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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

Friday, February 27, 2004 01:00 PM AST (22:00 UTC)



MOUNT VENIAMINOF VOLCANO (CAVW #1102-07)

56°10'N 159°23'W, Summit Cone Elevation 7,073 ft (2,156 m)

Current Level of Concern Color Code: GREEN



Several low-level steam and ash emissions from Mount Veniaminof

volcano on the Alaska Peninsula were reported last week by residents of

Perryville and passing pilots. Satellite imagery on February 22 showed

very localized deposits within the ice-filled caldera (see

http://www.avo.alaska.edu/). Satellite passes since the 22nd have not

documented additional activity and AVO has received no further observations

from Perryville. Earthquake activity beneath the volcano remains at a low

level and the thermal signature of the intracaldera cone is unchanged from

previous months. These small ash bursts are most likely the result of

minor explosions caused by the heating of ground water below the

intracaldera cone. Such activity may be quite typical for Veniaminof and

could continue to occur intermittently. By itself, this activity does not

indicate more vigorous eruptive activity is imminent or even likely.

Therefore the color code for Veniaminof remains at GREEN.



AVO will continue to monitor activity at Mount Veniaminof using data

from the seismic network and satellites in addition to visual reports.



Mount Veniaminof volcano is an andesitic stratovolcano with an

ice-filled 10-km diameter summit caldera located on the Alaska Peninsula,

775 km (480 mi) southwest of Anchorage and 35 km (22 mi) north of

Perryville. Veniaminof is one of the largest (~ 300 km3) and most active

volcanic centers in the Aleutian Arc and has erupted at least 12 times in

the past 200 years. The most recent eruption of the volcano occurred in

1993-95 and was a moderate Strombolian eruption from the main intracaldera

cone in the northwest sector of the caldera above Cone Glacier. The

eruption was characterized by intermittent low-level emissions of steam and

ash, and a small lava flow was extruded into the summit caldera ice field

producing an ice pit. Minor explosions producing small ash clouds very

similar to those reported last week occurred in 2002. Previous historical

eruptions have produced ash plumes that reached 6,000 m (20,000 ft) above

sea level and ash fallout that blanketed areas within about 40 km (25 mi)

of the volcano.



OTHER ALASKA VOLCANOES



Seismic activity is monitored in real time at 25 volcanoes in Alaska.

Satellite images of all Alaskan volcanoes are analyzed daily for evidence

of ash plumes and elevated surface temperatures. Some volcanoes may

currently display anomalous behavior but are not considered to be at a

dangerous level of unrest.



Wrangell, Spurr, Redoubt, Iliamna, Augustine, Snowy, Griggs, Katmai,

Novarupta, Trident, Mageik, Martin, Aniakchak, Veniaminof, Pavlof, Dutton,

Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin, Okmok, Great

Sitkin, and Kanaga volcanoes are in color code GREEN. All are at or near

normal levels of background seismicity. AVO did not detect ash plumes or

significant elevated surface temperatures in the vicinity of any volcano.





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



John Eichelberger, Coordinating Scientist, UAF-GI

eich@gi.alaska.edu (907) 474-5530



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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