Thus, in summarv, the one system hest approaching the specification 

 delineated in Appendix A is, in the author's opinion, the large-transducer 

 Edo-Western Model 400 3.5 kHz system. In lieu of using this system, it is 

 suggested that (1) for continental shelf depths, a small-transducer 3.5 

 kHz high-resolution system plus the sparker be used, and (2) for depths 

 greater than 600 feet, the High Resolution Roomer™, Edo-Western Large- 

 Transducer Model 400, or like, plus the sparker be utilized. 



Much of the compromise between penetration and resolution in deep 

 water discussed here can be obviated by deep-towing a small-transducer, 

 3.5 kHz, piezoelectric sound source near the seafloor. 



Surveys of this type have been limited to special applications requir- 

 ing high resolution in oceanic depths, or the location of buried objects 

 in deep water. The initial cost on such equipment is modest and, although 

 sea operations are slow, very high resolution (0.5 m) and good penetration 

 (>100 feet) of the unconsolidated sediment column in deep (>6,000 feet) 

 water is provided. 



Both Edo-Western and Ocean Research Enuipment (ORE) Companies, for 

 example, provide components for deep-towed, or submersible-mounted appli- 

 cation. The REACON site's seismic reflection profiler survey was provided 

 by a 5 kHz submersible-mounted system. 



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