Abstract
As a case of the seismic landslide, Kaerigumo collapse occurred in the Atotsu-gawa shattered zone due to the Tensho great earthquake (1586). The debris formed by the landslide dammed up the main course of the R. Sho, taking shape of a natural dam for a time. Owing to the extraordinary geographical phenomenon, villages wero buried under debris and a number of people fell dead. The quantity of the debris produced by the landslide is estimated at about 9×106m3.
