Hot spring

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Grand Prismatic Spring and Midway Geyser Basin in Yellowstone National Park
Hot spring in Lassen Volcanic National Park

A hot spring is a spring produced by the emergence of geothermally heated groundwater from the Earth's crust. Hot springs are in many places, especially in mountains.

Definitions[change | change source]

"Blood Pond" hot spring in Beppu, Japan

There is no universally accepted definition of a hot spring. For example, one can find the phrase hot spring defined as

  • any geothermal spring [1]
  • a spring with water temperatures above its surroundings [2][3]
  • a spring with water temperatures above 50 °C (122 °F) [4]
  • a natural spring with water temperature above body temperature – normally between 36.5 and 37.5 °C (97.7 and 99.5 °F) [5][6][7][8][9]
  • a natural spring of water greater than 21.1 °C (70 °F) (synonymous with thermal spring) [10][11][12][13]
  • a natural discharge of groundwater with elevated temperatures [14]

Sources of heat[change | change source]

The water issuing from a hot spring is heated by geothermal energy, i.e., heat from the Earth's mantle.

Related pages[change | change source]

References[change | change source]