Article ID Journal Published Year Pages File Type
5757954 Marine Pollution Bulletin 2017 12 Pages PDF
Abstract
Marine Vibroseis (MV) may provide a marine seismic sound source that has less environmental impact than conventional airguns. Modelled sound levels from a realistic MV array and airgun array with similar downward energy at frequencies < 100 Hz were compared under three scenarios: shallow, deep, and slope. Changing the layout of the MV array's higher frequency sources reduced sound exposure levels (SELs) by 4 dB. At 100 m range this MV was 20 dB lower in peak-to-peak sound pressure level vs. the airgun array, decreasing to 12 dB lower at 5 km, the maximum modelled range for peak levels. SELs were less clear-cut, but for both shallow and deep water, MV produced 8 dB lower SELs than the airguns at 100 km range because of MV's reduced bandwidth. Overall, MV produced lower broadband SELs, especially at long range, and lower peak pressure, especially at short range, than airguns.
Related Topics
Physical Sciences and Engineering Earth and Planetary Sciences Oceanography
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