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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

Wednesday, January 11, 2006 4:15 PM AKST (115 UTC)




AUGUSTINE VOLCANO (CAVW#1103-01-)

59.3633°N 153.4333°W, Summit Elevation 4134 ft (1260 m)

Current Level of Concern Color Code: RED



Unrest at Augustine continues and seismicity has begun to increase to higher levels over the past 4 hours. This may indicate that additional eruptive episodes are possible in the next 24 to 48 hours.



AVO scientists made an over flight of the volcano this afternoon and observed a pure white steam cloud rising to about 11,500 feet above sea level and drifting northeast. Very little volcanic ash was observed on the island itself, although volcanic mudflows were evident on the east, south and west sides of the volcano. AVO observers also noted minor rock and snow avalanche deposits high on the southwest part of the edifice.



The ash plume that was produced early this morning has begun to dissipate and AVO has received reports of a brown haze in the air over the central part of Cook Inlet. Significant ash fall from the ash cloud produced this morning is not expected, but it is possible for a very light dusting of ash to occur on areas northwest of Augustine Island. Ash fall from this ash cloud is not expected to occur in Anchorage and vicinity.



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.



U.S. Geological Survey: Hazards associated with volcanic ash fall

http://volcanoes.usgs.gov/ash/



NOAA National Weather Service: Ash cloud trajectories and aviation warnings

http://pafc.arh.noaa.gov/augustine.php



NOAA West Coast and Alaska Tsunami Warning Center: Tsunami issues related to Augustine

http://wcatwc.arh.noaa.gov/Augustine/AugustineWeb.htm



Alaska Division of Homeland Security and Emergency Management: Community preparedness

http://www.ak-prepared.com/plans/mitigation/volcano.htm





Augustine Volcano is a 1260 m high (4134 ft) conical-shaped island stratovolcano located in southern Cook Inlet, about 290 km (180 mi) southwest of Anchorage, Alaska and 120 km (75 mi) southwest of Homer, Alaska. Historically, Augustine is the most active volcano in the Cook Inlet region with significant eruptions in 1812, 1883, 1908, 1935, 1963-64, 1976, and 1986. These eruptions were primarily explosive events that produced volcanic ash clouds (to 30,000-40,000 feet above sea level), ash fall, pyroclastic flows, and lava domes or flows. During the 1883 eruption, a large avalanche on the north flank of the volcano flowed into Cook Inlet and may have initiated a tsunami observed at Nanwalek, about 90 km to the east.



ABBREVIATED COLOR CODE KEY (contact AVO for complete description):

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



VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu

RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478



CONTACT INFORMATION:

Tom Murray, Scientist-in-Charge, USGS

tlmurray@usgs.gov (907) 786-7497



Steve McNutt, Acting Coordinating Scientist, UAF-GI

steve@giseis.alaska.edu (907) 474-7131 OR (907) 474-7274



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.
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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Page modified: May 27, 2014 10:23
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