Volcanic gas

Volcanic gases are gases given out by active volcanoes or sometimes not active volcanoes. They come from gases trapped in holes in volcanic rocks, dissolved or separated gases in magma and lava, or gases coming from lava, volcanic craters, or openings. Volcanic gases can also be released through water heated by volcanic activity.

Volcanic gases going into the atmosphere with tephra during eruption of Augustine Volcano, Alaska in 2006.

Volcanic gases on Earth come from sources which include:

• Gases from the Earth's mantle, which include ancient and recycled materials.
• Gases that are absorbed from the Earth's crust.
• Gases taken from groundwater and the Earth's atmosphere.

Volatile substances are materials that can turn into gas or release gases when heated.

Volcanic Gas Media

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  Volcanic gases entering the atmosphere during the eruption of Mount Etna in 2002

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  Sketch showing typical carbon dioxide emission patterns from volcanic and magmatic systems

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  Average carbon dioxide (CO2) emissions of subaerial volcanoes globally from the time period of 2005 to 2017

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  Degassing at the summit crater of Villarrica, Chile

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  Schematic of volcanic eruption

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  Vog in Hawaii, Kilauea 2008 eruptions

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  Eruption columns of mixed eruption at Holuhraun, Iceland in 2014

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  Degassing lava field, Holuhraun, Iceland

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  Degassing mudpots at Hverarönd high temperature geothermal area, Krafla system, North Iceland

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  Degassing at Grand Prismatic Spring, Yellowstone National Park