1. . 
Often called statics, a bulk shift of a seismic trace in time during seismic processing. A common static correction is the weathering correction, which compensates for a layer of low seismic velocity material near the surface of the Earth. Other corrections compensate for differences in topography and differences in the elevations of sources and receivers.
See: base of weathering, brute stack, differential weathering correction, dynamic correction, elevation correction, first break, moveout, processing, receiver, source, velocity, weathered layer, weathering correction