Global Volcanism Program | Image GVP-08556
Most of the 3.5-km-wide caldera floor of Black Peak volcano, located NW of Chignik Bay, contains the complex of lava domes seen here. The ice-free mid-Holocene caldera contains two small lakes. More than 10 km3 of pyroclastic flow and block-and-ash-flow deposits from the caldera-forming eruption filled the Ash Creek and Bluff Creek valleys to the west and north less than about 4,000 years ago.
Photo courtesy of Alaska Volcano Observatory, U.S. Geological Survey, 1979.