Upsweep is an unidentified sound detected on the American National Oceanic and Atmospheric Administration'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.

Urban Scale Shifts since the Bronze Age: Upsweeps, Collapses, and Semiperipheral Development
Polity scale shifts in world-systems since the Bronze Age: A comparative inventory of upsweeps and collapses
Comparing World-Systems: Empire Upsweeps and Non-core marcher states Since the Bronze Age
Cycles of Rise and Fall, Upsweeps and Collapses: Changes in the Scale of Settlements and Polities since the Bronze Age?
FINDING THE RIGHT HOLIDAY 'DO Expect to see sophisticated upsweeps, sparkling brooches and soft curls
A gel for upsweeps
Cycles of Rise and Fall, Upsweeps and Collapses
Basal forebrain stimulation changes cortical sensitivities to complex sound
Method for cascading sweeps for a seismic vibrator
Composite seismic signal