伊那谷の土石流と満水 (災害とその予測--第4紀研究の果たす役割<特集>)

概要

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Local unusual heavy rainfalls by baiu frontal activity on the Ina basin caused 130 dead or missing persons and damage of 34 billion yen in 1961. This huge disaster was called the“Saburoku-sai” (Showa-36 Disaster) in Japanese.On the 30th anniversary of the“Saburoku-sai”, in 1991, an exhibition was held on the disaster, accompanied by the publication of a volume on “Debris flow and“Man-sui”in the Ina valley”and maps of the disaster and of active faults in the Ina valley.Disasters of the Ina valley are usually caused by mass ground movement. Several disasters similar to the“Saburoku-sai”appear in the historical records. These disasters, accompanied by many debris flows, called“Man-sui”, have been feared because the disaster covers the entire Ina basin.“Debris flow and“Man-sui”in the Ina valley” describes the Ina valley's geomorphological and geological conditions that make it vulnerable to mass movement, and shows types and predictable areas of natural disasters in the valley.