Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
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Volume 60, Issue 4
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  • Landslides Triggered by the 2018 Hokkaido Eastern Iburi Earthqu ake
    Koji UMEDA, Kaori CHIYOYA, Masatoshi SHIBA, Misaki KONDO
    2019 Volume 60 Issue 4 Pages 172-179
    Published: October 10, 2019
    Released on J-STAGE: March 13, 2020
    DOIhttps://doi.org/10.5110/jjseg.60.172
    JOURNAL FREE ACCESS
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    A catastrophic landslide induced by the 2018 Hokkaido Eastern Iburi earthquake occurred on a slope of distal tephra deposits, which is the largest historic landslides in Japan with an area of 13.4 km2. Such landslides do not occur on steep slopes because the tephra deposits themselves do not form slopes steeper than the angle of repose, and occur on gentle slopes shallower than 30°. Geochemical data for the pyroclastic fall deposits indicate sliding surfaces in halloysite-rich weathered pumice fall（loam）could facilitate the effective transf er of land slide mass on gentle slopes.

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