Abstract: Through investigating the characteristics of analytical iterative method for homogeneous half-space TEM, it is concluded that the “Runge” multiple solutions is in the same physical form with that generated by systems noise. Hence, the stochastic resonance algorithm was introduced to eliminate the “Runge” multiple solutions. The results showed that the proposed inversion method was effective in solving the multiple solutions in inversion calculation of iterative algorithm of TEM all-time apparent resistivity with high retrieval accuracy.

Key words: Stochastic resonance, Transient electromagnetic, Runge multiple solutions, Al1-time apparent resistivity