The 2018 Hokkaido Eastern Iburi Earthquake caused a large amount of slope failures over a wide area.In particular, the enormous damage due to slope failures was centered in Atsuma and Abira town which are to the north of the epicenter. In Atsuma town, a seismic intensity of seven has been observed for the first time in Hokkaido, Japan. The geology in this region was mainly formed from three kinds of pyroclastic fall deposits (fa) erupted from Tarumae volcano, Eniwa volcano, and Shikotsu Caldera.Especially, the serious damage was generated in these tephra stratus. This report summarizes earthquake-induced damages on natural slopes, and presents physical feature and mechanical properties of the collapsed pyroclastic fall deposits distributed over this area.
平成30年北海道胆振東部地震で発生した斜面崩壊の特徴と地盤工学的考察
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