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3. 3) CHIGIRA, M. (1982) : Dry debris flow of pyroclastic fall deposits triggered by the 1978 Izu-Oshima-Kinkai earthquake: the “collapsing” landslide at Nanamawari, Mitaka-Iriya, southern Izu Peninsula, Journal of Natural Disaster Science, Vol.4, No.2, pp.1-32.