Dictionary:Source-point gap

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{{#category_index:S|source-point gap}} The distance between the nearest geophone groups on opposite sides of the source point, which is often greater than the otherwise uniform geophone group spacing. Used so that the geophone groups that are nearest the source are far enough away that source-associated noise has little effect. Also used because the range of amplitudes to be recorded near the source point is much larger than that for offset geophones, thus lessening recording problems because of excessive range of amplitudes.