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

Abstract

In this part of the paper the excitation of the scattered surface waves is considered in detail. Since these solutions satisfy the reciprocity relationships in electromagnetic theory, they can also be applied directly to derive the scattered radiation fields due to incident surface waves. A detailed examination of the modal equation is presented and the complex wave parameters for the surface waves (guided modes) of the structure are plotted as functions of frequency and overburden depth. Since the scattered radiation fields vanish very near the earth's surface, the scattered surface waves constitute the dominant part of the total scattered fields near the earth's surface. This work may also be applied to problems of coupling into and out of dielectric waveguides.