Abstract
The applicability of EM filters to compute resistivity sounding curves and that of resistivity filters in computing EM sounding curves is shown. This has been possible mainly because of the flexible nature of the filtering process involved which permits us to redefine an input function in order to suit a particular filter function. The desired output can then be obtained by convolving the modified input with the chosen filter. This flexibility can be used advantageously to compute the electrical and EM response of a layered earth to a number of source-receiver configurations by using the resistivity and the EM filters individually or jointly, as required. The study leads us to establish the relationships among various coil configurations used in EM sounding. A great computational advantage accruing from the present study is that the nine point filter to compute Schlumberger resistivity curves can also be used to compute EM sounding curves for perpendicular and vertical coplanar loop systems on programmable pocket calculators such as the HP-67 or TI-59.
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