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SOFAR channel. Underwater sound speed as a function of depth. Data derived from readings taken north of Hawaii in the Pacific Ocean and sourced from the World Ocean Atlas, 2005 edition. Note the SOFAR channel axis at ca. 750 m depth, where sound speed is shown at its lowest. The SOFAR channel (short for sound fixing and ranging channel), or ...
Seashell resonance refers to a popular folk myth that the sound of the ocean may be heard through seashells, particularly conch shells. This effect is similarly observed in any resonant cavity, such as an empty cup or a hand clasped to the ear. The resonant sounds are created from ambient noise in the surrounding environment by the processes of ...
Bloop was an ultra-low-frequency, high amplitude underwater sound detected by the U.S. National Oceanic and Atmospheric Administration (NOAA) in 1997. [1] By 2012, earlier speculation that the sound originated from a marine animal [2] was replaced by NOAA's description of the sound as being consistent with noises generated via non-tectonic ...
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 water may be in the ocean, a lake, a river or a tank. Typical frequencies associated with underwater acoustics are between 10 ...
Train. The Train is the name given to a sound recorded on March 5, 1997, on the Equatorial Pacific Ocean autonomous hydrophone array. The sound rises to a quasi-steady frequency. According to the NOAA, the origin of the sound is most likely generated by a very large iceberg grounded in the Ross Sea, near Cape Adare.
The swim bladders of large numbers of mesopelagic fishes cause sonar waves to be reflected in a recognisable layer. The deep scattering layer, sometimes referred to as the sound scattering layer, is a layer in the ocean consisting of a variety of marine animals. It was discovered through the use of sonar, as ships found a layer that scattered ...
Sound (geography) The Aldersund in Helgeland, Norway, separates the island of Aldra (left side) from the continent. In geography, a sound is a smaller body of water usually connected to a sea or an ocean. A sound may be an inlet that is deeper than a bight and wider than a fjord; or a narrow sea channel or an ocean channel between two land ...
Noise pollution, or sound pollution, is the propagation of noise or sound with ranging impacts on the activity of human or animal life, most of which are harmful to a degree. The source of outdoor noise worldwide is mainly caused by machines, transport and propagation systems. [ 1 ][ 2 ][ 3 ] Poor urban planning may give rise to noise ...