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AVO VOLCANO ACTIVITY NOTIFICATION

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Monday, May 20, 2013, 2:15 PM AKDT (Monday, May 20, 2013, 22:15 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

Seismic tremor, intense elevated surface temperatures, and ash, gas and steam emissions continue at Pavlof Volcano.

Winds shifted from SE to NNE yesterday around 1:00 AKDT. The last clear satellite image on May 19, 2:00 AKDT shows a low-level ash plume extending NNE about 37 miles (60 km) from Pavlof. The plume has since been obscured in satellite views due to cloudy conditions. Pilot reports from yesterday afternoon also indicate that ash emission continues and ash clouds are rising to 15,000 to 22,000 feet (4.5 to 7 km) above sea level. Trace amounts of ash were reported to have fallen on the community of Nelson Lagoon, 48 miles (78 km) NNE of Pavlof during the late evening of May 19 and continuing this morning. Rainfall in Nelson Lagoon this morning is likely contributing to ash fall out.

Seismic activity remains elevated with nearly continuous volcanic tremor being recorded on the local seismic network. 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, trace to minor amounts of ash may fall on nearby communities, including Sand Point, Nelson Lagoon, King Cove and Cold Bay. Information about mitigating the effects of volcanic ash can be found on the AVO web page.


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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Page modified: December 2, 2016 10:12
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