11/11/2023 0 Comments HyperSnap 7.29![]() ![]() Lateral variations in the near-surface soil layers can affect amplitudes thereby causing "amplitude statics". The use of finite XY values improves the resolution of lateral variations in both amplitudes and time-depths. The RCS can also include a separation between each pair of forward and reverse traces in order to accommodate the offset distance in a manner similar to the XY spacing of the GRM. The convolved amplitudes or the equivalent shot amplitude products can be useful in resolving ambiguities in the determination of wavespeeds. The head coefficient is approximately proportional to the ratio of the specific acoustic impedances in the upper layer and in the refractor, where there is a reasonable contrast between the specific acoustic impedances in the layers. The signal-to-noise (S/N) ratios of the RCS show much less variation than those on the original shot records. ![]() To a good approximation, this operation compensates for the large effects of geometric spreading, with the result that the convolved amplitude is essentially proportional to the square of the head coefficient. Convolution also multiplies the amplitudes of first arrival signals. The convolution operation effectively adds the first arrival traveltimes of each pair of forward and reverse traces and produces a measure of the depth to the refracting interface in units of time which is equivalent to the time-depth function of the generalized reciprocal method (GRM). The RCS is generated by the convolution of forward and reverse shot records. The RCS advances the interpretation of shallow seismic refraction data through the inclusion of time structure and amplitudes within a single presentation. It is a simple and efficient approach to full trace processing which generates a time cross-section similar to the familiar reflection cross-section. The refraction convolution section (RCS) is a new method for imaging shallow seismic refraction data. ![]()
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