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Redoubt volcano alert at Orange - constant seismic activity

Re: Redoubt volcano alert at Orange - constant seismic activity

As an example of what would happen to BF websites if a pandemic starts...
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Alaska Volcano Observatory
Information Statement
Friday, January 30, 2009 7:16 AM AKST (1616 UTC)


Redoubt Volcano
60?29'7" N 152?44'38" W, Summit Elevation 10197 ft (3108 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Unrest at Redoubt Volcano continues, though no eruption has yet occurred. Seismicity levels have risen within the last 8 hours. Redoubt remains at Aviation Color Code ORANGE and Volcano Alert Level WATCH.

AVO's website has been overwhelmed with traffic this morning because of extensive national news coverage. A backup, low-bandwidth webserver is operating with limited information.

Staff are currently monitoring the volcano 24 hours a day. We will issue further information as it becomes available.

http://www.avo.alaska.edu/activity/index.php
 
Re: Redoubt volcano alert at Orange - constant seismic activity

AlaskaDenise said:
As an example of what would happen to BF websites if a pandemic starts...
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Click to expand...

Yes, as long as the internet would be there, this would mean a choice between: a website down, or up with subscription, and/or a similar solution like the AVO decided to do.
 
Re: Redoubt volcano alert at Orange - constant seismic activity

In a pandemic, I would imagine the IT people would be busy setting up mirror sites STAT! Access to many good sites (like FT) might be difficult.
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The military bases in Anchorage are passing out masks to their people and telling them that IF the mountain erupts, they expect it to happen within 2-3 days. They've been briefed on how to protect sensitve electronic equipment and told to stay home until they get the word to return, IF THE MOUNTAIN ERUPTS.

We're hearing that many employers in Anchorage are passing out masks to their employees. Some of the younger population are "amused" by the preparation concept - the "it can't happen here" or "it couldn't possibly be really bad" mentality is alive and well. :rolleyes:

Elmendorf Air Force Base is home to many expensive aircraft. I would expect them to fly them elsewhere, IF they get sufficient notice of an eruption. Anchorage is also home to Ft. Richardson Army Base.

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Re: Redoubt volcano alert at Orange - constant seismic activity

2009-01-30 14:35:54
Intense seismicity continues at Redoubt this afternoon. Clear webcam views, satellite, and radar data from earlier today indicate that the volcano has not yet erupted.

Clouds have moved in to obscure the webcam view over the last hour.

An AVO observation flight returned in the last hour and reports no sign of ash emission, but observed significant steaming from a new melt depression at the mouth of the summit crater near the vent area of the 1989-90 eruption.

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

http://www.avo.alaska.edu/

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Local TV reports have said that should the mountain erupt and it is dark or cloud obscure the view, they expect the weather radar can detect an ash cloud.

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Re: Redoubt volcano alert at Orange - constant seismic activity

Dutchy said:
Yes, as long as the internet would be there, this would mean a choice between: a website down, or up with subscription, and/or a similar solution like the AVO decided to do.
Click to expand...
Volcano watchers crash AVO Web site
[FONT=VERDANA, ARIAL, HELVETICA, SANS-SERIF][/FONT]
<!-- Story Photo -->
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[FONT=VERDANA, ARIAL, HELVETICA, SANS-SERIF][SIZE=-1]By TOM KIZZIA
tkizzia@adn.com
pixel.gif

(01/30/09 10:53:14) [/SIZE][/FONT]
[FONT=VERDANA, ARIAL, HELVETICA, SANS-SERIF][SIZE=-1]

Redoubt volcano's rumblings slowed a bit this morning after a busy night, but a burst of pre-dawn news coverage triggered an eruption of Internet traffic that has shut down the Alaska Volcano Observatory's ultra-cool Web site, at least temporarily.


Overnight news reports of Redoubt's expected eruption were featured prominently this morning on Web sites for CNN, the Drudge Report, Google and even the "news-for-nerds" site Slashdot. The stories included "hot links" to the AVO Web site.

"Pretty much when the East Coast woke up, everybody hit it all at once," said Peter Cervelli, a volcano observatory geophysicist who was on duty at 4:30 a.m. when the system crashed.

Fortunately, the volcano scientists had anticipated such a problem and had a low-bandwidth version of their Web site ready to put in place. "We had a taste of this when Augustine (volcano) went in 2006, and knew it was only going to get worse," Cervelli said.

For now, browsers on the AVO site can get the very basic report on Redoubt and the latest updates -- but no seismographs, wind trajectory maps, live cameras or photographic histories of past eruptions.

University of Alaska technicians are working to distribute the high-bandwidth load to other computer servers around the country so that the full system can go back in service, Cervelli said this morning.

"We like to think this is the price of success," he said.

Cervelli added that the scientists' internal data from seismometers and cameras are all run through different circuits and weren't affected by the Internet traffic.
Redoubt remains at Code Orange, with the alert level at "Watch" and an eruption considered likely.
http://www.adn.com/news/alaska/v-printer/story/673362.html

[/SIZE][/FONT]
 
Re: Redoubt volcano alert at Orange - constant seismic activity

Dutchy said:
Yes, as long as the internet would be there, this would mean a choice between: a website down, or up with subscription, and/or a similar solution like the AVO decided to do.
Click to expand...

Virtual World is so hardly based upon real cables...


<table style="width: auto;"><tbody><tr><td></td></tr><tr><td style="font-family: arial,sans-serif; font-size: 11px; text-align: right;">From MAPS</td></tr></tbody></table>
 
Re: Redoubt volcano alert at Orange - constant seismic activity

Source: http://www.foxnews.com/story/0,2933,486347,00.html

Enlarging Hole at Alaska Volcano Fuels Eruption Concerns
Sunday, February 01, 2009

ANCHORAGE, Alaska ? Geologists monitoring Mount Redoubt for signs of a possible eruption noticed that a hole in the glacier clinging to the north side of the volcano had doubled in size overnight ? and now spans the length of two football fields.

Scientists with the Alaska Volcano Observatory on Friday flew close to Drift Glacier and spotted vigorous steam emitted from a hole on the mountain. By Saturday, they had confirmed the area was a fumarole, an opening in the earth that emits gases and steam, that was increasing in size at an alarming rate.

They also saw water streaming down the glacier, indicating heat from magma is reaching higher elevations of the mountain.

"The glacier is sort of falling apart in the upper part," research geologist Kristi Wallace said.

The signs of heat add to concerns that an eruption is near, which could send an ash cloud about 100 miles northeast toward Anchorage, the state's largest city, or onto communities on the Kenai Peninsula, which is even closer to the mountain on the west side of Cook Inlet. It would be the first eruption since 1990.

Particulate released during an eruption has jagged edges and can injure skin, eyes and breathing passages, especially in young children, the elderly and people with respiratory problems.

It can also foul engines. An eruption in December 1989 sent out an ash cloud 150 miles that flamed out the jet engines of a KLM flight carrying 231 passengers on its way to Anchorage. The jet dropped more than two miles before pilots were able to restart the engines and land safely.

A week ago, the observatory detected a sharp increase in earthquake activity below the volcano and upgraded its alert level to orange, the stage just before full eruption. The warning that an eruption was imminent caused a rush on dust masks and car air filters in Anchorage.

Alaska's volcanoes typically start with an explosion that can shoot ash 50,000 feet high and into the jet stream, but there are warning signs because magma causes small earthquakes as it moves.

Geologist Jennifer Adleman said the observatory has been recording quakes up to magnitude 2.1 but not at the frequency that preceded the last two eruptions in 1989 and 1990.

"We're looking for an increase of seismicity to match the precursor activity," Wallace said. "We haven't seen that yet."
 
Re: Redoubt volcano alert at Orange - constant seismic activity

The three seigmographs on the mountain point to different activity on different sides of the mountain.

After a quiet night (except for a couple of hiccups), this morning (between 20:20 and 21:15), there was activity showing mostly on the north (RDN) side (site of existing fumerole) and slightly on the east (REF) side, with almost nothing showing on the south (RSO) side.

Currently (starting at 23:06:30) there is activity showing strongest on the south side, somewhat on the east side, and barely on the north side.

BTW, local time is UTC -9.
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Re: Redoubt volcano alert at Orange - constant seismic activity

Here is a seismograph reading from Redoubt's 1989-1990 eruption (they had about 23 hours warning):
vdap_ev9.jpg

Figure 9 -- Real-Time Seismic-Amplitude Measurement (RSAM) plot. Comparison of RSAM data (top) and seismograms (bottom) shows how RSAM reduces complex seismic data to a simple line graph that correlates with ground-shaking energy. Eruptions (heavy dark lines) from Mount Redoubt occurred at 09:47 am, and 10:15 am on the 14th and 15th of December, 1989.
source: http://vulcan.wr.usgs.gov/Monitoring/Descriptions/description_RSAM_SSAM.html
 
Re: Redoubt volcano alert at Orange - constant seismic activity

Four major types of seismograms, or "seismic signatures," are recognized from seismometers in the vicinity of Mount St. Helens. Seismologists review and classify the seismic records daily.
source: http://vulcan.wr.usgs.gov/Glossary/Seismicity/description_seismic_monitoring.html

volcano quakes types.gif

The following major types of seismograms have been recognized at Mount St. Helens: (1) deep earthquakes and those located away from the volcano, which produce high-frequency signatures and sharp arrivals similar to tectonic earthquakes, (2) shallow earthquakes, located under the dome at depths of less than 3 kilometers, which produce medium-to-low-frequency seismic arrivals, (3) surface events, such as gas and tephra events, rockfalls associated with dome growth, and snow and rock avalanches from the crater walls, which produce complicated signatures with no clear beginning or end, and (4) harmonic tremor, which is a long-lasting, very rhythmic signal whose origin is not well understood but which is often associated with active volcanoes.



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Last edited:
Re: Redoubt volcano alert at Orange - constant seismic activity

from the same source as above...

Seismogram from Garden Seismic Station, showing an increase in earthquakes during a dome-building eruption of Mount St. Helens.
typical dome building quakes.gif

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Note the similarity to the seismograph of the 1989 Redoubt eruption.
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Re: Redoubt volcano alert at Orange - constant seismic activity

AVO site is up (now).

Redoubt Volcano Latest Observations

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.

http://www.avo.alaska.edu/activity/Redoubt.php
 
Re: Redoubt volcano alert at Orange - constant seismic activity

It sure was big. It occured after about 6 hours of harmonic tremors - and they're still continuing. They often preceed an eruption.

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Re: Redoubt volcano alert at Orange - constant seismic activity

Redoubt: A short, high-intensity burst of volcanic tremor occurred at 8:47 AKST this morning, and since then a series of small repeating earthquakes is ongoing.

There is no eruption associated with this earthquake activity.

The volcano is just now appearing in the Redoubt HutCam, and no steam plume is visible.

AVO continues to observe potential activity with seismic, satellite and radar data. The volcano has not erupted.The Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH.

http://twitter.com/alaska_avo
 
Re: Redoubt volcano alert at Orange - constant seismic activity

Redoubt Volcano Latest Observations

2009-02-02 11:23:53

Since 8:47 AKST this morning, seismic activity beneath the volcano has increased slightly. We have no indications that an eruption has occurred.

A slight steam plume is visible this morning in images from the Redoubt HutCam.

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

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

http://www.avo.alaska.edu/activity/Redoubt.php
 
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