An earthquake in a volcanically active area with an origin different from that of a tectonic earthquake.

Possible origins include the modification of regional stress by magma, volcanic eruption, the oscillation of liquid and/or gas in a magma chamber and magma flow in conduits compressed by hydrostatic pressure.

In the most common form, a volcanic earthquake usually accompanies a volcanic eruption. The earthquake preceeding or following an eruption is usually a form of pressure release. Occasionally, it is the result of magma eroding structural bedrock and causing a weakness in the surrounding earth.

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