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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

Friday, April 7, 2006 10:10 AM AKDT (1810 UTC)




AUGUSTINE VOLCANO (CAVW#1103-01-)

59°21'48"N 153°26'W , Summit Elevation 4134 ft (1260 m)

Current Level of Concern Color Code: ORANGE



Low-level eruptive activity continues at Augustine Volcano, though at diminished levels compared to previous weeks. Occasional hot block-and-ash flows, rock avalanches, and rock falls originating from the summit lava dome and lava flows continue to be recorded by the seismic network. Small and dilute ash clouds resulting from these processes are likely confined to the immediate vicinity of the volcano. During very high wind conditions, minor amounts of ash may be carried longer distances.



Satellite imagery of the volcano this week indicated a continuing thermal anomaly at Augustine's summit. Airborne sulfur dioxide gas measurements this week show continued emissions of magmatic gas. Low-light camera observations, which are becoming increasingly difficuly to make because of lengthening days, show that activity this week was restricted mainly to the summit dome.



Dome-building eruptive activity will likely continue, perhaps intermittently, over the next several weeks or months. Brief, energetic explosions of ash can occur with little or no warning. Such explosions could produce significant amounts of ash and drifting ash clouds that could rise more than 25,000 feet above sea level.



AVO is monitoring Augustine closely and the observatory remains staffed 24/7. For up-to-date Ashfall Advisories and wind trajectories, please refer to the National Weather Service website: http://pafc.arh.noaa.gov/augustine.php



VENIAMINOF VOLCANO (CAVW#1102-07-)

56°11'44"N 159°23'18"W , Summit Elevation 8225 ft (2507 m)

Current Level of Concern Color Code: YELLOW



Clear web camera views this week have shown low altitude ash emissions. On April 6, a pilot reported an ash plume rising to 10,000 ft ASL. The sesimic network, which had been out since March 21, was repaired on April 5. Seismicity remains at low levels. Production of short-lived, very small-volume steam and ash bursts from the intracaldera cone has been typical of this volcano intermittently over the past few years. There are no indications that a larger eruption is imminent. Ash clouds and fallout from these events are not likely to extend beyond the caldera rim, but could pose a hazard to people and low-flying aircraft in the vicinity of the active cone.



ABBREVIATED COLOR CODE KEY (contact AVO for complete description):

GREEN volcano is dormant; normal seismicity and fumarolic activity occurring

YELLOW volcano is restless; eruption may occur

ORANGE volcano is in eruption or eruption may occur at any time

RED significant eruption is occurring or explosive eruption expected at any time



VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu

RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478



CONTACT INFORMATION:

Tom Murray, Scientist-in-Charge, USGS

tlmurray@usgs.gov (907) 786-7497



Steve McNutt, Acting Coordinating Scientist, UAF-GI

steve@giseis.alaska.edu (907) 474-7131



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.
VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.

AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].

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Page modified: May 27, 2014 10:23
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