Accession Number : AD0712520

Title :   TOWED SEISMIC ARRAY NOISE MEASUREMENTS,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON D C INST OF OCEAN SCIENCE AND ENGINEERING

Personal Author(s) : Gilheany,John J. ; Blomquist,Donald S. ; Krause,John K.

Report Date : SEP 1970

Pagination or Media Count : 26

Abstract : The noise environment encountered by a seismic hydrophone array towed astern of the oceanographic research vessel, U.S.N.S. Lynch (T-AGOR-7), was investigated as a function of cable scope (200, 400, and 800 feet) and towing speed (about 2, 5, 8, 10, and 12 knots). Third octave analysis (25 to 1000 Hz) is presented. Some spectral lines are investigated by 6% analysis. The expected decrease in noise level with increasing cable scope and decreasing speed was not observed when the array passed from the seasonal thermocline into the layer. (Author)

Descriptors :   (*HYDROPHONES, CAVITATION NOISE), (*ECHO RANGING, INTERFERENCE), OCEANOGRAPHIC SHIPS, TOWED BODIES, PHASED ARRAYS, VELOCITY, ATTENUATION, THERMOCLINES

Subject Categories : Physical and Dynamic Oceanography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE