DescrizioneCollecting Gas Sample at a Fumarole (17932082790).jpg
Collecting Gas Sample at a Fumarole — USGS geologist Deborah Bergfeld is shown here collecting a gas sample from a superheated (hotter than the boiling point) fumarole in Little Hot Springs Valley at Lassen Volcanic National Park, California.
Fumaroles are vents from which volcanic gas escapes into the atmosphere. Fumaroles may occur along tiny cracks or long fissures, in chaotic clusters or fields, and on the surfaces of lava flows and thick deposits of pyroclastic flows. They may persist for decades or centuries if they are above a persistent heat source or disappear within weeks to months if they occur atop a fresh volcanic deposit that quickly cools. Photo credit: Fred Murphy, USGS.
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