Mount Westdahl, Unimak Island

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Mount Westdahl, Unimak Island

by | Mar 20, 2019

Mount Westdahl is a volcano with an elevation of 5,118 feet (1,560 m), located at the southwest end of Unimak Island, in the eastern Aleutian Islands, Alaska. The volcano was named in 1902 for Ferdinand Westdahl, of the U.S. Coast and Geodetic Survey, who determined its geographic position in 1901.

Westdahl is an ancient stratovolcano with four active volcanic summits including Westdahl Peak, Faris Peak, Pogromni Volcano, and Pogromni’s Sister. The base has a diameter of 11 miles (18 km) and may represent the surface of a truncated ancestral cone. The size of the cone makes this one of the largest volcanoes in the Aleutian Islands. The northeast-facing slopes are steeper, and the entire ancestral cone has been extensively dissected by erosion.

Pogromni Volcano is old and eroded with a single glacier on its flank and base. There are five nearby cinder cones, and a second active summit called Pogromni’s Sister. Pogromni erupted in 1795, 1796, 1826, 1827, and 1830, but because of persistent cloud cover, some historic eruptions attributed to it may have come from nearby Westdahl Peak. The most recent eruption of Westdahl Peak was in 1992. Pogromni’s name comes from the Russian Погромный, meaning “characterised by violent outbreak”. This naming refers to a volcanic eruption but shares the same etymology as pogrom, a Russian word referring to violent riots against an ethnic group. Read more here and here. Explore more of Westdahl here:

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