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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.
Pages in category "Unidentified sounds" The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes. ...
Upsweep is an unidentified sound detected by the U.S. National Oceanic and Atmospheric Administration's (NOAA) equatorial autonomous hydrophone arrays. The sound was recorded in August, 1991, using the Pacific Marine Environmental Laboratory's underwater sound surveillance system, SOSUS .
The sound was detected at 2am local time by a Canadian P-3 aircraft. It first came every 30 minutes and was heard again four hours later, the internal government memo obtained by CNN states.
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Two Lebanon County Game Wardens found the girl's remains on Oct. 10, 1973, in a wooded area in Lebanon County, according to PSP Tips, part of the Pennsylvania State Police Department.
[10] Wolman reported in his article the following: Fox's hunch is that the sound nicknamed Bloop is the most likely (out of the other recorded unidentified sounds) to come from some sort of animal, because its signature is a rapid variation in frequency similar to that of sounds known to be made by marine beasts.
Weather: Distant thunder, or loud sounds from wind damage. Atmospheric ducting of distant thunder or other loud sounds from far off. ("Ducting" is enhanced propagation of sound or radio waves over long distances, through the troposphere, by wave travel that's constrained between distinct air layers.) [9]