The assessment of underwater noise has been of increasing importance in recent years and this has coincided with a raised awareness of the levels of underwater noise from shipping and other marine activities [1-3] and the potential it has for impact on marine life, leading to the recent development of impact criteria [4-6]. These man-made noises have the potential for greater impacts on marine fauna in shallow water regions, where sound intensity decreases at a slower rate with range from a source. It is desirable to determine the source levels of these noises so the data can be used for better management of noise exposure.
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