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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

WEEKLY UPDATE

Friday, January 7, 2005 12:30 PM AST (21:30 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: YELLOW



The Level of Concern Color Code for Mount Veniaminof Volcano was upgraded

from GREEN to YELLOW on Tuesday, January 4. Small steam and ash emissions,

several approaching 3600 m (12,000 ft) above sea level, continue to be seen

in web camera images. A weak thermal anomaly was detected in AVHRR

satellite data collected at 6:46PM AST (0346 UTC) but not in any subsequent

images. Perryville residents observed incandescence at the active crater

Thursday night sometime between 8:00 PM and 9:00 PM AST (0500 and 0600

UTC). Low-level strombolian activity that ejects blocks of hot rock and

lava could occur with little warning. Activity would be confined to the

caldera.



Weak seismic tremor was observed starting on January 1 and has increased

during the past week. Amplitude and occurrence rate of volcanic tremor and

discrete volcanic earthquakes have increased again in the past 24 hours to

a level last observed during May-June 2004. We expect that steam and ash

emissions will continue intermittently and could pose a hazard to people

and low-flying aircraft in the vicinity of the active cone.





AVO is increasing its surveillance of Mount Veniaminof, but the volcano

remains at color code YELLOW.



Real-time pictures of Mount Veniaminof are available on the internet at:



http://www.avo.alaska.edu/avo4/atlas/volc/venia/veni2004/index.htm



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.





MOUNT SPURR VOLCANO (CAVW#1103-04)

61°18' N 152°15' W, Summit Elevation 11,070 ft (3,374 m)

Current Level of Concern Color Code: YELLOW



Elevated levels of seismicity continue to be recorded at Mount Spurr.

Seismicity rates average 7 located earthquakes per. No activity was

observed in satellite and web camera images this week. Real-time pictures

of Mount Spurr are available on the internet at:



http://www.avo.alaska.edu/avo4/atlas/volc/spurr/spurr2004/index.html



Mount Spurr volcano is an ice- and snow-covered stratovolcano located on

the west side of Cook Inlet. The only known historical eruptions occurred

in 1953 and 1992 from the Crater Peak flank vent located 3.5 km (2 mi)

south of the summit of Mount Spurr. These eruptions were brief, explosive,

and produced columns of ash that rose up to 20 km (65,000 ft) above sea

level and deposited several mm of ash in south-central Alaska, including

approximately 6 mm of ash on Anchorage in 1953. The last known eruption

from the summit of Mount Spurr was more than 5,000 years ago. Primary

hazards during future eruptions include far-traveled ash clouds, ash fall,

pyroclastic flows, and lahars or mudflows that could inundate drainages all

sides of the volcano, but primarily on the south and east flanks.





OTHER ALASKA VOLCANOES

Seismic activity is monitored in real time at 27 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, Redoubt, Iliamna, Augustine, Snowy,

Griggs, Katmai, Novarupta, Trident, Mageik, Martin, Aniakchak, Veniaminof,

Pavlof, Dutton, Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin,

Okmok, Great Sitkin, Kanaga, Tanaga, and Gareloi 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].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
Contact Information: AVO Web Team

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