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5 10 JO 50 100 roo 100 1.000 



Platform C 

 Water Depth: 180 ft. 

 HydroDhone Depth: 100 ft. 

 Distance: Average 50,200,200 ft. 



Tonal (Spectrum line) 

 ■^ Broad band (cont. spect.) 



Narrow band component 

 from chain clanking 

 of mooring buoy. 



Platform B 

 Water Depth: 180 ft. 

 Hydrophone Depth: 100 ft. 

 Distance: 100 ft. 



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Platform A 

 Water Depth: 180 ft. 

 Hydrophone Depth: 100 ft. 

 Distance: 100 ft. 



Fig. 6 Spectra of underwater noise of Platform C, Platform B and 



Platform A superimposed on average deep water ambient noise spectra 



F-18 



