流れ山の分布にみる磐梯火山における1888年の山体崩壊量
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概要
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This study aims to investigate the sector-collapse volume of Bandai volcano, northeast Japan, at the 1888 event. For this example, there are some conflicting views concerning the volumetric magnitude at the collapse, which leads to fail to reach an agreement among researchers. My recent examinations would contribute to solve this matter because they have indicated the size-distance relationship of hummocks, even for part of a debris avalanche, can reveal the volumetric magnitude of the collapses. Generally, the sizes in areas of hummocks decrease with distance and can be expressed by an exponential function of travel distance for individual debris avalanches. Each avalanche has distinctive values of intercept and slope coefficients. In particular, the intercept coefficients show a high correlation with the collapse volume. This indicates the possibility that we can suppose the collapse volume only from a hummock distributional pattern of a certain avalanche, even if there lacks for the other data for estimation. From this point of view, in this research, I investigated the size-distance distribution pattern of hummocks for the 1888 case, in order to determine the collapse volume of Bandai volcano as follows. Similar to other cases already examined, hummock area decreases as an exponential function of distance also for the main depositional area of the 1888 debris avalanche. The approximate expression has a value of the intercept coefficient, which is a key to estimate the landslide volume, showing that the expected volume of the collapse is ca. 0.6 km^3. Namely, the longitudinal distribution pattern of hummocks shows the possibility that the collapse volume stays within smaller value than previously considered.
- 2012-01-25
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- 流れ山の分布にみる磐梯火山における1888年の山体崩壊量
- 日本における流れ山のサイズ分布