Tag:natural=fumarole

A Fumarole is an opening in a planet's crust, which emits steam and gases. They are found in volcanic areas and geothermal fields.

See also Fumarole on Wikipedia

How to map

Set a node and add natural=fumarole.

Similar tags

Fumaroles are similar to geysers and hot_springs. There are a few key differences:

• Hot Springs produce hot water.
• Fumaroles emit small quantities of steam/gas (no liquid water, but they may cause nearby water to boil).
• Geysers dramatically eject a large volume of water and steam in a burst upwards.

Helpful diagram

Examples of fumaroles

• 
  A fumarole on Whakaari / White Island, New Zealand
• 
  A fumarole at Námafjall, Iceland
• 
  Less dramatic fumaroles at Karapiti / Craters of the Moon, New Zealand

Examples of ambiguous situations

• 
  A fumarole beneath a mud pool, which causes the mud to boil and bubble. If it is producing water, use hot_spring. If it is only producing steam/gas, use fumarole.
• 
  Geothermal steam rising out of a storm drain.

Examples of other geothermal features

• 
  Not a fumarole: use
  natural=geyser
• 
  Not a fumarole: use
  natural=hot_spring
• 
  Not a fumarole: use
  natural=hot_spring
  and map the hot water as
  natural=water + geothermal=yes
• 
  geological=volcanic_mofetta
• 
  geological=mud_volcano

Extinct fumaroles

Fumaroles may become extinct, either as a natural process or if geothermal bores or power plants are constructed nearby. Extinct fumaroles should normally be deleted from OSM. In rare cases, if they are very significant they could be mapped as was:natural=fumarole.

See also

• natural=geyser
• natural=hot_spring
• geological=volcanic_mofetta
• geological=mud_volcano

Possible tagging mistakes

natural=geothermal_area

		$1%
		$1%
		$1%
		$1%

More details at taginfo

• natural=geothermal_area

If you know places with this tag, verify if it could be tagged with another tag.
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