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.

See related terms: distortion,  phase,  polarity standard,  Ricker wavelet,  wavelet