building site characterization. Recently there has been consid erable progress in the direct inversion of magnetotelluric and other low-frequency induction data for multidimensional elec ABSTRACT A new method of the resistivity imaging based on trical conductivity structures (Berdichevsky and Zhdanov, frequency-domain electromagnetic migration is devel 1984; Smith and Booker, 19881991; Wannamaker et aI., 1989; oped. Electromagnetic (EM) migration involves down Eaton, 1989; Madden and Mackie, 1989; deGroot-Hedlin and ward diffusion of observed EM fields whose time flow
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