1. n. [Geophysics]

An adjustment of the relative positive and negative excursions of reflections during seismic processing by bulk shifting the null point, or baseline, of the data to emphasize peaks at the expense of troughs or vice versa. Some authors describe bias as a systematic distortion of seismic data to achieve greater continuity.

See related terms: baseline,  distortion,  processing,  trough,  zero crossing