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A hydrophone can also detect airborne sounds but is insensitive of them because it is designed to match the acoustic impedance of water, a denser fluid than air. Sound travels 4.3 times faster in water than in air, and a sound wave in water exerts a pressure 60 times more than what is exerted by a wave of the same amplitude in air.
Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.
The first prototype of the 'geophone' was constructed by a Parisian instrument maker. Soon after, the instrument began gaining more renown and is now commonly known by the term ocean drum. The geophone was originally designed to replicate the sounds of dry and shifting earth; only later being applied to the sounds of the ocean.
The_Ocean_Hop_(1927).webm (WebM audio/video file, VP9, length 6 min 12 s, 640 × 478 pixels, 1.06 Mbps overall, file size: 46.8 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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Output of a computer model of underwater acoustic propagation in a simplified ocean environment. A seafloor map produced by multibeam sonar. Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries.
The sound's source was roughly triangulated to , a remote point in the South Pacific Ocean west of the southern tip of South AmericaThe sound was detected by the Equatorial Pacific Ocean autonomous hydrophone array, [1] a system of hydrophones primarily used to monitor undersea seismicity, ice noise, and marine mammal population and migration.
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