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Mount Okmok is the highest point on the rim of Okmok Caldera (Unmagim Anatuu in Aleut) on the northeastern part of Umnak Islandmarker in the eastern Aleutian Islandsmarker of Alaskamarker, USAmarker. This 5.8 mile (9.3 km) wide circular caldera truncates the top of a large shield volcano. A crater lake once filled much of the caldera to a depth of over , but the lake ultimately drained through a notch eroded in the northeast rim. Only a small remnant lake about across exists in a depression in the western area of the largely flat caldera floor.

The last major eruptions of Okmok—with an estimated VEI strength of 6—occurred 8,300 and 2,400 years Before Present.

Following the formation of the caldera, numerous satellite cones and lava domes have formed on the flanks of the volcano. They include Mount Tulik ( ), Mount Idak ( ), and Jag Peak.

The volcano is currently rated by the Alaska Volcano Observatory as Aviation Alert Level Green and Volcanic-alert Level Normal.

July 2008 eruption

Map showing volcanoes of Alaska.
The mark is set at the location of Mount Okmok.
On Saturday, July 12, 2008, Okmok Caldera exploded without warning, sending a plume of ash over into the air. No lava flow had been reported, though the volcano issued flows in the past. Mt. Okmok is roughly southwest of Anchoragemarker and from the airport at Dutch Harbormarker. The volcano last erupted in 1997 and produced a lava flow. It erupted with no initial warnings. Residents of Fort Glennmarker, a nearby ranch, fled from falling ash and volcanic rock. The United States Coast Guard carried out rescue operations.

The eruption ended on July 12, 2008. The eruption had a VEI of 4, thus giving it a rating of 'cataclysmic'.



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