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Differences in factors determining landslide hazards among three types of landslides in Japan

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Abstract

The motivation for this study was to clarify the factors that affect landslide occurrences at the national level in Japan and differences in the factors that result from landslide types. The factors that cause differences in the number of rainfall-triggered landslide disasters in 47 Japanese prefectures were examined using generalized linear models. The analysis was conducted for each of the three types (i.e., steep-slope failure, deep-seated landslide, and debris flow) of landslide disasters. For all types, the rainfall index and the number of landslide-prone areas were selected with positive coefficients while the accretionary complexes geological type was selected with negative coefficients. For steep-slope failure, forests and land for buildings were selected with negative and positive coefficients, respectively. For deep-seated landslide and debris flow, land use was seldom selected. Thus, the factors were found to have differed as a result of the landslide type. Because the number of landslides alters the fatalities and building damage in Japan, this study contributes to the prioritization of landslide countermeasures at the national level.

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Acknowledgements

This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number JP21K04590. We thank Martha Evonuk, PhD, and Leonie Seabrook, PhD, from Edanz, for editing a draft of this manuscript.

Funding

This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number JP21K04590.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were mainly performed by Yuta Watanabe and partly by Yoshinori Shinohara. The first draft of the manuscript was written by Yoshinori Shinohara. All authors read and approved the final manuscript.

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Correspondence to Yoshinori Shinohara.

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Shinohara, Y., Watanabe, Y. Differences in factors determining landslide hazards among three types of landslides in Japan. Nat Hazards 118, 1689–1705 (2023). https://doi.org/10.1007/s11069-023-06075-x

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  • DOI: https://doi.org/10.1007/s11069-023-06075-x

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