Natural and anthropogenic events influence the soundscapes of four bays on Hawaii Island

Last modified: 
November 2, 2017 - 11:21am
Type: Journal Article
Year of publication: 2017
Date published: 11/2017
Authors: Heather Heenehan, Sofie Van Parijs, Lars Bejder, Julian Tyne, Brandon Southall, Hugh Southall, David Johnston
Journal title: Marine Pollution Bulletin
Volume: 124
Issue: 1
Pages: 9 - 20
ISSN: 0025326X

The soundscapes of four bays along the Kona Coast of Hawaii Island were monitored between January 2011 and March 2013. Equivalent, unweighted sound pressure levels within standard 1/3rd-octave bands (dB re: 1 μPa) were calculated for each recording. Sound levels increased at night and were lowest during the daytime when spinner dolphins use the bays to rest. A tsunami provided an opportunity to monitor the soundscape with little anthropogenic component. We detected a decrease in sound levels and variability in one of the busiest bays. During the daytime in the 3.15 kHz 1/3rd octave band, we detected 92 loud outliers from vessels, aquaculture, and military mid-frequency active sonar. During one military mid-frequency active sonar event sound levels reached 45.8 dB above median ambient noise levels. The differences found in the bays illustrate the importance of understanding soundscapes to effectively manage noise pollution in marine ecosystems.

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