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ALASKA VOLCANO OBSERVATORY CURRENT STATUS REPORT
Tuesday, March 24, 2009 12:46 PM AKDT (Tuesday, March 24, 2009 20:46 UTC)


REDOUBT VOLCANO (CAVW #1103-03-)
60°29'7" N 152°44'38" W, Summit Elevation 10197 ft (3108 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: RED

Redoubt remains at Aviation Color Code RED and Alert Level WARNING. Seismic activity at the volcano is currently relatively low, and no activity is observed in partly cloudy web camera images. Pilot reports and satellite images indicate that a steam plume is currently rising to at least 20,000 ft asl and drifting at least 40 miles to the northwest. We have no indication that the volcano is currently emitting ash, though explosive activity could resume with little or no warning.

The last explosive event occurred last night (March 23) at 7:41 pm (AKDT) and lasted for roughly seventeen minutes. The top of the ash cloud was estimated to have reached at least 50,000 ft above sea level based on National Weather Service radar. Winds in the vicinity of the volcano carried the ash cloud primarily to the west and north. Pyroclastic flows were visible traveling down the volcano's north flank in web camera images. Last night's explosive event was the sixth thus far since explosive activity began Sunday, March 22 at 10:38 PM AKDT.

Yesterday, AVO staff visited the area around Redoubt by helicopter to assess conditions and repair equipment damaged by Sunday night's eruptions. They fixed the telemetry link at AVO's observation hut, which is once again transmitting images from the web camera and data from a GPS and two seismic instruments. Clouds obscured the summit, but observers reported very large lahar and flood deposits in the Drift River Valley that likely occurred during and/or following the first five explosions. These flows, which contained ice, water, mud, and other debris, inundated the Drift River Valley and traveled more than 35 km, reaching Cook Inlet. In the middle to upper Drift River Valley, high-water marks reached 6-8 meters above the valley floor. At the AVO hut (roughly 7 miles NNW of the summit), a 6-cm thick fall deposit was observed.

A gas-measurement flight is currently en route to the volcano.

AVO remains staffed 24 hours per day will issue further information as it becomes available.

For up-to-date Ashfall Advisories and wind trajectories, please refer to the National Weather Service website: http://pafc.arh.noaa.gov/volcano.php

CLEVELAND VOLCANO (CAVW #1101-24-)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

AVO has received no new reports of activity at Cleveland over the past 24 hours. Partly cloudy satellite views show nothing unusual.

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

Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131

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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URL: www.avo.alaska.edu/activity/avoreport.php
Page modified: May 16, 2014 09:40
Contact Information: AVO Web Team

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