The present invention provides a method and apparatus for arriving at truerelative amplitude destretched seismic traces from stretched seismic traces.The method compensates for offset varying reflection interference effects dueto normal moveout. Stretch factors .beta. and also input spectra aredetermined for NMOR stretched seismic traces. Estimates are then made ofstretched wavelet spectra from the input spectra. A destretched waveletspectra is then obtained. Shaping correction factors are determined by takingthe ratio of the destretched wavelet spectra to the stretched wavelet spectraand are applied to the input spectra of the stretched traces to arrive at adestretched trace spectra. True relative amplitude scaling factors arecomputed by taking the ratio of a true relative amplitude property of thedestretched wavelet spectra to a corresponding true relative amplitudeproperty of the stretched wavelet spectra. Finally, the true relativeamplitude scaling factors are applied to the destretched trace spectra toarrive at true relative amplitude destretched seismic traces.
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