USGS logo

U.S. Geological Survey
Open-File Report 2004-1033

1999 Volcanic Activity in Alaska and Kamchatka: Summary of Events and Response of the Alaska Volcano Observatory

 Small explosive ash plume that occurred 10 hours after the end of the April 23, 1999 eruptive phase of Shishaldin Volcano. Photo by R.G. McGimsey.

by Robert G. McGimsey, Christina A. Neal, and Olga Girina

The Alaska Volcano Observatory (AVO) monitors 41 historically active volcanoes along the Aleutian Arc. Twenty are seismically monitored and for the rest, the AVO monitoring program relies mainly on daily analysis of satellite images, pilot reports, and observations of local residents and ship's crews. In 1999, AVO responded to eruptive activity or suspect volcanic activity at 7 volcanic centers: Wrangell, Shrub mud volcano, Iliamna, Veniaminof, Pavlof, Shishaldin, and Vsevidof volcanoes. Of these, in 1999, AVO had real-time, continuously recording seismic networks at Iliamna, and Shishaldin. The phrase “suspect volcanic activity” (SVA), used to characterize several responses, is an eruption report or report of unusual activity that is subsequently determined to be normal or enhanced fumarolic activity, weather-related phenomena, or a non-volcanic event.

In addition to responding to eruptive activity at Alaska volcanoes, AVO also disseminated information for the Kamchatkan Volcanic Eruption Response Team (KVERT) about the 1999 activity of four Russian volcanoes: Sheveluch, Klyuchevskoy, Bezimianny, and Karymsky volcanoes.

Department of the Interior
U.S. Geological Survey
Geologic Division
Alaska Science Center
Volcano Hazards Program
Alaska Volcano Observatory

Last update: December 30, 2004

Privacy Statement || Disclaimer || Accessibility