The use of least-mean-square-error single and multichannel linear filtering for the reversal of signal alteration resulting from the seismic propagation path provides useful results in earthquake analysis and exploration seismology. The importance of the dispersive normal modes of propagation in layered elastic media and the time invariance of the seismic propagation medium are important, unique features of the seismic problem which contribute to the usefulness of this type of signal processing. Examples from exploration and earthquake seismology illustrate the techniques.

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