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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

WEEKLY UPDATE

Friday, October 29 2004 12:50 PM ADT (20:50 UTC)



MOUNT SPURR VOLCANO (CAVW#1103-04)

6118' N 15215' 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 Mt. Spurr volcano.

This week, an earthquake swarm occurred on Tuesday, Oct. 26. About 3

earthquakes per hour were recorded. Since then, the level of seismicity has

declined to about 1-2 earthquakes per hour. No activity was observed in

satellite or web camera data, although clouds obscured the volcano for much

of the week. The Spurr web camera can be viewed at

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



Mt. 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 Mt. Spurr. These eruptions were explosive, brief in

duration, and produced towering columns of ash that rose up to 20 km

(65,000 ft) above sea level and deposited several mm of ash on populated

areas of south-central Alaska, including approximately 6 mm of ash on

Anchorage in 1953. The summit of Mt. Spurr and the surrounding avalanche

caldera is heavily mantled by ice and snow. The last known eruption from

the summit dome of Mt. Spurr was more than 5,000 years ago. The primary

hazards associated with future eruptions from the Mt. Spurr summit vent and

from Crater Peak 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@giseis.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
Contact Information: AVO Web Team

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