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Seismogram from Garden Seismic Station, showing an increase in earthquakes during a dome-building eruption of Mount St. Helens.
-- USGS Photo by Lyn Topinka

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Seismograph in action at Pinatubo response. Signals from some seismometers are always recorded on analog drum recorders. Despite advances in computer-based data acquisition, drum recorders are still needed. A glance at the seismogram wrapped around the drum gives experienced volcanologists a quick appreciation of the current level of seismic activity at the volcano.
-- USGS Photo by R. P. Hoblitt

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Response to the Mount Pinatubo crisis in the Philippines. USGS and PHIVOLCS personnel install a seismic station near Mt. Pinatubo six weeks before the devastating eruptions. Installation of a monitoring network is a team effort.
-- USGS Photo by J. A. Power

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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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