Figure 2. (a) Vertical slice AA’ through seismic amplitude after structure-oriented median filtering showing three alternative horizon picks corresponding to autotracked troughs, zero-crossings (going from trough to peak), and peaks. Corresponding time-structure maps computed from picks of (b) peaks, (c) zero-crossings, and (d) troughs. All three time-structure maps exhibit less noise, though (b) and (d) exhibit a “patchy” appearance common to median filters. Data courtesy of Arcis Seismic Solutions, TGS.