Ambient Noise Measurements Off the West Coast of Mexico and Central America,
NAVY ELECTRONICS LAB SAN DIEGO CALIF
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Operation SHUTTLE was conducted by NEL off the west coast of Central America during the summer of 1952. Its primary objectives were to make oceanographic measurements of 1 offshore waters around uninhabited islands, 2 a seamount, and 3 deep water in open sea. However, since the cruise was being conducted in areas free of sources of man-made noise, it appeared an excellent opportunity to extend previous knowledge of ambient noise at slight added cost. In the absence of man-made interference, acoustic measurements could be made to determine the frequency spectrum of ambient background noise as caused by variations of natural parameters, including sea state, water depth, proximity to shore, and time of day. Levels of ambient noise, determined in octave bands from 50 to 4800 cps, could be compared with previously published data.