Printer friendly versionALASKA VOLCANO OBSERVATORY WEEKLY UPDATEFriday, September 9, 2011 2:16 PM AKDT (Friday, September 9, 2011 22:16 UTC)CLEVELAND VOLCANO
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
On September 6, AVO raised the Aviation Color Code at Cleveland to ORANGE
and the Alert Level to WATCH, as a persistent thermal anomaly observed in satellite data September 3-6 indicated slow effusion of lava in the summit crater had resumed. A thermal anomaly has also been spotted over the past 24 hours, suggesting that lava-dome growth is continuing.
A growing lava dome in the crater increases the possibility of an explosive eruption, but does not necessarily indicate that one will occur. Short-lived explosions could produce ash clouds that exceed 20,000 ft above sea level. These events can occur without warning and may go undetected in satellite imagery for hours.
Without a real-time seismic network on the volcano, AVO is unable to track local earthquake activity related to volcanic unrest, provide forecasts of eruptive activity, or confirmation of explosive, ash-producing events. AVO will continue to monitor the volcano using satellite data as it becomes available.
Chris Waythomas, Acting Scientist-in-Charge, USGS
firstname.lastname@example.org (907) 786-7497
Steve McNutt, Coordinating Scientist, UAF
email@example.com (907) 474-7131
The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.