North half of the caldera as seen from the west. Perret Ridge (l) and Ragged Top (r). An old lava flow from Mt Cerberus can be seen flowing down toward Fenner Lake on the left side of the image. Photos of Semisopochnoi Island taken in May 2017 during AVO station maintenance activities and supported by U.S. Coast Guard.
Image courtesy of AVO/USGS.