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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

WEEKLY UPDATE

Friday, September 9, 2005 2:30 PM AKDT (22:30 UTC)


VENIAMINOF VOLCANO CAVW#(1102-07-)

56.2 W 159.39 N, Summit Elevation 8225 ft (2507 m)

Current Level of Concern Color Code: YELLOW




Several minor bursts of ash occurred at Veniaminof this week as reported by Perryville residents, observed on an AVO webcam, and recorded in seismic data. Ash rose to heights less than 10,000 ft. ASL and was confined to the caldera. There are no indications that more vigorous activity is imminent or even likely. We expect that steam and ash emissions similar to those observed this week may continue intermittently and could pose a hazard to people and low-flying aircraft in the vicinity of the active cone.



AVO will continue to monitor activity at Mount Veniaminof using seismic data, satellite images, internet camera data and observer reports.



Mount Veniaminof volcano is a young stratovolcano with an ice-filled 10-km (6 mi) 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 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 characterized by intermittent, low-level emissions of steam and ash, and a small lava flow onto the summit caldera ice field producing an ice pit. Previous historical eruptions have produced ash plumes that reached 6,000 m (20,000 ft) above sea level and associated ash fall within about 40 km (25 mi) of the volcano. Minor ash emissions similar to those that occurred this week were also detected in early 2005.



SPURR VOLCANO CAVW#(1103-04-)

61.3 W 152.25 N, Summit Elevation 11070 ft (3374 m)

Current Level of Concern Color Code: YELLOW




The level of seismic activity at Mt. Spurr volcano remains above background, similar to the levels of the past several weeks. Minor steaming continues from the summit melt pit and occasionally from Crater Peak. There are no indications that an eruption is imminent.



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.



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



Jon Dehn, Acting Coordinating Scientist, UAF-GI

jdehn@gi.alaska.edu; (907) 474-6499



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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