ABSTRACT
This paper presents the results of an investigation for slope failure and landslide hazard zonation based on geological and topographical analysis.
The authors describe the results that slope failures and landslide concentrate around the erosion front at the surface consisted of unconsolidated Quaternary sediments such as Kushiro group in Hokkaido district.
Moreover, we investigate for the relationship of topographical, geological conditions and long-term stability of slopes by studying about one hundred slopes in Suzuka range of Siga prefecture. In this area distributed granite where weathering zone is thick at the surface, many slope failures are situated in the zone across the erosion front and weathering front.
