Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
Volume 62, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Kazuhiro AOKI, Yukumo TANAKA, Takumi YOSHIDA, Koji SHIMADA, Toru SAKAI ...
    2021 Volume 62 Issue 2 Pages 64-81
    Published: June 10, 2021
    Released on J-STAGE: November 07, 2021
    JOURNAL FREE ACCESS

    Co-seismic surface ruptures in the Fukushima-ken Hamadori Earthquake of Mw 6.7 on April 11, 2011 exposed approximately 14 km trending NNW-SSE from Nameishi to northwest of Ishizumi Tsunaki of Tabito Town, Iwaki City and were newly named the Shionohira Fault. However, no surface ruptures appeared along an N-S trending non-activated Kuruma fault extending 5 km south of the Shionohira Fault. Because of the proximity and similar strike, two locations in Shionohira Fault and one location in Kuruma fault were selected as the study area for the fault activity evaluation. The present study reports the results of a series of geological and drilling surveys, core observation, XRD, isotope, and fluid inclusion analyses, and water permeability test. The results obtained from the three locations offer a fundamental data base that can be utilized for fault activity evaluation by summarizing the geological, mineralogical, and fluid property characteristics of fault fracture zone.

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  • Hidehisa NAGATA, Setsuo HAYASHI, Shigeyuki SHINODA, Yukiyasu FUJII, Os ...
    2021 Volume 62 Issue 2 Pages 82-91
    Published: June 10, 2021
    Released on J-STAGE: November 07, 2021
    JOURNAL FREE ACCESS

    Landslide disasters in Gifu Prefecture induced by the heavy rain in July, 2018 were reported. Almost slope failures occurred in the latter half of the heavy rain period. Bedrocks of the failures are granite of the Hida Belt, sedimentary rocks of the Mino Belt, and the Nohi Rhyolites. Unconsolidated materials such as terrace deposit, colluvium, surface soil and embankment were also collapsed. Furthermore, many debris flow by which the movement of valley-floor deposit probably broke out. Disasters occurred abundantly in the area of which the cumulative precipitation exceeded 300 mm, whereas they were scattered otherwise than the cases of Uwajima,Ehime Prefecture and Kure, Hiroshima Prefecture where the high disaster density.

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  • Takuya JINUSHI, Hidehisa NAGATA, Yasuhisa HINO, Osamu FUSHIKI, Nobuyuk ...
    2021 Volume 62 Issue 2 Pages 92-103
    Published: June 10, 2021
    Released on J-STAGE: November 07, 2021
    JOURNAL FREE ACCESS

    Investigation results of the slope failures and debris flow which damaged the JR Takayama Line are reported. Two shallow landslides of 1,000 m3 order in volume occurred by the rainstorm in July, 2018. Failures were on the boundary between strongly weathered Jurassic Hida Granite and overlying soil. Failure materials moved rapidly and grew into debris flow involving valley bottom and valley side deposits especially in the lower part of the transportational area. At the upstream side of the embankment for railway resulting in overflowed and broken, debris of 9,000 m3 were deposited.

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