A modelling comparison between received sound levels produced by a marine Vibroseis array and those from an airgun array for some typical seismic survey scenarios. Issue 1 (15th June 2017)

• Record Type: Journal Article
• Authors: Duncan, Alec J.; Weilgart, Linda S.; Leaper, Russell; Jasny, Michael; Livermore, Sharon
• Is Part Of: Marine pollution bulletin. Volume 119:Issue 1(2017)
• Page Start: 277
• Page End: 288
• Publication Date: 2017-06-15
• Subjects: Marine Vibroseis -- Marine vibrator -- Seismic survey -- Airgun alternative -- Quieting technology -- Noise; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2017.04.001
• Languages: English
• ISSNs: 0025-326X

Abstract

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. Highlights: Modelled sound levels from marine Vibroseis (MV) and airgun arrays were compared. MV produced lower sound exposure levels than airguns, especially at long range. MV produced lower peak pressure than seismic airguns, especially at short range. MV may thus be a less environmentally impactful alternative to seismic airguns.