The problem of extracting a mixed-delay source wavelet from a point-source seismogram for an acoustic, horizontally stratified medium (bounded by a free surface above and a half-space below or between two half-spaces) can be completely solved without any further assumptions about the source pulse or the model parameters. The solution relies on information contained in the so-called evanescent part of the point-source seismogram, which can be extracted via a plane-wave decomposition, i.e., by a transformation of the point-source seismogram from the time-space domain into the frequency-rayparameter domain.

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