Natural Features & Ecosystems
Aniakchak Caldera is a raw and rugged volcanic feature located in a landscape that is, because of its remoteness, little affected by human occupancy. Plant and animal communities are in tune with the natural phenomena that control their habitat. Volcanic activity has subsided since the last eruption in 1931, but the geologic processes that follow such activity continue to weather, erode, and redistribute the volcanic materials. Hot spots and warm springs on the caldera floor indicate that eruptive activity may resume at any time.
Download maps and the report from the 2015 Geologic Resources Inventory of Aniakchak National Monument and Preserve.
Last updated: April 25, 2018