Volcanic Tremor 2
Volcanic Tremor 2 : Seismic signals which are generated by volcanic activity and highly variable in character, ranging from those indistinguishable from tectonic earthquakes to continuous vibrations with relatively low frequencies (0.5-5 Hz). The continuous vibrations are known as volcanic, or harmonic, tremors and likely caused by the involvement of gas-fluid interaction. Harmonic tremors have a very uniform appearance, whereas spasmodic tremors are pulsating and consist of higher frequencies with a more irregular appearance. See McNutt (2002)
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