Global Volcanism Program | Image GVP-01430
The most prominent feature on the upper SE flank of Ontake volcano is the headwall scarp of a volcanic landslide. The landslide occurred on 14 September 1984 with no associated eruptive activity. The resulting debris avalanche traveked 13 km down the Nigori and Otaki river valleys.
Photo by Lee Siebert, 1988 (Smithsonian Institution).