Abstract
Wideband sound recordings were made of underwater noise emitted by an active drillship, Stena Forth, working in 484m of water in Baffin Bay, western Greenland. The recordings were obtained at thirty and one-hundred meters depth. Noise was recorded during both drilling and maintenance work at ranges from 500m to 38km. The emitted noise levels were highest during maintenance work with estimated source levels up to 190dB re 1μPa (rms), while the source level during drilling was 184dB re 1μPa (rms). There were spectral peaks discernible from the background noise to ranges of at least 38km from the drillship with the main energy below 3kHz. M-weighted sound pressure levels were virtually identical to broadband levels for low-frequency cetaceans and about 5dB lower for high-frequency cetaceans. Signals from the dynamic positioning system were clearly detectable at ranges up to two km from the drillship.
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