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.
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