Mechanisms of long travelling Aratozawa Landslide on gentle sliding surface in consolidated silt

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Skeletal structure in soil from a sliding surface of Aratozawa Landslide was investigated to reveal the sliding mechanisms using Cryo-SEM. Many cylindrical and latticed grains were found in silt stone that formed the sliding surface of the landslide, while those were not found in the tufa that overlay the silt. Crushing of cylindrical and latticed grains was likely leading to pore-fluid pressure build-up resulting in the long travelling distance (300m) on the gentle slope (< 4 degrees) of the Aratozawa Landslide.