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Rainstorm-induced landslides at Kisawa village, Tokushima Prefecture, Japan, August 2004

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Abstract

Heavy rain fell on the Shikoku area during Typhoon Namtheun, setting a new record for daily rainfall in Japan of 1317 mm. The rain which peaked at 120 mm/h, triggered numerous landslides in the Nakagawa basin of Tokushima Prefecture, Japan on August 1, 2004. Among them, four large, rapid, long-runout landslides were triggered at Kisawa village. Two people were caught in one landslide and disappeared without trace, and there was much property damage. Ring-shear tests on samples from the landslides showed that shear resistance was greatly reduced by high pore-water pressure after shear failure was triggered by the increase in ground-water level during the rain.

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Acknowledgment

Prof. Okabe of Tokushima University, Prof. Hiura of Kochi University, and Dr. Satofuka and Dr. Tsutsumi of Kyoto University, are thanked for their help and discussions in the field survey. Thanks also go to the Aioi Civil Office of Tokushima Prefecture and to the Kisawa Village office for their help in the field. Dr. M.J. McSaveney of Institute of Geological and Nuclear Science, Ltd., New Zealand, and Dr Stuart Dunning of Durham University, are greatly thanked for their comments that helped sharpen this paper

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Correspondence to Gonghui Wang.

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Wang, G., Suemine, A., Furuya, G. et al. Rainstorm-induced landslides at Kisawa village, Tokushima Prefecture, Japan, August 2004. Landslides 2, 235–242 (2005). https://doi.org/10.1007/s10346-005-0061-5

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  • DOI: https://doi.org/10.1007/s10346-005-0061-5

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