Sounds from airguns and fin whales recorded in the mid-Atlantic Ocean, 1999–2009

  • Nieukirk S
  • Mellinger D
  • Moore S
 et al. 
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Between 1999 and 2009, autonomous hydrophones were deployed to monitor seismic activity from 16 N to 50 N along the Mid-Atlantic Ridge. These data were examined for airgun sounds produced during offshore surveys for oil and gas deposits, as well as the 20Hz pulse sounds from fin whales, which may be masked by airgun noise. An automatic detection algorithm was used to identify airgun sound patterns, and fin whale calling levels were summarized via long-term spectral analysis. Both airgun and fin whale sounds were recorded at all sites. Fin whale calling rates were higher at sites north of 32 N, increased during the late summer and fall months at all sites, and peaked during the winter months, a time when airgun noise was often prevalent. Seismic survey vessels were acoustically located off the coasts of three major areas: Newfoundland, northeast Brazil, and Senegal and Mauritania in West Africa. In some cases, airgun sounds were recorded almost 4000km from the survey vessel in areas that are likely occupied by fin whales, and at some locations airgun sounds were recorded more than 80% days/month for more than 12 consecutive months.

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  • Sharon L. Nieukirk

  • David K. Mellinger

  • Sue E. Moore

  • Karolin Klinck

  • Robert P. Dziak

  • Jean Goslin

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