Uitbarsting Mount Redoubt (Alaska)

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Rumbling Alaska Volcano Threatens Anchorage
ANCHORAGE, Alaska — Mount Redoubt continues to rumble and simmer, prompting geologists to say this Alaska volcano could erupt "perhaps within hours to days."

Scientists from the Alaska Volcano Observatory have been monitoring activity round-the-clock since the weekend.

If Mount Redoubt does erupt, it would be the first time this occurred in nearly 20 years. And if won't likely be pretty.


_{Eruption picture of 1990}

History shows that volcanoes in Alaska, including Redoubt, typically erupt explosively, shooting ash almost eight miles high.

This differs from volcanoes in Hawaii, which usually have slow rolling lava ooze out.

The difference is gas trying to escape gets blocked, possibly by a lava dome or a viscous magma that increases the power from beneath, said observatory geologist Jennifer Adleman.

"Its pressure keeps building and building...," she said.

Depending on the winds, the ash plume could be pushed straight at Anchorage, the state's largest city. This has prompted state and city officials to post bulletins on how to deal with the ash.



Tips include:

— Stay inside as much as possible.

— Wear a mask or wet bandanna if going outside.

— Those who wear contacts should consider wearing goggles.

According to the U.S. Geological Survey, volcanic ash features small, jagged pieces of rock and glass.

The last time this 10,197-foot peak blew was during a five-month stretch starting in December, 1989. It disrupted international air traffic and placed a layer of volcanic dust throughout the Anchorage area.

Concerns over an eruption have state and city officials issuing warnings so area residents can deal with an ash storm.

The mountain is about 100 miles southwest of Anchorage.

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Op vrijdag 30 januari 2009 10:11 schreef LoggedIn het volgende:
zijn er geen live cams?

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Mount Redoubt is getting edgy
Mount Redoubt, the Alaskan volcano expected to erupt at any time, is getting a bit more edgy.

The Alaska Volcano Observatory said in a statement Friday "volcanic tremor" has increased in "amplitude."


_{Dark areas show a mudflow from the peak of Mount Redoubt earlier this week.}

The activity on the 10,197-foot peak is "more energetic than that of the previous several days. However, it is still less vigorous than that observed last weekend," the observatory said.

Peter Cervelli, a research geophysicist with the observatory, told CNN that "every indication is that we're heading toward an eruption."

Cervelli said scientists don't know exactly when it will happen, but if it does happen, it could be days or weeks -- or even hours.

"I would not be surprised to see it erupt at anytime," Cervelli said. "We're going to know it when we see it."
Scientists raised the alert status Sunday to a "watch" level, the second-highest, based on seismic activity detected January 23.

The peak is about 100 miles southwest of Anchorage, the state's most populous city.

Mount Redoubt last erupted nearly 20 years ago, in December 1989, and that eruption lasted until April 1990. Geologists think there could be an eruption "similar to or smaller than the one that occurred in 1989-90.

That eruption spread ash in Kenai and Anchorage, where it disrupted air traffic operations. Cervelli said the ash plumes caused engine failure on a jet.

The 1989-90 eruption also spurred volcanic mudflows, or lahars, that flowed east down the Drift River. The ash fall was seen as far away as Fairbanks and the Yukon Territory border

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2009-02-02 03:14:48

A high intensity burst of volcanic tremor occurred from about 2:44 through 2:50 AST this morning at Redoubt. The tremor episode appears to have ended for now. There was no eruption associated with this tremor.

AVO continues to observe potential activity with seismic, satellite and radar data. The volcano has not erupted.

Clear weather views from the web camera show nothing but darkness so far this morning.

The Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH.

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2009-02-02 21:55:59

Redoubt Volcano remains restless. Seismic activity remains elevated and is well above background levels. The volcano has not erupted.

A gas/observation overflight today reported continued changes in the summit glaciers indicative of heating of the summit area. The flight and hut webcam photos showed a small vapor plume at the summit. The web camera is now dark for the long winter night.

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Op dinsdag 3 februari 2009 11:30 schreef Drugshond het volgende:
tvp.... qua timing gok ik vaak goed.