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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
Thursday, May 23, 2013 10:39 AM AKDT (Thursday, May 23, 2013 18:39 UTC)


PAVLOF VOLCANO (CAVW #1102-03-)
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 at low levels today. Small discrete events, likely indicative of small explosions continue to be detected on seismic and pressure sensor networks over the past 24 hours. Seismic tremor declined markedly on Tuesday morning and has not resumed. Cloudy conditions obscured satellite observations of the volcano over the past 24 hours but a pilot report and photos from yesterday afternoon showed a very weak steam and gas plume with little to no ash issuing from the vent. Elevated surface temperatures were observed in satellite images, even through cloud cover, 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. Depending on wind direction and strength, trace to minor ash fall may occur on local communities downwind. Information about mitigating the effects of volcanic ash can be found on the AVO web page.

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

Elevated surface temperatures were observed by satellite over the past 24 hours indicative of ongoing low-level activity. 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.