zero phase

Display of acoustic impedance, traces, well logs and a zero-phase wavelet
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1. adj. [Geophysics]
Pertaining to seismic data whose wavelet is symmetrical about zero time. Deconvolution during seismic processing can convert data of mixed phase to zero-phase data, but is not always successful. Zero-phase data tend to provide sharper definition and less distortion between stratigraphic features in the subsurface, such as sand and shale layers.