We explore the possibility to identify a nonconducting object of a known size and geometry buried in sand-clay conducting sediments lying over frozen ground. The anomaly, which is located on the surface of the low-conducting layer, is detected with a multi-electrode dc array. Its 3D electric field is simulated as a boundary-value problem using specially designed software. The new algorithm is tested with synthetic and field data and the results are used to develop the procedure of object identification and location.

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