PMEL Acoustics Program logo National Oceanic and Atmospheric Administration Pacific Marine Environmental Laboratory Acoustics Program

earthquake spectrogramTypically, an earthquake produces a triangular-shaped signal on a spectrogram, (with the highest acoustic energy yellows and reds), occurring in the 5 to 30 Hz frequency range.


Click here (285 kb, 10x) to hear the sound produced by this earthquake. (Note: the bird like sounds that you hear in the background are actually humpback calls at ten times their normal speed!)