Nature
Mount Iliamna is a glacier-covered stratovolcano in southwest Alaska, rising 10,016 feet in the Chigmit Mountains within Lake Clark National Park and Preserve. Ice has heavily reshaped the mountain into steep cliffs and cirques, leaving no summit crater but a fumarolic zone above a large collapse area at the head of Red Glacier. Its eruptive history is only partly understood, with prehistoric eruptions identified by radiocarbon dating, observed eruptions in 1867 and 1876, and later periods of unrest marked by seismicity, gas emissions, and persistent steam plumes often mistaken for eruptions. Because of its activity and aviation risk, it is ranked among the nation’s high-threat volcanoes.
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Pedro Bay, Alaska · United States
