Abstract
This paper presents a 2.5-dimensional finite element forward algorithm for calculating transient electromagnetic responses by a magnetic source when the conductivity varies continuously within each block. The main differences between this method and those in previous works are as follows: the conductivity parameter in a mesh cell varies linearly but is not a uniform value; in modelling transient electromagnetic method (TEM) data, the electromagnetic field is separated into a primary (background) and a secondary (scattered) field to avoid a source singularity. The background field is solved by an analytical method where only the components of electric and magnetic fields along-strike of a geoelectric structure are computed, and the secondary field caused by anomalous bodies is computed numerically. Finally, numerical checks of several typical examples against analytical solutions show that the solution provides accurate results.
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