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AVO VOLCANO ACTIVITY NOTIFICATION

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, July 4, 2013, 11:40 AM AKDT (Thursday, July 4, 2013, 19:40 UTC)


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

No evidence of eruptive activity at Pavlof over the past day. Seismic activity remains very low. Satellite observations over the past day show weakly elevated surface temperatures, which are consistent with the cooling of the previously erupted lava. No ash or gas emissions have been detected in satellite data, web camera images, or reported by pilots.

During earlier periods of the current eruption and past eruptions of Pavlof, the style of eruptive activity has fluctuated from higher to lower levels. Such a fluctuation occurred during the current eruption on May 28, when eruptive activity paused until resuming on June 4. Therefore, the current pause in eruptive activity does not necessarily indicate that the eruption has ended. Renewed activity is possible, and may not be preceded by significant seismic activity. AVO will continue to monitor Pavlof closely.


VENIAMINOF VOLCANO (VNUM #312070)
56°11'52" N 159°23'35" W, Summit Elevation 8225 ft (2507 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Nearly continuous, low-level volcanic tremor has been detected in seismic data throughout the past 24 hours. Satellite observations detected elevated surface temperatures at the intracaldera cone of Veniaminof volcano. The seismic data indicate an ongoing low-level eruption characterized by effusion of lava and emission of minor amounts of ash and steam. Web camera images of the volcano from Perryville throughout the past 24 hours have been mostly obscured by clouds.

It remains possible for activity at Veniaminof volcano to increase above its current level at any time and more vigorous ash emissions may occur. Sustained periods of volcanic tremor may correspond with episodes of continuous ash emission which may not be detected in satellite data, especially if ash plumes remain below 15,000 to 20,000 feet above sea level. Brief bursts of ash emission and small explosions may result in ash fall on the flanks of the volcano, and this is likely to occur while the volcano is at its current level of unrest. A vigorous explosive episode that produces a large ash cloud is not expected at the level of unrest that has been occurring over the past several weeks; however, this remains a possible, but not certain outcome of the present eruption. The lava flow may continue to grow slowly and is not expected to lead to any significant hydrologic events in the drainages north of the volcano associated with melting of snow and ice.


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

No elevated surface temperatures or other outward signs of unrest were observed in satellite images over the past 24 hours. AVO has received no other reports of activity at the volcano.

Sudden explosions of blocks and ash are possible with little or no warning and 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. However, for some events, detection may not be possible for several hours. 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

Janet Schaefer, Acting Coordinating Scientist,
Alaska Division of Geological and Geophysical Surveys
janet.schaefer@alaska.gov (907) 451-5005

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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