Volcanic gas

Volcanic gases entering the atmosphere with tephra during eruption of Augustine Volcano, Alaska, 2006

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.

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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