Japan quake sound recorded underwater microphones (or "Hydrophones")

Japan quake sound recorded by underwater microphones (or "Hydrophones") Xeni Jardin at 2:16 am Friday, Apr 15, 2011

[Video link]. An AP element of spectrograms and audio files, the sound waves associated with the March 11 earthquake off the northern coast of Japan captured. (via @ NYTjim)

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