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AVO/USGS Volcanic Activity Notice

Volcano: Redoubt (CAVW #1103-03-)

Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: NORMAL

Current Aviation Color Code: YELLOW
Previous Aviation Color Code: GREEN

Issued: Wednesday, November 5, 2008, 2:52 PM AKST (20081105/2352Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A32
Location: N 60 deg 29 min W 152 deg 44 min
Elevation: 10197 ft (3108 m)
Area: Cook Inlet-South Central Alaska

Volcanic Activity Summary: Over the past several months, AVO has detected potentially significant changes in gas emission and heat output from Redoubt Volcano. These changes are a departure from long-observed background activity, and therefore, AVO is raising the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. There is no indication that an eruption is imminent or even certain. AVO is monitoring Redoubt closely and is making plans to install additional equipment on the volcano in the next several weeks.

Recent Observations:
[Other observations] In late July 2008, AVO field crews working around the summit of the volcano smelled hydrogen sulfide gas. In September, AVO received reports of strong hydrogen sulfide smell from a pilot and by workers at the Drift River Oil Terminal 22 miles (35 km) downstream from the volcano. On three separate visits to the volcano since late September, AVO scientists measured elevated levels of carbon dioxide and hydrogen sulfide gas. These gases may indicate that new magma has entered the volcanic system beneath Redoubt. In addition, areas of bare, steaming rock and disrupted ice at the mouth of and just below the summit crater indicate increased heat output. The warming was also seen in high-resolution nighttime ASTER satellite images on October 13. Fumarolic activity and water flowing beneath Drift Glacier on the north flank of the volcano has produced a 150-foot wide melt or collapse hole at an elevation of about 5,600 ft (1,705 m) on the Drift Glacier. On November 2, a slushy debris-flow deposit emanated from about the location of the 1966-68 vent.

Since AVO became aware of the gas emissions and thermal activity, there has been only a modest increase in the number of low-frequency earthquakes at the volcano. This suggests that if new magma has entered the volcanic system, it is still quite deep. AVO has not detected any deformation at the volcano, but the steep terrain and extensive ice cover, make it difficult to detect deformation with available techniques. It is possible that the anomalous thermal activity and gas emissions reflect adjustments of the volcano’s hydrothermal system and the still-cooling intrusion from the 1989-90 eruption.

Hazard Analysis:
[General hazards] At the current level of unrest, the primary potential hazards are steam explosions in the summit region, noxious gas plumes in the summit crater and adjacent Drift Glacier, ice and mixed ice-rock-water avalanches down the steep portion of Drift Glacier, and possibly sudden increases in water flow in the Drift River Valley. Based on the well-monitored eruption of 1989-90, AVO would expect a significant increase in seismicity prior to any explosive eruption.

A hazard assessment for Redbout Volcano can be obtained at http://www.avo.alaska.edu/pdfs/redoubt_ofr.pdf

Remarks: Heavily ice-mantled Redoubt volcano is located on the western side of Cook Inlet, 170 km (106 mi) southwest of Anchorage and 82 km (51 mi) west of Kenai, within Lake Clark National Park. Redoubt is a stratovolcano which rises to 10,198 feet above sea level. Recent eruptions occurred in 1902, 1966-68, and 1989-90. The 1989-90 eruption produced mudflows, or lahars, that traveled down the Drift River and partially flooded the Drift River Oil Terminal facility. The ash plumes produced by the 1989-90 eruption affected international air traffic and resulted in about 5 mm (0.2 inches) of ash in Kenai and trace amounts of ash in Anchorage and other nearby communities.

Contacts: Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497

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

Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at http://www.avo.alaska.edu

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.


(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:(20081105/2352Z)
(3) Volcano:Redoubt (CAVW# 1103-03-)
(4) Current Color Code:YELLOW
(5) Previous Color Code:green
(6) Source:Alaska Volcano Observatory
(7) Notice Number:2008/A32
(8) Volcano Location:N 60 deg 29 min W 152 deg 44 min
(9) Area:Cook Inlet-South Central Alaska
(10) Summit Elevation:10197 ft (3108 m)
(11) Volcanic Activity Summary:Over the past several months, AVO has detected potentially significant changes in gas emission and heat output from Redoubt Volcano. These changes are a departure from long-observed background activity, and therefore, AVO is raising the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. There is no indication that an eruption is imminent or even certain. AVO is monitoring Redoubt closely and is making plans to install additional equipment on the volcano in the next several weeks.
(12) Volcanic cloud height:Unknown
(13) Other volcanic cloud information:Unknown
(14) Remarks:Heavily ice-mantled Redoubt volcano is located on the western side of Cook Inlet, 170 km (106 mi) southwest of Anchorage and 82 km (51 mi) west of Kenai, within Lake Clark National Park. Redoubt is a stratovolcano which rises to 10,198 feet above sea level. Recent eruptions occurred in 1902, 1966-68, and 1989-90. The 1989-90 eruption produced mudflows, or lahars, that traveled down the Drift River and partially flooded the Drift River Oil Terminal facility. The ash plumes produced by the 1989-90 eruption affected international air traffic and resulted in about 5 mm (0.2 inches) of ash in Kenai and trace amounts of ash in Anchorage and other nearby communities.
(15) Contacts:Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497

Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131
(16) Next Notice:A new VONA will be issued if conditions change significantly or alert levels are modified. While a VONA is in effect, regularly scheduled updates are posted at http://www.avo.alaska.edu
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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