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{{#category_index:S|smear}} 1. To mix (stack together) data that are not in complete register. 2. To average seismic data originating from sources at different locations, or recorded by geophones at different locations, or both; a consequence of ground mixing. The data from several shots or other source impulses often are combined without any time adjustment by vertical stacking, especially with surface sources. The amount of smear is the distance over which the sources are located plus the distance over which the geophones feeding one channel are planted. 3. The effect of stacking common-midpoint traces for a dipping reflector, because the reflecting point is not common. Remedied by DMO processing. See Figure C-9b.