Electromagnetic Induction in Three Dimensional Structures for Various Source Fields

Abstract

A numerical method is used to calculate the electromagnetic fields associated with three-dimensional conductivity anomalies. Three source field-conductivity structure combinations are considered. A uniform source above an island structure as well as a two-dimensional non-uniform source above an L-shaped embedded structure and a horizontal dipole above an embedded square anomaly are studied. Profiles of selected electromagnetic field quantities and ratios are presented along with the appropriate phases for various positions relative to the anomalous structure. Three dimensional figures of the amplitude of the electric and magnetic field components are given for each source field-conductivity structure combination. The source field effect is clearly evident in all profiles.