HIGH-RESOLUTION MARINE REFLECTION PROFILING FOR ENGINEERING AND ENVIRONMENTAL PURPOSES .A. ACQUIRING ANALOG SEISMIC SIGNALS

The success of any application of high-resolution seismic profiling, w hether done on land or water, depends on a sequence of activities that starts with preplanning and extends through processing and presenting the data. If optimum results are to be achieved, each element of the sequence must be performed carefully. This paper discusses technical e lements associated with acquiring the analogue signal in as good a for m as possible. The introductory remarks concern marine seismic profili ng in general but further discussion concentrates on single-channel hi gh-resolution methods. Basic types of marine energy sources are review ed. Receivers are discussed and the design of hydrophone arrays relati ve to water depth is explained. Optimum source-receiver geometry and t echniques for improving signal-to-noise ratio in the field are discuss ed in detail. The use of frequency filtering and electronic amplificat ion are also discussed.