On a modern microcomputer, the inversion of a single pseudosection is usually completed within seconds to minutes. Four different techniques for topographic modelling are available in this program. Together with the free 2D forward modeling program RES2DMOD, it forms a complete 2D resistivity forward modeling and inversion package. The program will automatically choose the optimum inversion parameters for a particular data set. However, the parameters which affects the inversion process can be modified by the user.

The smoothing filter can be adjusted to emphasize resistivity variations in the vertical or horizontal directions. Two different variations of the smoothness constrained least-squares method are provided one optimised for areas where the subsurface resistivity varies in a smooth manner (such as chemical plumes), and another optimised for areas with sharp boundaries (such as massive ore bodies).

A robust data inversion option is also available to reduce the effect of noisy data points. Resistivity information from borehole and other sources can also be included to constrain the inversion process. The complex resistivity method (Kenma, A., Binley, A., Ramirez, A. Complex resistivity tomography for environmental applications. Chemical Engineering Journal, 77, 11-18.) is used for IP data inversion. The figure below shows an example from an electrical imaging survey in an area with fairly complex subsurface geology and significant surface topography. This survey was carried out across a circular mound which is thought to contain some important Irish archaeological burial chambers (Waddell, J. and Barton, K, 1995, Seeing beneath Rathcroghan. The inversion of this data set, which has 67 electrode positions and 339 data points, takes seconds on a modern PC.įigure 2. (a) Apparent resistivity pseudosection, (b) resistivity model section, (c) apparent metal factor pseudosection and (d) metal factor model section. Multi-core support with RES3DINVx32/圆4, 256GB memory support with RES3DINV圆4 Supports parallel calculations on Intel (and compatible) based computers Supports surveys with electrodes at arbitrary positions (RES3DINV圆4) Supports more than 20000 electrodes and 100000 data points on computers with 16GB RAM (RES3DINV圆4) Supports up to 5041 electrodes and 67500 data points on computers with 1GB RAM (RES3DINVx32) Now available as a combined package together with RES2DINVx32/圆4, the 2D Resistivity & IP inversion program.

In areas where the geological structures are approximately two-dimensional (2D), conventional 2D electrical imaging surveys have been successfully used.

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