Fast approximate solutions of transient EM response to a target buried beneath a conductive overburden

Fast TEM solutions for a thin-plate conductive target buried in a resistive host rock overlain by thin conductive overburden are derived. For this model, the total TEM field is composed of the overburden response, which is known analytically, and the target response that is approximated by a wire loop. Thus, the transient response of the target in free space is approximated with a single exponential function. The approximate solutions agree reasonably well with scale model and numerical results, but their computation is more than 100 times faster than conventional methods and can be easily done on a small personal computer. -from Authors