(hālz) 1. A graphical refraction interpretation method, particularly useful where the refractor changes depth markedly, such as where there is considerable relief or over large faults, but with constant velocity above the refractor. See Hales (1958) or Sheriff and Geldart (1995, 443–446). 2. A method for the Fourier-domain implementation of DMO (q.v.). See Hale (1984).