The Alaska Volcano Observatory has raised the alert level for the active Cleveland Volcano in the east central Aleutian Islands.
In recent years the Cleveland Volcano has been the most active volcano in Alaska with a handful of small eruptions. On Wednesday afternoon AVO raised the volcano alert level to advisory and the aviation color code was increased to yellow.
The Cleveland Volcano forms the western half of an uninhabited island in the east central Aleutians. There have been several minor eruptions in recent years and the most significant recent eruption began in February of 2001. That eruption included 3 explosive events that produced ash clouds as high as 39-feet above sea level. That was high enough to disrupt international air travel over the region. The Alaska Volcano Observatory does not currently have a seismic monitoring network on the Cleveland Volcano but there are tools available to track the activity at the volcano including satellite images, seismic stations at other locations in the Aleutian Islands, and even an infrasound array just north of Dillingham. Details about the activity at the Cleveland Volcano and all of the other volcano's in Alaska can be found on the website of the Alaska Volcano Observatory at www.avo.alaska.edu.