Hardage et al. are to be commended for a thoughtful and valuable study on instantaneous frequency applied to reservoir characterization. Of particular note is the observation that anomalous instantaneous frequencies often correspond to lower seismic coherency and form interpretable patterns. This observation has an interesting background.

Anomalous values in instantaneous frequency commonly manifest themselves as frequency spikes, brief sharp excursions, positive or negative, of varying magnitude. Spikes are often considered a defect of the method. Indeed, a great attraction of average frequency (Taner et al., 1979) and response frequency (Bodine, 1986) is that they remove spikes....

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