An official website of the United States government
Passive acoustic monitoring was conducted in the Navy’s Southern California Range Complex from November 2018 to May 2020 to detect marine mammal and anthropogenic sounds. High-frequency Acoustic Recording Packages (HARPs) recorded sounds between 10 Hz and 100 kHz at four locations: two west of San Clemente Island (1,300 m depth, site E and 1,000 m depth, site H) and two southwest of San Clemente Island (1,250 m depth, site N and 1,200 m depth, site U).