Slicing through a 3D data volume along a curved surface parallel to a fault plane. Because data are usually distorted when very near a fault, fault slices are made a short distance (perhaps 50–100 m) on either side of the fault, resulting in footwall and hanging-wall slices. These are then projected into vertical sections to indicate splinter faulting or closure against the fault. Footwall and hanging-wall slices are often superimposed to indicate sealing against the fault; see fault seal analysis. See Brown (1999, 20–22, 225–232) and Figures F-5 and T-5.