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ACOUSTIC WAVES ALONG OILFILLED STREAMER CABLES *
- Source: Geophysical Prospecting, Volume 21, Issue 2, Apr 1973, p. 281 - 295
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- 27 Apr 2006
Abstract
There are different types of acoustic noise induced in streamer cables. One type consists of pulsed waves preferentially generated by vertical motions of the towing ship or of the tail buoy. The pulsed waves travel along the streamer with low attenuation and a velocity about 15% less than the velocity of water. Frequencies observed lie between 5 and 15 Hz.
These pulsed waves are well known and for the last few years acoustic isolator sections have been used to reduce their generation. But under bad weather conditions and especially in cold water these waves become stronger. Recent investigations demonstrated that the pulsed waves are able to produce a high noise level even in new streamers with acceleration cancelling hydrophones. We point out that the material of the hoses has a dominant effect on the amplitude picked up by the hydrophones.
Acoustic theory is applied to understand the phenomenon of these waves.