Global Volcanism Program | Image GVP-02060
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 caldera 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 part of the caldera and formed the center peak.
Photo by Ichio Moriya (Kanazawa University).
Keywords: lava dome