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Next: Appendix B Up: Farghal and Levin: Aligning Previous: Appendix A

Fractional shifts

By first taking the seismograms to the Fourier domain, padding with zeros with a certain factor (interleaving), we obtain fractional shifting. This is because the sampling interval is reduced by that factor, which we call super-sampling of data. Then, we apply the receiver-by-receiver alignment program to align all multiplets with the master seismogram reflection, as will be discussed in the coming section. Fractional shifting does not change a seismogram visually, but it multiplies its sampling density.