An official website of the United States government
Passive acoustic monitoring was conducted in the Navy’s Southern California Range Complex from April 2021 to May 2022 to detect marine mammal and anthropogenic sounds. High-frequency Acoustic Recording Packages (HARPs) recorded sounds between 10 Hz and 100 kHz at four locations: one site west of San Nicolas Island (1,100 m depth, site SN), two sites west of San Clemente Island (1,300 m depth, site E and 1,200 m depth, site H), and one site southwest of San Clemente Island (1,300 m depth, site N). With the offshore expansion of the SOCAL range, site SN was added into the monitoring effort for this reporting period to improve noise monitoring for the region.