Abstract
The author deals with two active faults (earthquake fault) of M7 class which worked in relation to the Northeast Pacific Ocean off earthquake on March 11, 2011, and summarizes the relationship between the scale of mass movement and the distance from active fault. The result is as follows : I, During the Iwaki earthquake whose active fault was anormal fault, mass movements occurred on the hanging wall within 2 km from the active fault rupture, and large-scale landslide (>1,000,000 m3) occurred in the range within 0.5 km. II, During the northern Nagano earthquake, mass movements occurred on the hanging wall within 10 km from the active fault rapture of a reverse fault, and large-scale mass movements occurred within 3 km from the fault.
