earthquake and their analytical considerations. Soils Found 46(6):751–764CrossRefGoogle Scholar
  2. Wakai A, Ugai K, Onoue A, Kuroda S, Higuchi K (2010) Numerical modeling of an earthquake-induced landslide considering the strain-softening characteristics at the bedding plane. Soils Found 50(4):533–545CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Keizo Ugai
    • 1
    Email author
  • Akihiko Wakai
    • 1
  • Fei Cai
    • 1
  • Seiichiro Kuroda
    • 2
  1. 1.Civil EngineeringKiryu, Gunma UniversityKiryūJapan
  2. 2.National Institute for Rural EngineeringTsukubaJapan

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