Harmonic tremor is a type of seismic activity often associated with volcanic eruptions. It is characterized by continuous, rhythmic ground vibrations that occur at low frequencies and can be detected by seismometers. Unlike regular earthquakes, which are typically caused by tectonic movements, harmonic tremor is primarily related to the movement of magma within a volcano. The presence of harmonic tremor indicates that there is a flow of magma moving through the earth, which can suggest that an eruption may be imminent.
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