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{{#category_index:U|undershooting}} Seismic surveying using a source on one side of an obstacle or property into a spread on the opposite side in order to obtain subsurface coverage under the obstacle or property itself. Used when the surface of the property is inaccessible (such as on a line crossing a river) or to get data beneath some feature whose presence might introduce intolerable uncertainties if measured through it (such as to map beneath a salt dome).