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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

WEEKLY UPDATE

Friday, May 5, 2006 2:45 PM AKDT (2245 UTC)




AUGUSTINE VOLCANO (CAVW#1103-01-)

59°21'48"N 153°26'W , Summit Elevation 4134 ft (1260 m)

Current Level of Concern Color Code: YELLOW



Seismic data show that rock fall and avalanche events are still occurring, but at a diminished rate. Partly cloudy satellite views over last weekend show that the summit temperatures are still elevated. While the webcam views have been cloudy most of the week, a few clear views of the volcano show that the vigorous steaming continues.



Data and observations currently indicate that the growth of the summit lava dome and lava flows has stopped, or continues only at a very low rate. Despite the apparent cessation of lava dome growth, the new dome and lava flows are still highly unstable, and rock falls and avalanches are still occurring and may continue for several weeks or months. The north flank of the island is the area most susceptible to rock falls and avalanches, and the steep ends of the lava flows are also places where rock fall activity may continue. These areas are considered very hazardous. Small, dilute ash clouds produced by rock falls and avalanches may still develop, but these ash clouds are unlikely to extend beyond Augustine Island.



Despite the volcano's current quiet state, renewed eruptive activity is possible. AVO expects that a renewal of explosive activity or lava extrusion would likely be preceded by increases in seismicity, gas output, and deformation.



Brief, unexpected explosions are still possible if hot gas and rocks interact with groundwater, but such explosions are unlikely to produce ash that would travel far beyond the island.



AVO continues to monitor Augustine closely and the observatory will remain staffed 24/7 until conditions at the volcano approach background levels.





VENIAMINOF VOLCANO (CAVW#1102-07-)

56°11'44"N 159°23'18"W , Summit Elevation 8225 ft (2507 m)

Current Level of Concern Color Code: YELLOW



Seismicity at Veniaminof remained low this week. A steam plume possibly containing minor amounts of ash was visible earlier in the week. Production of short-lived, very small-volume steam and ash bursts from the intracaldera cone has been typical of this volcano intermittently over the past few years. There are no indications that a larger eruption is imminent. Ash clouds and fallout from these events are not likely to extend beyond the caldera rim, but could pose a hazard to people and low-flying aircraft in the vicinity of the active cone.





CLEVELAND VOLCANO (CAVW#1101-24-)

52°49'24"N 169°56'35"W , Summit Elevation 5676 ft (1730 m)

Current Level of Concern Color Code: Not Assigned



A thermal anomaly and continuous plume was detected in AVHRR satellite data on Monday morning beginning at 1:01 AM AKST (0901 UTC). The plume continued to be detected in satellite images for about six hours extending to about 30 miles southwest of the volcano. Cloud top temperature data suggested a maximum cloud height of 3500 ft asl. There was no indication of ash emission in the observed cloud. No further activity has been detected at Cleveland since Monday morning.



Note: Cleveland volcano does not have a real-time seismic network and therefore we are unable to monitor seismic changes; AVO has no definitive information about background activity.





OTHER ALASKA VOLCANOES



Seismic activity is monitored in real time at 30 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, Spurr, Redoubt, Iliamna, Snowy, Griggs, Katmai, Novarupta, Trident, Mageik, Martin, Peulik, Ukinrek Maars, Aniakchak, Pavlof, Dutton, Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin, Okmok, Korovin, 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:

Chris Waythomas, Scientist-in-Charge, USGS

chris@usgs.gov (907) 786-7497



Chris Nye, Coordinating Scientist, UAF-GI

cnye@giseis.alaska.edu (907) 474-7430



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].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
Contact Information: AVO Web Team

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