USGS/Cascades Volcano Observatory, Vancouver, Washington
CVO Photo Archives -
Acoustic Flow Monitors
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Acoustic Flow Monitor (AFM) site in the Drift River valley, near Redoubt Volcano, Alaska. The key component of
the AFM system is a seismometer, buried in the ground nearby, that responds to the high-frequency (10-300 Hz)
vibrations that characterize lahars. Inspired by the Nevado del Ruiz tragedy in 1985, the AFM system was
developed and tested at Mount Redoubt, and then successfully used in the Philippines to monitor lahars at Mount
Pinatubo.
-- USGS Photo by S. R. Brantley
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03/25/02, Lyn Topinka
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