Mount Spurr

Mount Spurr, or K'idazq'eni in Dena'ina, is a stratovolcano in Alaska’s Aleutian Arc about 81 miles west of Anchorage and the arc’s highest volcano. It stands within a five-kilometer-wide, south-opening caldera left by the collapse of an older volcano in the late Pleistocene or early Holocene, an event that sent pyroclastic flows and a large debris avalanche across the region. A second center, Crater Peak, has produced both historical eruptions, in 1953 and 1992, sending ash over Anchorage. Ongoing unrest, including activity in 2004 and renewed concern in 2024, has kept Mount Spurr under close watch because of risks to Anchorage and trans-Pacific air traffic.

Tyonek, Alaska · United States