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Hummocks are conically shaped mounds, which occur following catastrophic sector collapses, and are mainly observed around volcanoes. Empirical relationships of hummocks proposed by Yoshida et al. (2012) are basically applicable if hummocks now distributed on a debris avalanche depositional area do not have remarkable disturbances due to topographical barriers or modifications after deposition. Using these empirical relationships, the Old Yotei volcano, whose megacollapse in the Late Pleistocene has not been clarified yet, is examined. The results show that the size-distance relationship of hummocks (N=297), distributed west of the volcano can be expressed by an exponential function as,

chigaku zasshi/chigaku zasshi

Restored Image of Volcanic Sector Collapse at Old Yotei Volcano, Southwestern Hokkaido, Japan, from a Geomorphological Interpretation of the Distribution of Hummocks