A geyser is a spring characterised by intermittent discharge of water and steam.



geyser, thermal water, eruption, magma chamber, ejected water, geyser cone, conduit, volcanic activity, volcano, post-volcanic activity, nature, geography

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Post-volcanic activity; a spring characterised by intermittent discharge of water. Water is collected in an underground reservoir (and in fractures connected to that), where it is heated from under by the heat of a magma chamber, then it erupts like a fountain.


  • fractures
  • reservoir
  • magma chamber
  • geyser cone


  • fractures
  • reservoir
  • magma chamber
  • ejected water
  • geyser cone


Water seeps down through fractures in rocks into an underground reservoir and a pipe connecting it to the surface.
The water is heated from below by the heat of a magma chamber until it erupts violently as hot steam. In the air this steam condenses and falls back onto the surface and into the pipe. Water seeps down again into the reservoir and the process starts again.

Eruptions occur at regular intervals. Some geysers erupt every few minutes or every day while others may erupt just once a month. Around the mouth of the pipe a small cone is usually formed from mineral deposits.

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