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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

Tuesday, January 4, 2005 2:00 PM AST (23:00 UTC)





MOUNT VENIAMINOF VOLCANO (CAVW #1102-07)

5610'N 15923'W, Summit Cone Elevation 7,073 ft (2,156 m)

Current Level of Concern Color Code: YELLOW

Previous Level of Concern Color Code: GREEN





Several small ash emissions have been observed coming from the intracaldera

cone of Mount Veniaminof in recent internet camera images from Perryville.

This activity is above what we consider to be normal background. Thus the

color code for Mount Veniaminof has been upgraded to YELLOW.





Ash emission were visible starting around 9:38 AST (18:38 UTC), but could

have been obscured by clouds in previous images. The discrete ash emissions

are small, rising several hundred feet above the cone which has an

elevation of 7,073 ft (2,156 m) above sea level, and dissipating as they

drift towards the east. Ash fall is likely very minor, and confined to the

summit caldera.



Very weak seismic tremor was observed starting on January 1, and has

increased slightly over the past 2 days. The character of the signal

changed to that of numerous discrete events this morning, with events

occurring about once per minute with durations of about 10-20 seconds.

These seismic signals are similar to those recorded during steam emissions

and ash emissions from April to October, 2004. However, there are no

indications from seismic data that events significantly larger than those

observed are imminent. We expect that steam and ash emissions may continue

intermittently and could pose a hazard to people and low-flying aircraft in

the vicinity of the active cone.



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 significant 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 occurred in 2002

and in recent weeks. 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.



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



Ken Dean, Acting Coordinating Scientist, UAF-GI

kdean@gi.alaska.edu (907) 474-7364



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
Contact Information: AVO Web Team

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