Seismic survey sound propagation: a Porcupine Basin noise-field

Abstract:Anthropogenic noise in the ocean's water column, including from offshore seismic surveys, is ever increasing, bringing greater ecological pressure on the marine environment and with that a need to measure, understand and mitigate against these sources of noise pollution. Here, a previous study on an offshore seismic survey along the Irish continental margin is utilised to gain further insight into sound propagation in this sensitive area for marine mammals. Propagation pathways, along with seasonal variability and modelled slope conditions are investigated to constrain sound levels relative to those that can cause harm. Results are discussed in the context of noise pollution in the Porcupine Basin (e.g. geoacoustic and environmental parameters, including slope angle, topography, seasonality and the water column). Acoustic model functionality is assessed. Noise exposure criteria and behavioural disturbance to marine mammals are considered alongside regulatory frameworks, with the future aim of increasing Ireland's capacity to limit the effects of ocean noise pollution.