Volcanic gas

Volcanic gases are gases given off by active (or, at times, by dormant) volcanoes. These include gases trapped in cavities (vesicles) in volcanic rocks, dissolved or dissociated gases in magma and lava, or gases emanating from lava, from volcanic craters or vents. Volcanic gases can also be emitted through groundwater heated by volcanic action.

Volcanic gases entering the atmosphere with tephra during eruption of Augustine Volcano, Alaska, 2006
Sketch showing typical carbon dioxide emission patterns from volcanic and magmatic systems
Schematic of volcanic eruption
Vog in Hawaii, Kilauea 2008 eruptions
Lava fountains at Holuhraun
Eruption columns of mixed eruption at Holuhraun, Iceland, in 2014
Average carbon dioxide (CO2) emissions of subaerial volcanoes globally from the time period of 2005 to 2017
Degassing lava field, Holuhraun, Iceland
Degassing at the summit crater of Villarrica, Chile
Degassing mudpots at Hverarönd high temperature geothermal area, Krafla system, North Iceland
Degassing at Grand Prismatic Spring, Yellowstone National Park

The sources of volcanic gases on Earth include:

Substances that may become gaseous or give off gases when heated are termed volatile substances.

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This article uses material from the Wikipedia article Volcanic gas, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.