This paradoxical title is in fact a tribute to the classic paper by Gibson and Larner, “Predictive deconvolution and the zero-phase source” (Geophysics, 1984). Their work was originally presented at the 1982 SEG Annual Meeting, which means that it has been almost 20 years since they exposed the problems associated with controlling the phase of vibroseis records, and we are still struggling with them. The main issue is not related to the zero-phase Klauder wavelet itself but rather with the rest of the recording chain which contains a series of minimum-phase filters (such as the geophone response and...

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