Earthquake
Typically,
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!)
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