Abstract

The following changes should be made to the paper, “Computer simulation of low-frequency electromagnetic data acquisition” by W. A. San Filipo and G. W. Hohmann (Geophysics, September 1983, p. 1219–1232).

The equation for the vertical magnetic induction in gammas over a conductive half-space for a vertical time-harmonic dipole (p. 1221) should be:  
B=200Mr3{9(9θ1/2+4θ+θ3/2exp(θθ},

The computed signals used in the examples are correct, as can be verified by the initial value (on-time primary field) of the time-domain response shown in Figure 15.

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