Earthquake activity beneath a volcano almost always increases before an eruption because magma and volcanic gas must first force their way up through shallow underground fractures and passageways. The continuous release of seismic energy is induced by the movement of magma. https://www.iris.edu/hq/inclass/animation/volcano_monitoring_volcanic_earthquakes | EarthScope Consortium
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Earthquake activity beneath a volcano almost always increases before an eruption because magma and volcanic gas must first force their way up through shallow underground fractures and passageways. The continuous release of seismic energy is induced by the movement of magma. https://www.iris.edu/hq/inclass/animation/volcano_monitoring_volcanic_earthquakes | EarthScope Consortium
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