Between the 21st and 23rd March 1998 measurements were made of the radiated underwater noise from the exploration drilling rig Ocean General, the rig tenders Pacific Ariki and Pacific Frontier maintaining position at the rig for supply purposes, the Pacific Ariki steaming at 11 knots and the fishing vessel Reef Venture steaming at 12 knots. Measurements were also taken of the local ambient noise with no vessel or rig noise input. The study region was 160 km NNW of the northern tip of Melville Island in the Timor Sea, in 110 m water depth 13 km inside the shelf edge 200 m depth contour.
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