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What is volcanic tremor, and how does it differ from earthquakes?

April 26, 2017differ earthquakes tremor Volcanic

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What is volcanic tremor, and how does it differ from earthquakes?

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Tremor is a seismic vibration, similar to a volcanic earthquake, but of longer duration and more continuous than earthquakes of the same amplitude. Volcanic tremor can last from minutes to days. It may be caused by magma moving through narrow cracks, boiling and pulsation of pressurized fluids within the volcano, or escape of pressurized steam and gases from fumaroles.