Cleveland Activity - Color Code YELLOW : Alert Level ADVISORY
Posted by JAC on 7/23/2011, 8:41 am
http://www.avo.alaska.edu/activity/Cleveland.php

CLEVELAND VOLCANO (CAVW #1101-24-)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

On Wednesday, July 20,2011 AVO raised the aviation color code/volcano alert level for Cleveland volcano to Yellow/Advisory following the detection of persistent thermal anomalies in satellite data. A thermal anomaly was detected in satellite images this morning. No other activity has been observed at the volcano.

Without a real-time seismic network at Cleveland, AVO is unable to track local earthquake activity related to volcanic unrest. Short-lived explosions with ash clouds that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery for hours. Low-level ash emissions at Cleveland occur frequently and do not necessarily mean a larger eruption is imminent. AVO continues to monitor the volcano using satellite imagery.

Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and it produced 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. The 2001 eruption also produced a rubbly lava flow and hot avalanche that reached the sea. The most recent minor ash emission was in September 2010.
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Cleveland volcano poised to erupt - and it's directly under the major U.S. flight path, Alaska - JAC, 7/23/2011, 8:37 am
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