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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.
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In the case of Kokomo, Indiana, a city with heavy industry, the origin of the hum was thought to have been traced to two sources. The first was a 36 Hz tone from a cooling tower at the local DaimlerChrysler casting plant and the second was a 10 Hz tone from an air compressor intake at the Haynes International plant. [ 21 ]
The Yowie howls emitted from a forested area near the town of Monroe and lasted up to 10 terrifying minutes, according to the witness. ... it was a sound-only report — but a probe found the ...
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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 .
• NA, United States; Puget Sound near Maury Island, Washington: Fred Crisman mailed an account from employee Harold A. Dahl, along with a cigar box of metal wreckage, to Raymond A. Palmer who had previously published the Shaver Mystery stories. Dahl claimed that his dog was killed and his son was injured by debris in an encounter with six ...