Radio-Wave Method for geophysical prospecting

Abstract

The problem of ground wave propagation over a nonuniform overburden with arbitrarily varying complex dielectric coefficient and depth is analyzed. Using a full wave approach, the effects of the nonuniform overburden upon the surface wave and the radiation field are examined. The criteria for distinguishing between the effects of variations of the overburden depth and variations of its complex dielectric coefficient are determined. In particular, the feasibility of using radio‐wave measurements to map the water table and the overburden conductivity is explored.

Transient electromagnetic response from nonparallel stratified models of the earth's crust: 2, the scattered surface wave

“…To this end it is necessary to solve the modal equation for the surface wave parameters of the structure as functions of frequency and overburden depth. The basis for this work is the full-wave solution for the steady state electromagnetic fields over a nonuniform model of the earth [Bahar, 1970[Bahar, , 1971a. Transient responses for Loran C pulse excitations are derived using the Fast Fourier Transform as well as analytic techniques and the medium effects on the pulse delays and distortions are considered.…”