Some Remarks on Landslide Mechanism

Observation at Irahara Landslide

Abstract

Explanation of landslide mechanism is described from every minute records of internal strain meter. Analysis of the onset time of these records makes it clear that rupture occures at lower part in the upper landslide slope and is propagated to upper slope at a few meters per an hour, and rupture occures at upper part in the middle landslide slope and is propagated to lower slope at a few meters per an hour. The records close to the landslide surface clarify that rise time in landslide is a few hours. The displacement at the landslide surface is propagated to the ground surface with a velocity above a half meter per a minute.