Additional mathematical development using vertical dikes and contacts has been carried out to provide a better understanding of the response patterns encountered in field measurements with the magnetic induced-polarization (MIP) method.It is shown by model studies that the presence of large conductivity contrasts in the earth may strongly influence the induced-polarization (IP) response, at the earth's surface, of a buried electrically anomalous body. For example, an overlying conducting layer will greatly reduce the electrical induced polarization (EIP) relative to the MIP response. Lateral conductivity changes likewise may reduce the relative EIP response amplitude and markedly distort the MIP response pattern.

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