View onto the floor of the caldera from the southeast rim of Aniakchak caldera. Two explosion craters (maar craters) partially filled with seasonal meltwater are visible. The craters were formed by explosions through older lava flows from Vent Mountain, an intracaldera stratocone. Photograph by R. McGimsey, U.S. Geological Survey, June 29, 1992.
Image courtesy of AVO / U.S. Geological Survey.