Landslides
Online ISSN : 1884-3956
Print ISSN : 0285-2926
ISSN-L : 0285-2926
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Volume 33, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • Relationship of the landslide to faulting in the Shiretoko Peninsula, East Hokkaido, Japan
    Yoji ITO
    1997 Volume 33 Issue 4 Pages 1-7
    Published: March 15, 1997
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.33.4_1
    JOURNAL FREE ACCESS
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    In the Shiretoko Peninsula, East Hokkaido, large landslides, such as the Aidimari Collapse, Kamoiunbe Debris Avalanche, Kuzurehama Debris Avalanche, Minamidake Debris Avalanche, Onnebetsudake Northwest Collapse and Onnebetsudake Southeast Slump/Slide, are identified along the faults that displaced Quaternary lava flows and lava domes. These large landslides are geologically influenced by the active faults, as well as caprock structures and instability of stratovolcanoes. Moreover, the earthquakes and volcanic activity, accompanying faulting, are possibly immediate causes of large landsliding.
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  • A Prediction of Slip Surface Depth by using A Fuzzy Inference Method with Genetic Algorithm
    Hiroyuki YOSHIMATSU, Kunio KURORAWA
    1997 Volume 33 Issue 4 Pages 8-13
    Published: March 15, 1997
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.33.4_8
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    A decision of slip surface depth is the most important subject on the discussion of landslide mechanism and the making plan of prevention measures. This paper discusses the probability of prediction of the slip surface depth by using a fuzzy inference method. In this analysis, firstly, a fuzzy relation matrix method is applied to the selection of factors using in the fuzzy inference. Secondary, the most suitable membership shape meaning as a probability distribution is decided from the self-tuning of fuzzy inference by using a genetic algorithm with the selected factor data. The result obtained from the inference method constructed by the above described procedures has good correlation with the observed depth. Weight Coefficients of the inference rules show the significant factors in the proportion to the arrangement order of landslide width, length and uneven ground counter.
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  • Classification of Landslide Types by Fuzzy If-then Rules Method
    Hiroyuki YOSHIMATSU, Masasuke WATARI
    1997 Volume 33 Issue 4 Pages 14-19
    Published: March 15, 1997
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.33.4_14
    JOURNAL FREE ACCESS
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    Classification procedures of landslide types are presented in order to understand the landslide characters up to now. However, the results obtained from the discussion of type's classification can not be generally applied to the planning of landslide preventions because of the existing fuzziness of classification criteria.
    This paper discusses a fuzzy-rule based classification system for landslide types. In the system, a genetic algorithm is introduced to select the effective if-then rules that are consisting the non-symmetric triangle fuzzy subspace of different size. It is shown that the classification of landslide types can be performed by a small number of fuzzy if-then rules through the numerical examples and the proposed method can be also used for the quantitative valuation of empirical information.
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  • Slides Occurring in Hydrothermal Alteration Zones: Example from Sattomonai-Okushunbetsu Slide Area in Teshikaga District, Hokkaido, Japan
    Hiroyuki MAEDA, Satoru SASAKI
    1997 Volume 33 Issue 4 Pages 20-25
    Published: March 15, 1997
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.33.4_20
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    The geology of the Sattomonai-Qkushunbetsu slide area consists primarily of andesitic or dacitic lavas and volcaniclastic rocks from the Middle Miocene, Upper Miocene, and Pliocene Series, as well as Pliocene andesite and rhyolite dikes. The Hydrothermal alteration zones that formed in this slide area during the Pliocene Age consist of smectite, zeolite, chlorite, interstratified illite/smectite, and illite zones. Three ancient slides are known to have occurred in this area. One is distributed on the fine tuff of the Upper Miocene Hanakushibe Formation, which is a smectite zone, and the other two are primarily distributed on the lapilli tuff of the Lower Pliocene Ikurushibeyama Lava, which is an interstratified illite/smectite zone. The ancient slides in these hydrothermal alteration zones are believed to have been caused by a swelling of clay minerals such as smectite or interstratified illite/smectite.
    An understanding of geophysical stresses in hydrothermal alteration zones is useful when evaluating contemporary slide hazards and constructing hazard maps of ancient hydrothermal fields.
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  • Research on a Method of Estimating the State of the Flow of Ground Water in Landslide Areas
    Kiyoteru MARUYAMA
    1997 Volume 33 Issue 4 Pages 26-32
    Published: March 15, 1997
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.33.4_26
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    This paper reports on a study performed to develop a method of estimating the state of the flow of ground water within landslide slopes by adding statistical methods to the past organization method based on a graph of the results of a water quality investigation.
    The following results were obtained.
    (1) The study demonstrated an estimation method that finds the number of sources of the ground water flowing downwards in a landslide slope, the sources of this ground water, and the flow channel of the ground water by performing principal component analysis and cluster analysis of the results of a water quality investigation of the ground water.
    (2) The results of a verification of the suitability of this estimation method done using test data revealed that the number of sources of the ground water and the percent of each of the ground water's components could be accurately determined as similarities.
    (3) A trial application of the method at the Konota landslide demonstrated that it is possible to estimate the number of water sources of the ground water in the landslide rock, source of the ground water, and the ground water downward flow channels.
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  • Results of Analysis of Ground Water Logging in Landslides
    Kiyoteru MARUYAMA
    1997 Volume 33 Issue 4 Pages 33-39
    Published: March 15, 1997
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.33.4_33
    JOURNAL FREE ACCESS
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    This thesis investigates a method wherein the underground water flow layer can be ascertained more precisely than in former methods by using the results of ground water logging in slopes of landslides. As a result, it was determined that the method of principal component analysis of data over time of electric conductivity obtained by the results of ground water logging is an effective method of precisely ascertaining the underground water flow layer.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1997 Volume 33 Issue 4 Pages 40-50
    Published: March 15, 1997
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.33.4_40
    JOURNAL FREE ACCESS
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