Landslides
Online ISSN : 1884-3956
Print ISSN : 0285-2926
ISSN-L : 0285-2926
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Volume 17, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • Relation of Landslide to Geology in Niigata Prefecture
    Yasumasa FUKUMOTO
    1980 Volume 17 Issue 3 Pages 1-11_1
    Published: December 25, 1980
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.17.3_1
    JOURNAL FREE ACCESS
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    In this report I tried to elucidate the relation to landslide to geology and geologic structure. According to the geologic features, I divided Niigata Prefecture into 7 areas, investigayed landslides statistically in each formation in each area, and pointed out the features of each formation and the circumstances of occurrences of landslides.
    I also tried to make clear the relation between the landslides of each formation and the geologic structure: for every formation, I investigated the relation of landslide to anticlinal and synclinal structures, and that of landslides of faults and intrusive rocks. In adition, I studied the features of Nagare-ban (dip side creep), Uke-ban (up-dip creep), and Soko-suberi strike side creep.
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  • On the Landslides and Earth Failures in the Middle Reaches Area of the Himekawa River
    Shuji KITAZAWA
    1980 Volume 17 Issue 3 Pages 12-21_1
    Published: December 25, 1980
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.17.3_12
    JOURNAL FREE ACCESS
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    After our investigations of areas along the middle reaches of the Himekawa River, on geologic and topographic features and on the distribution of landslides and earth failures, we co ld find some facts as follows:
    1) Most of landslides are distributed on open, deeply dissected erosion-valleys. Slopes of them show a rormal distribution with the mode value of 15°-20°gradient; landslides are intensively concentrated on the mudstone zone of tertiary. We found 86 percent of landslides occurred on the existing earth fault, and those of a large scale often on the effusive rocks areas, accompanied by head failure.
    2) Most of earth failure seem to be found, topogrphically, on the younger stage valley, among direct bottom of flat land; and on slopes supporting cap rocks and among ridges. Slopes of those show a normal distribution with the mode value of 45°-50°gradient, intensively on slopes at the foot of a mountain.
    3) About landslides and earth failures, we should not overlook human antivities, such as water ways overflowed or destroyed, and rude management of forest land.
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  • Erratum to : Fluctuation Behavior of Groundwater Analysis in Landslide Area
    1980 Volume 17 Issue 3 Pages 22
    Published: 1980
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.17.3_22
    JOURNAL FREE ACCESS
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  • Geology and Groundwater in Yokoo Landslide
    Kojiro KASHIWABARA, Naoya MATSUMOTO
    1980 Volume 17 Issue 3 Pages 23-29_1
    Published: December 25, 1980
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.17.3_23
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    It is 15, 000 years or more since Yokoo Landslide came into action. Thick debris was piled up in stratification.
    Groundwater divides in to unconfined and artesian ones. Both of them gather at the toe of a moving mass. We cannot find each head of aquifers but a combined piezometric level in the borehole which combines shallow and deep aquifers. The former supplies the latter with groundwater. Its quantity grows according to rainfall.
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 17 Issue 3 Pages 30
    Published: December 25, 1980
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.17.3_30
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1980 Volume 17 Issue 3 Pages 31-48_1
    Published: December 25, 1980
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.17.3_31
    JOURNAL FREE ACCESS
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