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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

WEEKLY UPDATE

Friday, January 14, 2005 1:00 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: ORANGE



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

from YELLOW to ORANGE on Monday, January 10. At that time, web camera views

showed that small ash emissions from the intracaldera cone of Mount

Veniaminof, some reaching nearly 13,000 ft (3692 m) above sea level, had

occurred more or less continuously over the previous 48 hours. Since then,

activity appears to have declined significantly, though web camera views

have often been obscured by clouds.



Beginning on Saturday, January 8, satellite images showed a heat anomaly in

the vicinity of Veniaminof’s summit. The most recent satellite image,

taken today, shows that the heat anomaly persists, though the intensity may

be less than earlier in the week.



Very weak volcanic tremor was observed starting on January 1, 2005. Over

the next week, the magnitude of the volcanic tremor increased significantly

and there have been frequent small volcanic earthquakes. As of this

writing, seismic activity appears to have peaked on Sunday or Monday,

though activity still remains significantly higher than normal with

occasional bursts of volcanic tremor. The maximum amplitude of the

seismicity so far has slightly exceeded that observed during the previous

phase on unrest, which ended in September 2004.



On overflight of the volcano on Tuesday January 11, showed no evidence of

lava flows, large ballistics from the cone, or substantial glacial melting.



Low-level strombolian activity that ejects blocks of hot rock and lava

could occur with little or no warning, though the ejecta would stay within

the summit caldera. We expect that steam and ash emissions may continue and

could pose a hazard to people and low-flying aircraft in the vicinity of

the active cone. Light ash falls outside of the summit caldera are

possible.



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, 2004, 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 6 located earthquakes per day. No activity was

observed in satellite and web camera images this week.



An overflight of Mount Spurr on Wednesday, January 12 showed that the

summit melt hole remains and that substantial areas of bare rock are still

to be found. These observations indicate continuing higher-than-normal

heat flow from the volcano.



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, 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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