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> 1/11/06 Mt. Augustine located in Alaska has erupted.
Paul Cowan
post Jan 11 2006, 04:10 PM
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Mt. Augustine, located about 200 miles southwest of the city of Anchorage, erupted today at 4am local time with two large explosions. The volcanic cloud is rising 5 miles into the atmosphere. The ash content of the cloud is low and it is moving east and is not expected to reach Anchorage.

Residents of the Kenai Peninsula have been reporting ash fall. The volcano is on an uninhabited island.


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thundercloud
post Jan 11 2006, 07:45 PM
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A 26,000 plus foot ash plume, eh, thats pretty impressive. My grandmother lives in Kenai...


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thundercloud
post Jan 11 2006, 08:09 PM
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There have been over 250 quakes in the volcano within the past week alone.

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

Most likely scenario according to AVO is:

"Eruption similar to those of 1976 and 1986: Unrest continues to escalate culminating in an eruption that is similar to those that occurred in 1976 and 1986. An eruption such as this would likely spread volcanic ash throughout and perhaps beyond Cook Inlet depending upon the prevailing winds. Much of Augustine Island would be inundated by pyroclastic flows, mud flows, ash fall, and ballistic showers."


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thundercloud
post Jan 11 2006, 08:16 PM
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Additional info from AVO's afternoon report.

"January 11, 2006
Level of Concern Color Code: RED

Unrest continues at Augustine Volcano and additional eruptive activity could occur at any time.

AVO recorded two discrete explosions at the summit of Augustine Volcano this morning at 4:44 a.m. and 5:13 a.m. (AST) and responded by changing the level of concern color code from ORANGE to RED. Satellite data confirm that an ash cloud was produced and in collaboration with the National Weather Service (NWS), the height of the cloud was estimated at 30,000 feet above sea level. NWS and AVO are tracking the ash plume which has detached from the vent and is presently drifting to the north and east of Augustine. As of about 10:45 a.m. (AST), the ash cloud has moved little since this morning and is about 30 mi (50 km) east and 45 mi (72 km) north of the volcano. An ash-fall advisory was issued by the NWS at 6:44 a.m. (AST) for the west side of Cook Inlet north of Augustine Island and remains in effect until 2:00 p.m. (AST). AVO has received no confirmed reports of ash fall.

Web camera views of the lower flanks of the volcano indicate that small volcanic mudflows (lahars) have formed and extend to about 500 feet above sea level. These flows pose no hazard beyond Augustine Island.

Seismicity has decreased significantly since the explosions, however, it is likely that stronger seismicity and further volcanic activity will resume.

There is no tsunami hazard associated with the current level of activity.

If the volcano follows a pattern similar to the 1976 and 1986 eruptions, we would expect a further intensification of seismic activity prior to similar or larger explosive events. It is also possible that an explosive eruption could occur with little or no warning.

AVO is monitoring the situation closely and will issue further updates as new information and analyses become available."


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Paul Cowan
post Jan 11 2006, 10:44 PM
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Thanks for the great updates Artie!

Jessie was re-doing all the forums when I posted about St.Helen's and he wrote and said he would start a new forum about these non-weather events and we would see how it goes. I told him there most likely wouldn't be much action and now there is an eruption in the u.s. :shock:

I wonder if your grandmother heard the explosions. My wife heard St. Helens go. She was just east of Seattle in Redmond,Wa.. She said that it sounded like the paper boy was throwing the paper against the garage door.

Hope your grandmother is safe.


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Paul Cowan
post Jan 13 2006, 12:01 PM
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Augustine erupted for a third and more powerful time just before 4 am on Friday. The eruption lasted for forty-five minutes and ash was heading for the southeast section of the Kenai Peninsula. This is an early report and more information on this eruption is likely to be released later.


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thundercloud
post Jan 13 2006, 02:00 PM
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AVO continues to list the volcano as a code red situation. The following is the latest report.

"ALASKA VOLCANO OBSERVATORY
INFORMATION RELEASE
Friday, January 13, 2006 5:20 AM AKST (1420 UTC)

AUGUSTINE VOLCANO (CAVW#1103-01-)
59.3633N 153.4333W, Summit Elevation 4134 ft (1260 m)
Current Level of Concern Color Code: RED

The eruption at Augustine Volcano, which began at approximately 3:55 AM (AST), has ended at 4:39 AM (AST), for a total duration of 44 minutes. The National Weather Service is reporting ash heights of 34,000 feet above sea level and is expected to move east.

Renewed activity in the next few hours or days is likely, and may occur with little or no warning.

AVO continues to monitor the situation closely."

The color coding is defined as:

GREEN: volcano is dormant; normal seismicity and fumarolic activity occurring

YELLOW: volcano is restless; eruption may occur

ORANGE: volcano is in eruption or eruption may occur at any time

RED: significant eruption is occurring or explosive eruption expected at any time

The latest webcam image shows a large amount of dark ash in the air on the eastern part of St Augustine Island.


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thundercloud
post Jan 13 2006, 02:03 PM
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From the NWS WFO at Anchorage.

WESTERN KENAI PENINSULA-
INCLUDING...KENAI...SOLDOTNA...HOMER...COOPER LANDING
KODIAK ISLAND-
INCLUDING...KODIAK CITY
930 AM AST FRI JAN 13 2006

...ASHFALL ADVISORY IN EFFECT UNTIL 4 PM AST THIS AFTERNOON FOR THE SOUTHWEST KENAI PENINSULA INCLUDING NINILCHIK HOMER AND SELDOVIA...THE ALASKA VOLCANO OBSERVATORY HAS REPORTED THAT AUGUSTINE VOLCANO ERUPTED AGAIN AROUND 850 AM AST THIS MORNING.

AN ASH CLOUD HAS BEEN DETECTED BY THE NATIONAL WEATHER SERVICE DOPPLER RADAR AND WAS REPORTED BY PILOTS. THIS ASH CLOUD IS MOVING EAST NORTHEAST. IT IS EXPECTED TO REACH HOMER AND WESTERN KACHEMAK BAY AROUND 1 PM AST. A LIGHT ASH FALL MAY OCCUR.

RESIDENTS SHOULD REMAIN AT HOME OR INDOORS AND REDUCE OUTSIDE ACTIVITY. KEEP WINDOWS AND DOORS CLOSED. DO NOT EXERCISE OUTDOORS.

FOR ADDITIONAL INFORMATION VISIT WWW.VOLCANO.GOV


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thundercloud
post Jan 13 2006, 06:14 PM
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This just in from AVO:

Still labeled CODE RED

"Several explosive events occurred at Augustine Volcano this morning: at approximately 3:55 AM AST (13:24 UTC); 8:47 AM AST (17:47); and 11:22 AM AST (20;22). Pilot reports and satellite imagery confirm ash clouds in excess of 30,000 ft above sea level moving eastward. Seismic data suggest that pyroclastic flows and lahars (volcanic mudflows) are occurring on the flanks of the island and possibly extending beyond.

Similar short-lived explosive activity is expected to continue over the next several days or weeks. Individual explosions are expected to produce ash plumes accompanied by pyroclastic flows and lahars (volcanic mudflows) on the flanks of the volcano."

The latest webcam image shows that virtually all of the ice that had engulfed the volcano a few days ago is completely gone. The crater is still ejecting steam and there is a haze over the island.

The webcam shot from Homer, AK is completely dark, even now at 2pm AST.


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thundercloud
post Jan 13 2006, 06:43 PM
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As of 2pm, the webcam on the eastern part of Augustine Island shows a plume of steam coming from the crater and towering high above the mountain. All of the snow and ice that was on the volcano now appears to be gone. The resolution of the camera shot isn't high enough to determine if any vegitation survived the lethal pyroclastic flows.


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Paul Cowan
post Mar 16 2006, 12:37 AM
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Just to update as of March 15... Augustine is still active but is in a rapid dome building phase.The increased vibrations are due to falling dome rocks. The magma from the mountain tends to be thick like toothpaste and is oozing rather than flowing like Hawaii volcanoes do. Steam is rising from the top but not much ash is involved. The dome building should continue for several months and of course, eruptions and explosians cannot be ruled out.


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