Displacement and fluctuation in pore water pressure of active landslide area by the Mid Niigata Prefecture Earthquake

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  • OKAMOTO Takashi
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute
  • MATSUURA Sumio
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute
  • ASANO Shiho
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute
  • TAKEUCHI Yoshitsugu
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute

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  • 活動中の地すべり地における中越地震発生時の移動および間隙水圧変動特性
  • カツドウ チュウ ノ ジスベリチ ニ オケル チュウエツ ジシン ハッセイジ ノ イドウ オヨビ カンゲキ スイアツ ヘンドウ トクセイ

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Abstract

The authors analyzed the landslide displacement and fluctuation of pore water pressure at a reactivated landslide which moves more than one meter a year in Niigata Prefecture from the results of monitoring every ten minutes. The distribution of landslide displacement caused by the earthquake matched that caused by rainfall. Pore water pressure showed variations at each monitored point. Considering a relationship between the distribution of landslide deformation and of the pore pressure, the variation in pore water pressure is considered to be generated by local compression or extension in the landslide mass. Although the amount of landslide movement was large before the earthquake, it fell immediately after the earthquake, and remained low until the beginning of the next snow-melt season.

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