Global Volcanism Program | Image GVP-02245
Mashu is a 6-km-wide caldera on the northernmost Japanese island of Hokkaido, seen here from the SW rim with the Kamuishi Island lava dome in the center of the lake. It truncates a stratovolcano on the ESE rim of the larger Kutcharo caldera. The latest eruption of Mashu took place about 1,000 years from Kamuinupuri, the lower flanks of which appear to the far-right.
Photo by Lee Siebert, 1977 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.