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Photos: Mount Cleveland, Alaska

Aerial photograph of the Mt. Cleveland lava and summit crater on August 8, 2011. Mt. Cleveland is on Chuginadak Island in Alaska's Aleutian chain.
Photo by Dave Withrow/NOAA
Annotated NOAA satellite image from 5:02 AM AST on 29 December 2011 showing a drifting ash cloud from a small eruption of Cleveland Volcano.
Photo courtesy AVO/UAF-GI
Satellite radar image from the TerraSAR-X sensor, showing the summit of Cleveland Volcano on February 10, 2012. It shows the presence of a small lava dome within the summit crater.
Image courtesy of AVO/USGS
This GeoEye IKONOS image shows a faint plume issuing from Cleveland Volcano at 2:31 PM on September 14, 2010. Red in this image highlights areas of vegetation detected by the near-infrared channel.
Photo courtesy Alaska Volcano Observatory/GeoEye
A small volcanic plume rose above remote Mount Cleveland on June 1, 2010. This false-color image was acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) aboard NASA’s Terra satellite.
Image by NASA Earth Observatory
Aerial photograph of the Mt. Cleveland lava and summit crater on August 8, 2011. Mt. Cleveland is on Chuginadak Island in Alaska's Aleutian chain.
Photo by Kym Yano/NOAA
Aerial photograph of the Mt. Cleveland lava and summit crater on August 8, 2011. Mt. Cleveland is on Chuginadak Island in Alaska's Aleutian chain.
Photo by Dave Withrow/NOAA
Worldview satellite image collected on August 9, 2011 of the summit crater of Cleveland Volcano. The irregularly shaped dark object in the center of the image is the newly erupted lava dome. It is surrounded by brightly colored mineral deposits produced by volcanic gas emissions. A thin steam cloud partially obscures the view.
Image courtesy of AVO/USGS, copyright 2011 DigitalGlobe
Ashfall on the Lady Gudny on July 21, 2008.
Photo courtesy Anne Hillman, KIAL/Unalaska Community Broadcasting
2008 aerial photograph of the Island of Four Mountains region, including Mount Cleveland.
Photo by Cyrus Read/ AVO, U.S. Geological Survey
The eruption of Cleveland Volcano on May 23, 2006, is featured in this image photographed by an Expedition 13 crewmember on the International Space Station.
Photo courtesy Image Analysis Laboratory, NASA Johnson Space Center
The island with a prominent caldera in left (west) of image is Herbert, just northeast of it is Carlisle, and Mount Cleveland lies almost directly east. The western flanks of Tana are visible in the lower right of the image. Photographed on January 1, 2001.
Photo courtesy Image Analysis Laboratory, NASA Johnson Space Center
Mount Cleveland is a 1,730-m (5,676 ft)-high stratovolcano in Alaska's Aleutian chain. Photographed on July 24, 1994.
Photo by M. Harbin/AVO, University of Alaska Fairbanks
A webcam image showing an eruption at Cleveland Volcano on June 19, 2012.
Alaska Volcano Observatory photo
Alaska Dispatch

Mount Cleveland, located on the remote Chuginadak Island about 45 miles from the Aleutian community of Nikolski, is among Alaska's most active volcanos. It has erupted at least 24 times since 1828. In 1944, Cleveland became responsible for the only human fatality directly related to volcanic activity in Alaska, when a sergeant in the 11th Air Force, stationed on the island in World War II, was likely killed by a mudslide during an eruption.

The 5,676-foot peak has experienced 11 eruptive events since 2000 alone, and its regular activity has led to several more raised alerts in the last two years.

In 2011, the alert level at Cleveland was raised to "orange" -- indicating heightened activity with the potential for eruption, including the growth of a lava dome -- three times, in August, September and December. That last alert came in the wake of Cleveland blasting out a cloud of ash to 15,000 feet on Dec. 29, observed by satellite imagery -- the primary method of observing Cleveland, since there is no real-time monitoring equipment based on the island. An eruption in 2001 launched an ash cloud 39,000 feet into the air. 

That December eruption cleared away much of a lava dome that had been steadily building throughout the year, but in Jan. 2012, the activity level was raised again when a new lava dome about 130 feet in diameter was observed building inside the volcano's crater. After other raised alert levels, Cleveland erupted again, launching ash 35,000 feet into the air on June 19, 2012.

For the most recent updates on Mount Cleveland and for aviation alerts, check the Alaska Volcano Observatory page.