Electromagnetic fields of a small loop buried in a stratified Earth

The field structure of a buried vertical oscillating magnetic dipole is examined. The earth is represented as a two-layer half-space, and the source is located in the bottom semi-infinite region. Using numerical integration, the magnitude of the ratio of the horizontal to the vertical magnetic field is examined for an observer on the earth´s surface. It is shown that at sufficiently low frequencies, the field ratio is not appreciably modified by the finite conductivity and the geometry of the layers.