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Characteristics of landslides caused by the 2018 Hokkaido Eastern Iburi Earthquake

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Abstract

The 2018 Hokkaido Eastern Iburi Earthquake struck the eastern Iburi region (epicenter: 42.691°N, 142.007°E, depth: 37.0 km) of Hokkaido, Japan, at 3:07.59 JST, September 6, 2018 (18:07.59, September 5, 2018 UTC). Many shallow landslides were triggered by this Mw 6.6 (Mj 6.7) earthquake. The basement complex in the affected area (sedimentary rocks) is covered with thick pyroclastic fall deposits derived from the Tarumae Volcano, etc., and the strong seismic shocks triggered shallow landsliding of them. Shallow landslides moving along valley type topography traveled greater distances than those moving along planar slope topography. Some shallow landslides occurred on relatively gentle slopes (< 30°). The earthquake also induced several large-scale deep-seated landslides, including one that has formed a landslide dam in the Hidaka-horonai River. Landslides were densely distributed over hilly regions (elevation: 200–400 m) within an area of approximately 400 km2 in Atsuma (landslides caused 36 deaths), Abira, and Mukawa, and the number of landslides and the total area of the landslides were the largest in Japan ever since the Meiji Era (1868–1912). The catchments where shallow landslides were concentrated were severely devastated.

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Acknowledgements

We are grateful to Pasco Corporation for the provision of SPOT satellite optical imagery, the Hokkaido development bureau of MLIT for access to helicopter “Hokkai”, and the survey team of the Japan Society of Erosion Control Engineering (Hokkaido branch), and Ms. Keiko Saito at the Laboratory of National Land Conservation, Hokkaido University for preparing the field surveys and data analyses.

Funding

This study was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI grants 18H03819, 18K19952, the Japan Society of Erosion Control Engineering, the MLIT Scientific Research and Development program “Mechanism and countermeasure for chained complex sediment-related disasters caused by major earthquake and deterioration of foundation caused by major earthquake”.

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Authors and Affiliations

  1. Research Faculty of Agriculture, Hokkaido University, Sapporo, 0608589, Japan

    Nobutomo Osanai, Takashi Yamada, Shin-ichiro Hayashi & Shin’ya Kastura

  2. Division of Earth and Planetary Dynamics, Graduate School of Science, Hokkaido University, Sapporo, 0600810, Japan

    Takahisa Furuichi

  3. Sustainability Research Centre, University of the Sunshine Coast, Sippy Downs, QLD, 4556, Australia

    Takahisa Furuichi

  4. Research Center for Environmental Education, Miyagi University of Education, Sendai, 9800845, Japan

    Takahisa Furuichi

  5. Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Ishikawa, 9218836, Japan

    Seiji Yanai

  6. Civil Engineering Research Institute for Cold Region, PWRI, Sapporo, 0628602, Japan

    Yasuhiro Murakami

  7. Shin Engineering Consultant, Co., Ltd, Sapporo, 0030021, Japan

    Tomoyoshi Miyazaki

  8. Research Faculty of Science, Institute of Seismology and Volcanology, Hokkaido University, Sapporo, 0600810, Japan

    Yuichiro Tanioka

  9. Sabo (Erosion and Sediment Control) Planning Division, Ministry of Land, Infrastructure, Transport and Tourism, Tokyo, 1008918, Japan

    Shigetaka Takiguchi

  10. Pasco Corporation, Tokyo, 1530042, Japan

    Mayumi Miyazaki

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  1. Nobutomo Osanai
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  2. Takashi Yamada
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  3. Shin-ichiro Hayashi
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Correspondence to Shin-ichiro Hayashi.

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Osanai, N., Yamada, T., Hayashi, Si. et al. Characteristics of landslides caused by the 2018 Hokkaido Eastern Iburi Earthquake. Landslides 16, 1517–1528 (2019). https://doi.org/10.1007/s10346-019-01206-7

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