Abstract
The 2018 Hokkaido Eastern Iburi Earthquake caused a large amount of slope failures and landslides 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 (Japan Meteorological Agency) 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. In addition, a large scale slide of rock slopes composed of mudstone also occurred in the Hidaka-Horonai river basin in Horonai district in Atsuma town, and its debris flowed into the river and caused the blockage of the river channel. This paper summarizes earthquake-induced damages on natural slopes and mechanical properties of Tarumae pyroclastic fall deposits.
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Acknowledgments
The author wishes to express their sincere gratitude to all those who provided us with valuable information, particularly the Hokkaido Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism and Hokkaido Government, and Dr. S. Kawajiri, Dr. W. Hirose and Dr. T. Watanabe (members of the Geo-hazard Investigation Committee of the 2018 Hokkaido Eastern Iburi Earthquake, JGS). This study was also undertaken with the financial supports of KAKENHI (Grant-in-Aid for Science Research (B) JP17H03318, JSPS and River Center of Hokkaido (General Incorporated Foundation, RIC).
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Kawamura, S. (2021). Lessons from Recent Geo-Disasters in Hokkaido Under Earthquake. In: Arbanas, Ž., Bobrowsky, P.T., Konagai, K., Sassa, K., Takara, K. (eds) Understanding and Reducing Landslide Disaster Risk. WLF 2020. ICL Contribution to Landslide Disaster Risk Reduction. Springer, Cham. https://doi.org/10.1007/978-3-030-60713-5_4
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DOI: https://doi.org/10.1007/978-3-030-60713-5_4
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