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- W1975511788 abstract "Offshore energy exploration and geophysical research activities using seismic airgun arrays are known to generate intense underwater sound. Such seismic imaging has the potential to impact marine mammals through hearing impairment and behavioral modification. Few studies have investigated multipath propagation and reverberation from these airgun impulses. These phenomena could increase the duty cycle within the sound field sufficiently to impact long distance communication or result in detrimental acoustic masking for marine mammals. We report initial findings on the elevation of the sound level between airgun impulses during a shallow, open-water seismic survey. This work uses continuous recordings collected from three bottom-mounted hydrophones deployed in the Beaufort Sea in summer 2012. A quantitative method is used to examine the root-mean-squared noise levels between seismic impulses and the noise level dependence on source range. Preliminary results show that ambient noise increases above non-impulsive harassment levels defined by the National Marine Fisheries Service (120 dB re: 1 microPa) for a portion of the time between seismic impulses at intermediate ranges from the source. In addition, the duration of reverberation is related to the source range, with significantly longer decay times measured on hydrophones at greater distances from the source." @default.
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- W1975511788 date "2013-11-01" @default.
- W1975511788 modified "2023-09-26" @default.
- W1975511788 title "Interpulse noise assessment during shallow water seismic survey using airgun excitations" @default.
- W1975511788 doi "https://doi.org/10.1121/1.4831101" @default.
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