Global Volcanism Program | Image GVP-02066
The peninsula across the center of the photo is the SW rim of Nakanoumi caldera. The 3-km-wide caldera formed about 5,400 years ago during the largest Towada Holocene eruption . The eruption was followed by the collapse of the Goshikiiwa cone at the southern end of the caldera. Clouds obscure the western caldera rim in the background.
Photo by Lee Siebert, 1977 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.