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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

WEEKLY UPDATE

Friday, November 12, 2004 12:30 PM AST (21:30 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 Mount Spurr. A

period of slightly increased seismicity occurred between November 6 to 8

when as many as 3 shallow earthquakes per hour were recorded. Since then,

the level of seismicity has declined to an average of six earthquakes per

day. No unusual activity was observed in satellite or web camera images.

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



Scott Stihler, Acting-Coordinating Scientist, UAF-GI

scott@giseis.alaska.edu; (907) 474-5450



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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