AVO monitors all Alaska volcanoes with satellite and regional infrasound data, and has installed seismic monitoring networks on 33 volcanoes; there are 52 historically active volcanoes in the State. In recent years AVO has deferred maintenance on geophysical monitoring networks at many previously well-monitored Alaskan volcanoes due to insufficient funding. As a result many seismic stations have gradually become inoperable or are functioning intermittently.
OCTOBER 2015 UPDATE: With additional funding in 2015, AVO has reduced the backlog of deferred maintenance, completing repairs at Aniakchak, Gareloi, Tanaga, Westdahl, and Shishaldin volcanoes. As a result, AVO can once again reliably track volcanic unrest at these volcanoes and issue warnings of hazardous eruptive activity should it occur.This map depicts AVO's seismic monitoring capabilities, on a per-volcano basis. Seismic networks at a volcano are classed as "inoperable": Seismic network exists, but has failed.
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.