Mount Okmok

From Wikipedia, the free encyclopedia

Mount Okmok (Okmok Caldera)
Aerial view looking north of Okmok Caldera.
Elevation	3,519 ft (1,073 m)
Location	Umnak Island, Aleutian Islands, Alaska
Coordinates	53°28′05″N, 168°10′30″W
Topo map	USGS Umnak B-1
Type	Shield volcano
Last eruption	1997

Mount Okmok is the highest point on the rim of Okmok Caldera (Unmagim Anatuu^[1] in Aleut) on the northeastern part of Umnak Island in the eastern Aleutian Islands of Alaska. This 5.8 miles (9.3 km) wide circular caldera truncates the top of a large shield volcano. A large crater lake once filled much of the caldera to a depth of over 500 feet (150 m), but the lake ultimately drained out through a notch eroded into the northeast rim. Only a small remnant lake about 1,000 ft (300 m) across now exists in a depression in the western part of the largely flat caldera floor.

Map showing volcanoes of Alaska. The mark is set at the location of Mount Okmok.

[edit] Sources

• Smithsonian Institution Global Volcanism Program: Okmok
• Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs
• Alaska Volcano Observatory

[edit] References

This Alaska location article is a stub. You can help Wikipedia by expanding it.