Figure 2. (a) Segment of an inline through the input 3-D seismic amplitude and corresponding 65 Hz, (b) spectral magnitude, (c) spectral phase, and (d) spectra voice volumes. Notice the vertical discontinuities in the highlighted portion are poorly seen in the original broadband data; are not seen in the spectral magnitude component; but are clearly seen in the spectral phase and voice components. The voice component has the advantage in that it can easily be interpreted and processed (e.g. using coherence) as one would the original seismic amplitude data.