Dictionary:Radial refraction

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{{#category_index:R|radial refraction}} 1. A pattern of surveying somewhat comparable with fan shooting (q.v.). 2. Use of a detector deep in a borehole to receive and record seismic waves from sources located near the ground surface at different distances and azimuths. Used in determining salt-dome boundaries. Travel paths that are partly in salt show a lead that depends on the amount of salt travel. See Figure A-15.