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COOK INLET VOLCANOES
Seismic activity at Spurr, Augustine, Redoubt and Iliamna
volcanoes remains at normal levels.
Pilots reported a spectacular steam plume rising to about 5,000 feet above the volcano on Tuesday afternoon. Shishaldin is the highest peak in the Aleutian Islands (2857 m), and one (of) the most active volcanoes in the Aleutian arc. Located near the center of Unimak Island, the symmetrical cone has a small summit crater that emits a steady cloud of steam. The last eruption of Shishaldin occurred March 1986-February 1987 and was characterized by minor steam and ash emission. Major explosive eruptions occurred in 1830 and 1932. Steam plumes such as that observed on Tuesday, although quite large in comparison to typical day-to-day emissions, are not considered unusual for Shishaldin.
The Alaska Volcano Observatory continues to seismically
monitor Spurr, Augustine, Redoubt and Iliamna volcanoes.
We maintain a computerized alarm system that is capable of
notifying AVO seismologists during nonbusiness hours,
should unusual seismic activity occur.