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Kasatochi volcano, United States
An eruption plume rises above the summit of Karkar volcano in 1979.
A dramatic 750-m-wide crater filled with a salt-water lake truncates the summit of Kasatochi volcano.
Steep-sided crater walls rise to a maximum elevation of 314 m above the lake surface, which is less than 60 m above sea level.
The volcano is located at the northern end of a shallow submarine ridge trending perpendicular to the Aleutian arc and occupies a small 2.7 x 3.3 km wide island volcano.
Reports of activity from the heavily eroded Koniuji volcano to the east probably refer to eruptions from Kasatochi.
Located at the northern end of a shallow submarine ridge trending perpendicular to the Aleutian arc, Kasatochi is small 2.7 x 3.3 km wide island volcano with a dramatic 750-m-wide summit crater lake.
The summit of Kasatochi reaches only 314 m above sea level, and the lake surface lies less than about 60 m above the sea.
A lava dome is located on the NW flank at about 150 m elevation.
The asymmetrical island is steeper on the northern side than the southern, and the volcano's crater lies north of the center of the island. Reports of activity from the heavily eroded Koniuji volcano to the east probably refer to eruptions from Kasatochi.
A lava flow may have been emplaced during the first historical eruption in 1760.
A major explosive eruption in 2008 produced pyroclastic flows and surges that swept into the sea, extending the island's shoreline.
PHOTO SOURCE: Photo by Dan Rogers, 1961 (courtesy of Alaska Volcano Observatory, U.S. Geological Survey).
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