SOFAR
SOFAR : Sound Fixing and Ranging, a triangulation technique based on the mode of travel of sound waves underwater. Sounds created in deep ocean waters (e.g., by an explosion or an earthquake) move great distances with little attenuation. Land-based listening stations in several different locations that receive such sound signals can then pinpoint their origin. T-phases from tsunamigenic earthquakes travel readily through the SOFAR channel
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