Abstract
Early in the morning on 4th July, 1981 a large soilfall broke out on the hillside behind Honkakuji temple, Etajima in Hiroshima Prefecture. Old men, who attended the mass in the hall, were killed and injured.
This soilfall is considered the landslide, because it is large scale and the time of occurrence of slope failure is about 6 hours after the peak of rainfall.
Then we investigated the cause of this landslide by geological survey, boring, seismic prospecting, electrical prospecting and natural radioactivity survey.
According to this investigation, it is considered that underground water, which was due to this disaster, flowed from the fracture zone, to the north and north-east, and acted as the uplift from behind the failure slope.
