1. n. [Geophysics]

A technique for acquiring seismic refraction data around local, high-velocity features such as salt domes by using a fan or arc-shaped geophone array around a central shotpoint. The data from the fan-shaped array are calibrated against a control profile acquired some distance from the anomalous feature.

See related terms: anomaly,  calibration,  geophone array,  radial refraction,  salt dome