Mount Kupreanof
United States · Americas
About
Mount Kupreanof is a stratovolcano on the Alaska Peninsula, United States. It is the largest and the northeasternmost in a group of five volcanoes opposite from Stepovak Bay. Mount Kupreanof displays extremely strong fumarole activity and its latest eruption in 1987 produced minor steam and ash emission. This is the only known historical eruption from Mount Kupreanof, although the event is considered questionable according to sources.
The Alaska Volcano Observatory is currently monitoring recent activity at Mount Kupreanof due to elevated seismicity and volcanic gas emissions over the past few months, raising the Volcano Alert Level to "Advisory" and the Aviation Color Code to "Yellow" on May 12, 2026.
Adapted from Wikipedia (CC BY-SA)。Photography via Wikimedia Commons.