RESDYK - A FORTRAN PROGRAM FOR COMPUTING APPARENT RESISTIVITY OVER AN INFINITELY DEEP OUTCROPPING VERTICAL DIKE

An interactive FORTRAN IV main program "RESDYK" is given for computing apparent resistivity values resulting from a general collinear four electrode configuration oriented perpendicular to an infinitely deep, outcropping, vertical dike. The program makes use of generalized expressions for the anomalous potential so that media on either side of the dike may have different resistivities. In addition, the thickness of the dike may be small or large compared to the electrode separation. Subroutine "PROCESS" computes the potential for a two electrode (one current and one potential) configuration. By suitably combining four such potentials, the apparent resistivity which is the result of a general collinear four electrode configuration is computed by RESDYK. The results also can be expressed in a nondimensional form, convenient for preparing libraries of master curves. Test runs are appended.