Passive acoustics

Passive acoustics is the action of listening for sounds, often at specific frequencies or for purposes of specific analyses. It is often used for passive acoustic monitoring (PAM), the act of recording animal and environmental sounds through the use of acoustic sensors for the purpose of tracking animals and answering other ecological questions.

PAM has risen as a valuable method for a variety of queries relating to conservation, applied and behavioral ecology, and biodiversity.^[1] There are a variety of tools and machinery available for monitoring in both terrestrial and aquatic environments. This method of ecological monitoring is especially valuable for species that vocalize and are hard to observe visually.^[1] Passive acoustic monitoring also allows for observation across spatial and temporal scales previously unseen due to the limitations of data collection.^[1]

As applied to underwater acoustics, also termed hydroacoustics, passive acoustics can be used to listen for underwater explosions, earthquakes, volcanic eruptions, sounds produced by fish and other marine animals, vessel activity or aquatic detecting equipment (as in hydroacoustics to track fish).

References

^ ^a ^b ^c Ross, Samuel R. P.-J.; O'Connell, Darren P.; Deichmann, Jessica L.; Desjonquères, Camille; Gasc, Amandine; Phillips, Jennifer N.; Sethi, Sarab S.; Wood, Connor M.; Burivalova, Zuzana (April 2023). "Passive acoustic monitoring provides a fresh perspective on fundamental ecological questions" (PDF). Functional Ecology. 37 (4): 959–975. doi:10.1111/1365-2435.14275. ISSN 0269-8463.

David A. Mann, Anthony D. Hawkins, and J. Michael Jech, Active and Passive Acoustics to Locate and Study Fish, from book Fish Bioacoustics: With 81 Illustrations (pp.279-309), April 2008
Marco Brunoldi, Giorgio Bozzini, et al., A Permanent Automated Real-Time Passive Acoustic Monitoring System for Bottlenose Dolphin Conservation in the Mediterranean Sea, 2016

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[:0-1] Ross, Samuel R. P.-J.; O'Connell, Darren P.; Deichmann, Jessica L.; Desjonquères, Camille; Gasc, Amandine; Phillips, Jennifer N.; Sethi, Sarab S.; Wood, Connor M.; Burivalova, Zuzana (April 2023). "Passive acoustic monitoring provides a fresh perspective on fundamental ecological questions" (PDF). Functional Ecology. 37 (4): 959–975. doi:10.1111/1365-2435.14275. ISSN 0269-8463.

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v t e Hydroacoustics
Sonar	Active acoustics Baffles (submarine) Bistatic sonar Echo sounding Fessenden oscillator GLORIA sidescan sonar Multibeam echosounder Passive acoustics Scientific echosounder Side-scan sonar Sonar beamforming Sonobuoy Surveillance Towed Array Sensor System Synthetic aperture sonar Towed array sonar Upward looking sonar
Ocean acoustics	Acoustic network Acoustic release Acoustic Doppler current profiler Acoustic seabed classification Acoustical oceanography Hydrophone Long baseline acoustic positioning system Ocean acoustic tomography Short baseline acoustic positioning system Sofar bomb SOFAR channel Sound speed gradient Sound velocity probe Ultra-short baseline acoustic positioning system Underwater acoustics Underwater acoustic communication Underwater acoustic positioning system
Acoustic ecology	Acoustic survey in fishing Acoustic tag Animal echolocation Beached whale Deep scattering layer Fishfinder Fisheries acoustics Hearing range of marine mammals Marine mammals and sonar Whale song
Related topics	Acoustic signature Bioacoustics Biophony Geophysical MASINT Hydrographic survey Noise map Soundscape