Prior, M K; Ainslie, M A; Halvorsen, M B; Hartstra, I; Laws, R M; MacGillivray, A; Muller, R; Robinson, S; Wang, L (2021) Characterization of the acoustic output of single marine-seismic airguns and clusters: the Svein Vaage dataset. Journal of the Acoustical Society of America, 150 (5). pp. 3675-3692.

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Abstract

The acoustical output of marine-seismic airguns is determined from recordings of sound pressure made on hydrophones suspended below a floating barge from which the airguns are also deployed. Signals from multiple types of airgun are considered and each type is operated over a range of deployment depths and chamber pressures. The acoustical output is characterized in terms of a ‘source waveform’ with dimensions of pressure-times-distance and, in an infinite idealized medium, could be divided by source-receiver distance to give the sound pressure at that receiver. Sources are further characterized by metrics such as the peak-source-waveform and the energy source level. These metrics are calculated in several frequency bands so that the resulting metrics can be used to characterize airguns in term of their utility for seismic image-processing or in terms of their possible effects on marine life. The source characterizations are validated via comparisons of acoustic pressure measured on far-field hydrophones and predicted using the source waveforms. Comparisons are also made between empirically derived expressions relating acoustic metrics to chamber volume, chamber pressure, and deployment depth and similar expressions from the literature.

Item Type:	Article
Keywords:	acoustic seismic airgun geophysical survey
Subjects:	Acoustics > Underwater Acoustics
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.1121/10.0006751
Last Modified:	12 Jan 2022 15:46
URI:	http://eprintspublications.npl.co.uk/id/eprint/9314

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