A fumarole (or fumerole – the word ultimately comes from the Latin fumus, "smoke") is an opening in a planet's crust which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide. The steam forms when superheated water boils as its pressure drops when it emerges from the ground. A fumarole that emits sulfurous gases can be referred to as a solfatara (from old Italian solfo,  "sulfur", although the modern Italian spelling is zolfo). Fumaroles may occur along tiny cracks, along long fissure, or in chaotic clusters or fields. They also occur on the surface of lava or pyroclastic flows.  A fumarole field is an area of thermal springs and gas vents where shallow magma or hot igneous rocks release gases or interact with groundwater.  When they occur in freezing environments, fumaroles may cause fumarolic ice towers.
Fumaroles may persist for decades or centuries if located above a persistent heat source; or they may disappear within weeks to months if they occur atop a fresh volcanic deposit that quickly cools.  The Valley of Ten Thousand Smokes, for example, was formed during the 1912 eruption of Novarupta in Alaska. Initially, thousands of fumaroles occurred in the cooling ash from the eruption, but over time most of them have become extinct.
An estimated four thousand fumaroles exist within the boundaries of Yellowstone National Park in the United States. In April 2006 fumarole emissions killed three ski-patrol workers east of Chair 3 at Mammoth Mountain Ski Area in California. The workers were overpowered by toxic fumes (a mazuku) that had accumulated in a crevasse they had fallen into.  Another example is an array of fumaroles in the Valley of Desolation in Morne Trois Pitons National Park in Dominica.
Fumaroles emitting sulfurous vapors form surface deposits of sulfur-rich minerals and of fumarole minerals; places in which these deposits have been mined include:
- Kawah Ijen and Arjuno-Welirang, Indonesia
- Purico Complex  near San Pedro de Atacama in Chile
- Xingyang in Henan province, China
- Mt Tongariro in the central North Island, New Zealand
- White Island in the Bay of Plenty, New Zealand (mined from the 1880s to the 1930s)
- Solfatara in Campi Flegrei in Italy
- "Solfatara". Merriam-Webster.com Dictionary. Merriam-Webster. Retrieved 20 February 2020.
- This article incorporates public domain material from the United States Geological Survey document: "Fumarole". USGS Photo Glossary. Retrieved 2019-02-06.
- Neuendorf, Klaus K. E. (2005). Jackson, Julia A.; Mehl, James P.; Neuendorf, Klaus K. E. (eds.).
Glossary of Geology. Springer Science & Business Media. p. 257.
9780922152766. Retrieved 2015-06-06.
fumarole field[:] A group of cool fumaroles.
- Hymon, Steve; Covarrubias, Amanda (2006-04-09). "How Routine Turned to Tragedy at Mammoth". Los Angeles Times. Retrieved 2011-05-09.
- Global Volcanism Program, National Museum of Natural History, Smithsonian Institution
- R.V.Morris, S.W.Squyres, et al. "The Hydrothermal System at Home Plate in Gusev Crater, Mars". Lunar & Planetary Science XXXIX(2008)
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