Westdahl Peak, also known as Westdahl Volcano or Mount Westdahl, is a stratovolcano of the

Aleutian Range The Aleutian Range is a major mountain range located in southwest Alaska. It extends from Chakachamna Lake (80 miles/130 km southwest of Anchorage) to Unimak Island, which is at the tip of the Alaska Peninsula. It includes all of the mountain ...

, in the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sove ...

Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S. ...

. The volcano last erupted from November 29, 1991 to January 15, 1992.Alaska Volcano Observatory, Volcano Information -- Historic eruptions at Westdahl
Retrieved Dec. 16, 2022. It is on

Unimak Island Unimak Island ( ale, Unimax, russian: Унимак) is the largest island in the Aleutian Islands chain of the U.S. state of Alaska. Geography It is the easternmost island in the Aleutians and, with an area of , the ninth largest island in the ...

, near the western tip of the Alaska Peninsula. The volcano has a second summit, called Faris Peak, which is actually the highest point at 5,426 feet (1,654 m).Alaska Volcano Observatory, Volcano Information -- Faris Peak
Retrieved Dec. 16, 2022. Westdahl Peak currently has a summit elevation of 5,118 feet (1,560 m). Other historical eruptions, all attributed to Westdahl by the

Alaska Volcano Observatory The Alaska Volcano Observatory (AVO) is a joint program of the United States Geological Survey, the Geophysical Institute of the University of Alaska Fairbanks, and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS). AVO ...

, have been reported in 1795-1796, 1827-1829, 1951, 1964 and 1978. A couple eruptions were originally reported to be from nearby

Pogromni Volcano Pogromni Volcano is a stratovolcano on Unimak Island in the Aleutian Islands. Near it are 5 cinder cones, and a mountain called Pogromni's Sister. Pogromni is old and eroded with a single glacier on its flank and base. Eruptions have been attri ...

, but the peak is old, eroded and most likely hasn't erupted since

Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in ...

time.Alaska Volcano Observatory, Volcano Information -- Reported Activity at Westdahl
Retrieved Dec. 16, 2022.

References

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Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs

Alaska Volcano Observatory
Mountains of Alaska Aleutian Range Westdahl Westdahl Volcano Mountains of Aleutians East Borough, Alaska Stratovolcanoes of the United States Active volcanoes Volcanoes of Alaska Holocene stratovolcanoes {{AleutiansEastAK-geo-stub

See also

References