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Originally posted by geogeek
anybody seen any new photos of REDOUBT activities re: events of last 24 hours ??
People in the Susitna Valley this morning reported a heavy dusting of brown ash and a filmy haze in the sky, though more populated parts of the Mat-Su remained unaffected by the eruption of Mount Redoubt.
At Talkeetna's airport, the National Weather Service reported "light ash covering all surfaces." Ashfall was a bit heavier in the Trapper Creek area to the west, where about a tenth of an inch of ash reportedly covered the snow -- enough that walkers left behind footprints and people scrambled to protect aircraft, schools, generators and vehicles.
"Everything's got a brown tint, and there's a haze in the air," said Susie Seibert, who operates Gate Creek Cabins about 10 miles up Petersville Road with her husband.
Since an erupting Mount Redoubt sent an ash cloud shooting nearly 12 miles high early this morning with its fifth and strongest explosion, the Cook Inlet volcano has remained highly active, the Alaska Volcano Observatory reports. Six to seven smaller, subsequent explosions lasting about two minutes apiece have sent additional ash and gas into the atmosphere since the big blast.
60°29'7" N 152°44'38" W, Summit Elevation 10197 ft (3108 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: RED
Beginning last night (Sunday March 22, 2009) at approximately 22:38 AKDT, Redoubt Volcano produced a series of five explosive eruptions that each lasted from four to thirty minutes. The last one ended at 5:00 AM AKDT this morning (March 23). National Weather Service radar, pilot reports, and AVO analysis of satellite imagery suggest that these events produced ash clouds that reached 60,000 ft above sea level (asl), with the bulk of the ash volume between 25 - 30,000 ft asl. Traces of ash fall have been reported in Skwentna, Talkeetna, Wasilla, and Trapper Creek.
AVO remains at Avation Color Code RED and Alert Level WARNING. Seismic unrest continues at Redoubt in the form of elevated volcanic tremor. NEXRAD radar data show that the last significant ash emission was concurrent with the final explosive event at 5:00 AM AKDT. Since that time, no ash has been visible in radar, suggesting that if ash emission is occurring, it is below approximately 13,000 ft asl and/or too fine to be detected. Poor weather at the volcano currently hinders visual observations.
Last night's explosive eruptions caused melting of the Drift glacier and greatly increased discharge down the Drift River. AVO plans a helicopter overflight to the area today to assess conditions at the volcano and along the Drift River. The explosions also destroyed one seismic station near the volcano's summit (RSO), and disrupted telemetry from AVO's obsveration hut. This telemetry outage affects the web camera, a continuous GPS station, and two broadband seismic stations. Repairs to this data link will be undertaken as conditions permit. Seven telemetered seismic stations surrounding Redoubt remain in operation.
The eruptions were preceded by approximately 60 hours of elevated seismicity in the form of discrete earthquakes under the volcano. AVO raised the Aviation Color Code/Alert Level from YELLOW/ADVISORY to ORANGE/WATCH on Saturday, March 21 at 22:09 AKDT. This increase in seismicity likely reflected the upward movement of magma towards the surface. Prior to this weekend, Redoubt had exhibited signs of volcanic unrest beginning in the Fall of 2008 which then escalated in late January, 2009. Last night's explosions were the first significant ash-producing eruptions of the unrest.
Further explosive activity could occur with little or no warning, and could occur intermittently for weeks or months. 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: pafc.arh.noaa.gov...
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 10,197 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 minor or trace amounts of ash in the city of Anchorage and other nearby communities.
ANCHORAGE, Alaska, March 23, 2009 - Cook Inlet Pipe Line Company (CIPL) Safely secured it's operations at the Drift River Terminal announced that it initiated its shutdown procedures as of a result of the Alaskan Volcano Observatory's upgrade of the code level of Mt. Redoubt from orange level "watch" to red level "warning." CIPL safely secured its operations at its Drift River Terminal on March 22nd to both protect the health and safety of its employees and contractors and to safeguard the environment against a possible spill from its crude storage operations at its facility .......
...... CIPL has managed its tank crude inventory to preserve the structural integrity of its storage tanks and to reduce environmental risk. Two of the seven tanks at the Drift River facility are in use at this time and each tank contains 74,000 barrels of crude
Mar. 23--An erupting Mount Redoubt exploded again this morning at 4:31 a.m. -- its fifth and strongest discharge yet -- sending an ash cloud to new heights, the Alaska Volcano Observatory reported.
- Ash has now been detected at an elevation of 60,000 feet above sea level, the National Weather Service reported.
- Ted Stevens Anchorage International Airport remains open, although some airlines have canceled or diverted flights. Alaska Airlines reported canceling 19 flights in and out of the Anchorage international airport because of the ash.
- Elmendorf Air Force Base in Anchorage told only essential personnel to report to work. The Air Force says 60 planes, including fighter jets, cargo aircraft and a 747 commercial plane, are being sheltered.
- School is in session for Anchorage and Mat-Su schools.
The AVO staff also warned authorities at the Drift River Oil Terminal -- on the western shore of Cook Inlet downriver from the volcano -- that mud flows and flooding from melting glaciers might be headed their way. At a short 3 a.m. press conference today John Powers of AVO said given the hot material landing on snow, mud and snow slides could be expected and staff would check the Drift River area at first light today.
The eruption of Redoubt volcano continues and the color code and volcano alert level remains at RED/WARNING. Seismic activity remains elevated, but has declined slightly over the past several hours. The activity consists mostly of volcanic tremor with some discrete events.
AVO has received no new reports of ash emission since early this morning. The ashfall advisory has expired.
AVO's web camera near the volcano is now functioning and meltwater flooding along the margins of Drift glacier is evident.
AVO has an overflight of the volcano in progress.