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AVO VOLCANO ACTIVITY NOTIFICATION

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Wednesday, May 22, 2013, 12:20 PM AKDT (Wednesday, May 22, 2013, 20:20 UTC)


PAVLOF VOLCANO (VNUM #312030)
55°25'2" N 161°53'37" W, Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

The eruption of Pavlof continues. Seismic tremor declined markedly yesterday around 11:00 AM AKDT and has been replaced by small discrete events likely indicative of small explosions. These explosion signals were also recorded on pressure sensors. A meteorological cloud deck has moved in over the volcano with a top of approximately 15,000 feet (4.5 km) above sea level thus obscuring satellite observations. If a volcanic ash plume is being generated, it is below this cloud deck. The last observations of the volcanic ash plume were on Monday afternoon. Trace ash fall with rain on Nelson Lagoon, 48 miles (80 km) NE of Pavlof, was reported yesterday morning. Elevated surface temperatures at the vent were observed in satellite images, even through cloud cover over the past 24 hours, indicative of continued activity.

Although the activity to date has been characterized by relatively low-energy lava fountaining and ash emission, more energetic explosions could occur without warning that could place ash clouds above 20,000 ft. Information about mitigating the effects of volcanic ash can be found on the AVO web page. Depending on wind direction and strength, trace to minor ash fall may occur on local communities downwind.


CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Clouds obscured views of Cleveland by satellite over the past 24 hours. AVO has received no reports of ash emission or other indications of eruptive activity over the past 24 hours.

Sudden explosions of blocks and ash are possible with little or no warning. Ash clouds, if produced, could exceed 20,000 feet above sea level. If a large ash-producing event occurs, nearby seismic, infrasound, or volcanic lightning networks should alert AVO staff quickly. However, for some events, a delay of several hours is possible. Cleveland Volcano does not have a local seismic network and is monitored using only distant seismic and infrasound instruments and satellite data.








VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu
RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478

CONTACT INFORMATION:

John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 378-7556

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.
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