1792年(寛政4年)の眉山大崩壊の地形学的一考察

Abstract

A large part of Mt. Mayo collapsed in 1792. The landslide has been attributed to two causesone a volcanic explosion and the other an earthquake. The latter cause has been stated by a recentexplorer.The writer has carried out geomorphological studies of the Mayu-yama great landslide bycomparing it with the same phenomena in other places. The results of the studies are as follows.1) Mayu-yama is composed of large hourse-shoe shaped cliff and many small hills spread overit's front area.2) The same topography is recognized in the volcanic area in every other place, and it is well-known having been discovered in the twenty-Ist year of the Meiji eruption of Mt. Bandai.3) In view of those facts, the cause of Mayu-yama great landslide seem to have derived froma volcanic explosion due to conditions existing at the time.