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ALASKA VOLCANO OBSERVATORY
Friday, November 12, 2004 12:30 PM AST (21:30 UTC)
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. 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:
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
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
VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu
RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478
Tom Murray, Scientist-in-Charge, USGS
firstname.lastname@example.org (907) 786-7497
Scott Stihler, Acting-Coordinating Scientist, UAF-GI
email@example.com; (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