The N flank of Chokaisan was the source of a large debris avalanche about 2,600 years ago that traveled 25 km into the Japan Sea and underlies much of the foreground area. Collapse of the summit left a 3 x 4 km open scar with the eastern rim forming the left-center peak, and the western rim to the right. Following the collapse, a series of lava domes and lava flows filled the upper area and formed the center peak.

Photo by Ichio Moriya (Kanazawa University).

This image is made available under the Creative Commons BY-NC 4.0 license terms.

Keywords: lava dome

Chokaisan