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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

STATUS REPORT

Friday, November 4, 2005 3:45 PM AKST (045 UTC)




SPURR VOLCANO (CAVW#1103-04-)

61.2994°N 152.2511°W, Summit Elevation 11070 ft (3374 m)

Current Level of Concern Color Code: YELLOW



The level of seismic activity at Mount Spurr volcano remains above background. Steaming was observed in clear webcam views much of the week. In response to a vigorous summit steam plume on Wednesday, AVO scientists conducted an observation overflight Thursday morning. The crater lake level and actively steaming areas in and around the crater were unchanged from previous observations from October 9. We expect steaming to continue. Clear to partly cloudy webcam and satellite views have shown no other unusual activity. There are no indications that an eruption is imminent.



CLEVELAND VOLCANO (CAVW#1101-24-)

52.8232°N 169.9431°W, Summit Elevation 5676 ft (1730 m)

Current Level of Concern Color Code: YELLOW



Mostly clear satellite views last night showed a return of thermal anomalies at the summit of Cleveland volcano. No ash has been detected since a brief ash burst that rose no higher than 4,600 m (15,000 ft) ASL on October 7. No reports of activity have been received from pilots or ground-based observers. Based on the past eruptive activity at Cleveland, occasional ash emissions may occur with little warning. Cleveland is not monitored with seismic instruments and our only means of ash detection at this time is satellite observation or eyewitness observations.



TANAGA VOLCANO (CAVW#1101-08-)

51.885°N 178.1458°W, Summit Elevation 5925 ft (1806 m)

Current Level of Concern Color Code: YELLOW



Elevated seismic activity below young volcanic vents on Tanaga Island continues. Extended periods of low-level volcanic tremor were detected at stations closest to Takawangha volcano, the easternmost vent of the Tanaga volcano cluster. Partly cloudy satellite views of the volcano showed nothing unusual.



VENIAMINOF VOLCANO (CAVW#1102-07-)

56.1956°N 159.3883°W, Summit Elevation 8225 ft (2507 m)

Current Level of Concern Color Code: YELLOW



A low-level, minor ash emission was observed coming from the intracaldera cone of Mount Veniaminof this morning in AVO webcam images from Perryville. Since the activity is above normal background, the color code for Mount Veniaminof was upgraded to YELLOW today in an earlier Information Release.



The ash emission started at about 9:29 AM AST (1829 UTC) this morning. The discrete ash emission was small, rising a few hundred meters (several hundred feet) above the cone, which has an elevation of 2,156 m (7,073 ft) above sea level, and dissipated rapidly as it drifted towards the east. Ash fall is likely very minor, and confined to the summit caldera. Occasional steaming from the intracaldera cone has also been observed during the past two weeks.



Very weak seismic tremor and a few small discrete seismic events have been seen at the station closest to the active cone. However, there are no indications from seismic data that a significantly larger eruption is imminent. We expect that steam and ash emissions may continue intermittently and could pose a hazard to people and low-flying aircraft in the vicinity of the active cone.



KATMAI VOLCANO (CAVW#1102-17-)

58.2797°N 154.9633°W, Summit Elevation 6716 ft (2047 m)

Current Level of Concern Color Code: GREEN



Strong winds in the Katmai area picked up loose 1912 volcanic ash and carried it east over Kodiak Island Thursday evening. AVO detected in satellite data a large area of resuspended ash blowing from the vicinity of Katmai and the Valley of Ten Thousand Smokes to Kodiak Island. The National Weather Service estimated the top of the plume at 1,525m (5,000 ft).



This phenomenon is not the result of volcanic activity and has occurred before in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. Resuspended volcanic ash should be considered as hazardous as primary volcanic ash and could be damaging to aircraft. All of the volcanoes of the Katmai area (Snowy, Griggs, Katmai, Novarupta, Trident, Mageik, Martin) remain at color code GREEN.



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].

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Page modified: May 27, 2014 10:23
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