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.
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