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.
Did You Know?
Warm, thermally-influenced springs drain into the western shores of Surprise Lake in Aniakchak National Monument & Preserve. Rich in iron sediments, these waters lend a splash of vibrant color to the volcanic landscape.