ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey
Friday, May 11, 2012, 11:00 AM AKDT (Friday, May 11, 2012, 19:00 UTC)
60°1'55" N 153°5'30" W,
Summit Elevation 10016 ft (3053 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Seismic activity at Iliamna Volcano remains slightly above background, and the rate of seismic activity has declined over recent weeks. Nothing unusual was observed in web camera and cloudy satellite images over the past 24 hours.
The current activity at Iliamna does not indicate an imminent or certain eruption. A similar seismic swarm at Iliamna in 1996-1997 was not followed by eruptive activity. Prior to an eruption, AVO would expect to see a further increase in earthquake activity.
52°49'20" N 169°56'42" W,
Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
The low-level eruption of Cleveland Volcano continues. A small lava dome that was observed at the summit in early May has been destroyed. It is possible that the lava feature was destroyed during explosive activity that was detected from Cleveland Volcano on distant seismic and infrasound networks on May 4 and 5. There is no sign of new lava extrusion at the summit at this time. Weather conditions have been cloudy near the volcano preventing clear views in satellite data. No ash has been detected or reported.
While the volcano is active, sudden explosions of blocks and ash remain likely. Associated ash clouds could exceed 20,000 feet above sea level. If a large ash-producing event occurs, seismic, infrasound, or volcanic lightning networks should detect the event and alert AVO staff. There is no real-time seismic monitoring network on Mount Cleveland so AVO is unable to track activity in real time.
VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu
RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478
John Power, Scientist-in-Charge, USGS
email@example.com (907) 786-7497
Jeff Freymueller, Acting Coordinating Scientist, UAF
firstname.lastname@example.org (907) 474-7286
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.