Nature
Mount Kupreanof is an active stratovolcano on the Alaska Peninsula and the largest, northeasternmost of five volcanoes opposite Stepovak Bay. It is especially notable for extremely strong fumarole activity, indicating persistent heat and gas release. The volcano’s most recent reported eruption came in 1987, producing minor steam and ash emissions, though some accounts have questioned that event and no other historical eruption is known. It remains under observation, and in May 2026 the Alaska Volcano Observatory raised its status to Advisory with an Aviation Color Code of Yellow after months of elevated seismicity and volcanic gas emissions.
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Ivanof Bay, Alaska · United States