Application of a seismic network to baleen whale call detection and localization in the Panama basin-a Bryde's whale example.

Autor:	Tary JB; Departamento de Geociencias, Universidad de los Andes, Bogotá, Colombia.; Geophysics section, School of Cosmic Physics, Dublin Institute for Advanced Studies, Dublin, Ireland., Peirce C; Department of Earth Sciences, Durham University, Lower Mountjoy, South Road, Durham, DH13LE, United Kingdom., Hobbs RW; Department of Earth Sciences, Durham University, Lower Mountjoy, South Road, Durham, DH13LE, United Kingdom., Bonilla Walker F; Departamento de Geociencias, Universidad de los Andes, Bogotá, Colombia., De La Hoz C; Departamento de Geociencias, Universidad de los Andes, Bogotá, Colombia.; Department of Physics, University of Alberta, Edmonton, Canada., Bird A; Department of Earth Sciences, Durham University, Lower Mountjoy, South Road, Durham, DH13LE, United Kingdom., Vargas CA; Departamento de Geociencias, Universidad Nacional de Colombia, Bogotá, Colombia.
Jazyk:	angličtina
Zdroj:	The Journal of the Acoustical Society of America [J Acoust Soc Am] 2024 Mar 01; Vol. 155 (3), pp. 2075-2086.
DOI:	10.1121/10.0025290
Abstrakt:	Baleen whales use sounds of various characteristics for different tasks and interactions. This study focuses on recordings from the Costa Rica Rift, in the Eastern Tropical Pacific Ocean, made by 25 ocean-bottom seismographs and a vertical array of 12 hydrophones between January and February 2015. The whale calls observed are of two kinds: more commonly, repetitive 4-5 s-long signals separated into two frequency bands centered at ∼20 and ∼36 Hz; less commonly, a series of ∼0.5 to 1.0 s-long, lower amplitude signals with frequencies between 80 and 160 Hz. These characteristics are similar to calls attributed to Bryde's whales which are occasionally sighted in this region. In this study, the repetitive calls are detected using both the short-term average/long-term average approach and a network empirical subspace detector. In total, 188 and 1891 calls are obtained for each method, demonstrating the value of the subspace detector for highly similar signals. These signals are first localized using a non-linear grid search algorithm and then further relocalized using the double-difference technique. The high-resolution localizations reveal the presence of at least seven whales during the recording period, often crossing the instrument network from southwest to northeast. (© 2024 Acoustical Society of America.)
Databáze:	MEDLINE
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