Before revision: Shishaldin Volcano on Unimak Island in the Fox Islands group Snowy Mountain in the Aleutian Range within Katmai National Park and Preserve Takawangha Volcano on Tanaga Island in the Andreanof Islands group Tanaga Volcano on Tanaga Island in the Andreanof Islands group Trident Volcano in the Aleutian Range within Katmai National Park and Preserve Ugashik Caldera on the Alaska Peninsula near Becharof Lake Ukinrek Maars on the Alaska Peninsula near Becharof Lake Westdahl Volcano on Unimak Island in the Fox Islands group (includes Faris and Westdahl peaks) The following list shows select volcanoes monitored by AVO but currently do not have activity detection instruments and generally rely on satellite and local observations.
After revision: Shishaldin Volcano on Unimak Island in the Fox Islands group Snowy Mountain in the Aleutian Range within Katmai National Park and Preserve Takawangha Volcano on Tanaga Island in the Andreanof Islands group Tanaga Volcano on Tanaga Island in the Andreanof Islands group Trident Volcano in the Aleutian Range within Katmai National Park and Preserve Ugashik Caldera on the Alaska Peninsula near Becharof Lake Ukinrek maars on the Alaska Peninsula near Becharof Lake Westdahl Volcano on Unimak Island in the Fox Islands group (includes Faris and Westdahl peaks) The following list shows select volcanoes monitored by AVO but currently do not have activity detection instruments and generally rely on satellite and local observations.