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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY


Information Release


Saturday, September 22, 2007 7:00 AM AKDT (1500 UTC)




AUGUSTINE VOLCANO (CAVW#1103-01-)

59°21'45" N153°26'6" W, Summit Elevation 4134 ft (1260 m)

Current Aviation Color Code: YELLOW

Current Volcano Alert Level: Advisory

Previous Aviation color code: Green

Previous Volcano Alert Level: Normal



Shallow seismic activity at Augustine Volcano has been increasing over the last week and AVO is raising the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. Some disruption of the summit dome may be occurring as a result of this activity and increased rockfall and avalanche activity may occur.



The current earthquakes are small, generally less than magnitude 1.0, and are located at shallow depth beneath the volcano's summit. While significant, the current earthquake activity is much less energetic than that which immediately preceeded the explosive eruptions in January 2006. No anomaliies have been seen in satellite remote sensing data. AVO will continue to monitor the situation closely.



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, 1935, 1963-64, 1976, 1986, and 2006. These eruptions were primarily explosive events that produced volcanic ash clouds (to 30,000-40,000 feet above sea level), ash fall, pyroclasic flows, and 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.



VOLCANO ALERT LEVELS:

NORMAL Typical background activity of a volcano in a non-eruptive state

ADVISORY Elevated unrest above known background activity

WATCH Volcano is exhibiting heightened or escalating unrest with increased potential for eruptive activity

WARNING Highly hazardous eruption underway or imminent



ABBREVIATED AVIATION COLOR CODE KEY:

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



Please see http://volcanoes.usgs.gov/2006/vhpalertlevel.pdf for a complete description of alert levels and color codes.



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, Coordinating Scientist, UAF

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



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].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
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