Harmonic tremors are indicative of magma moving beneath the surface and may be significant for forecasts of volcanic activity.

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Harmonic tremors are a type of continuous, rhythmic seismic event typically associated with the movement of magma beneath the surface of a volcano. Their detection is significant for volcanologists as they can indicate that a volcano is becoming more active and may erupt, thus playing a crucial role in forecasting volcanic activity.

Harmonic Tremors Are Indicative of Magma Moving Beneath the Surface