Harmonic Tremor

Harmonic tremor is a continuous, rhythmic vibrations in the Earth's crust caused by the movement of magma beneath a volcano. Unlike typical earthquakes, which are sudden and unpredictable, harmonic tremor produces a steady, resonant sound or signal detectable by seismometers. It indicates that magma is actively moving and can signal an impending eruption. These signals are characterized by their consistent frequency and amplitude, helping scientists monitor volcanic activity and assess eruption risks with more confidence.