Abstract
Observations made in boreholes for the purpose of solving structural problems were initiated as far back as the thirties using a borehole geophone method to study the flanks of salt domes. This method involves the positioning of the borehole geophone below the refracting interface and recording the waves arriving from shotpoints located on the surface. In the case of a high-dip interface with a sharp velocity differentiation, processing of the observed data with the aid of the time field enables the refracting interface in the section contiguous with the borehole to be mapped. However, the method has not become widespread, because it utilizes only the first arrivals of the transmitted waves.
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