Printer friendly versionALASKA VOLCANO OBSERVATORY
Saturday, September 22, 2007 7:00 AM AKDT (1500 UTC)
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
Tom Murray Scientist-in-Charge, USGS
firstname.lastname@example.org (907) 786-7497
Steve McNutt, Coordinating Scientist, UAF
email@example.com (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.