Nature
Mount Chiginagak is an active stratovolcano on the Alaska Peninsula in a remote landscape shaped by ice, lava, and hydrothermal activity. Its most recent known eruptive products include an unglaciated lava flow and a pyroclastic-flow deposit extending east from the summit, likely sourced from a lava dome on the southeast flank. Reported ash eruptions in 1971 and 1998 confirm continued activity. The volcano also has fumaroles and hot-spring travertine deposits. A major recent event occurred in 2005, when an acidified summit crater lake drained catastrophically, sending acidic water down local creeks into Mother Goose Lake, damaging vegetation, killing aquatic life, and blocking the annual salmon run.
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Ugashik, Alaska · United States
