No Audio: The animation shows how sound waves, emitted by an energy source towed beneath a boat, are reflected off substrates at depth and are recorded and interpreted by seismologists. Seismologists collect data as sound and seismic waves are transmitted through the Earth and reduce the data to 'squiggles'. They interpret the images to see changes in rock layers at depth.
This animation from a collection of New Madrid seismic-zone animations:
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