十勝岳・富良野川における大正泥流の流下状況
体験者への聞き取りから
1995 年 47 巻 5 号 p. 30-35
詳細
1995 年 47 巻 5 号 p. 30-35
On May 24, 1926, Mt. Tokachi Volcano in Hokkaido erupted violently, thereby triggering in mudflow. A major mudflow destroyed Kami-Furano town at the foot of Mt. Tokachi, killing 137 people. We have surveyed the mudflow according to interviews with the mudflow witnesses and investigated the sites of witnesses observation.
We have estimated the state of mudflow descent at each area based on the results of the survey. The state of mudflow can be divided into: I) a flow whose velocity of more than 40-60km/h and wave height of 5-7m can cause a destruction of a house at the foundation, II) a flow whose velocity of 20-30km/h and wave height of 1-3.5m can cause a collapse of a house, and III) a flow whose velocity and wave height is lower than II) can not destroy a house.
