| Abstract: | The earth's surface can be an effective means of generating converted pS-waves. Due to their nearly symmetrical ray path, conventional processing techniques can be used. As the wave is generated by reflection at the surface or at the base of surface layers one can expect a general filtering effect in the data for individual ray paths of a single shot gather. To balance the spectra of the traces a multiple-trace filter was used. This filter can be fully determined in the time domain using the prediction-error operators of the individual traces. The preferred mean spectrum to colour the traces was the geometric mean. As the process of spectral balancing requires a minimum-delay wavelet, the recording instrument was replaced by its corresponding minimum-phase equivalent. This process can also be carried out effectively in the time domain. Results of the application of minimum-delay transform and spectral balancing are discussed for single shot gathers and for the general improvement of the final stack. |
