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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.
A skyquake is a phenomenon where a loud banging sound is reported to originate from the sky. The sound may cause noticeable vibration in the ceiling or across a particular room. Those who experience skyquakes typically do not have a clear explanation for what caused them and they are perceived as mysterious.
[2] [3] There are various theories about the origin of the sound. One common explanation is that it was caused by the sound of waves, broken up by local topography, [1] but geological origins have also been proposed. [1] The sound is an example of a skyquake – an unexplained sudden loud sound without corresponding earthquake activity.
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Explore the Wikipedia category dedicated to unexplained phenomena, featuring a collection of mysterious events and occurrences.
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Freesound is a collaborative repository of Creative Commons licensed audio samples, and non-profit organisation, with more than 500,000 sounds and effects (as of May 2021), [1] and 8 million registered users (as of March 2019). Sounds are uploaded to the website by its users, and cover a wide range of subjects, from field recordings to ...