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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.[1][2] Loud enough to be detected throughout the entire Pacific Ocean, Upsweep remains one of the only detected sounds to have an unresolved origin.[3] By 1996, early speculations that the sound originated from a biological source was dismissed.[a] The sound consists of a long train of narrow-band upsweeping sounds that occur in intervals of several seconds each. Upsweep occurs and changes seasonally, and is therefore speculated by NOAA scientists to originate from areas of underwater volcanic activity.
- ^ of California, the University (2003). "The Interspecies Newsletter". University of California. pp. 6–7. Retrieved September 15, 2024.
{{cite news}}: CS1 maint: url-status (link) - ^ "Acoustics Monitoring Program - Upsweep". www.pmel.noaa.gov. Retrieved 2024-09-15.
- ^ "Mysterious Sounds from the Deep | Deep Sea News". deepseanews.com. 2010-04-20. Retrieved 2024-09-16.
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