1. . 
An appearance of seismic data as a diffraction, reflection, refraction or other similar feature produced by an arrival of seismic energy. An event can be a single wiggle within a trace, or a consistent lining up of several wiggles over several traces. An event in a seismic section can represent a geologic interface, such as a fault, unconformity or change in lithology.
See: abnormal events, attenuate, bow tie, character, coherence filtering, dim spot, interval time, isochron map, lag, long-path multiple, multiple reflection, peg-leg multiple, phantom, pick, primary reflection, processing, seismic section, short-path multiple, sideswipe, signature, smile, space frequency domain, tuning effect