Chapter 4: Surface-to-Surface Paraxial Ray Theory
This chapter contains paraxial-ray-theory foundations for understanding most of the derivations and analyses presented later in connection with seismic true-amplitude imaging. It also provides the links between the factors that appear later in the imaging formulas and dynamic ray tracing, and thus indicates how to practically compute the quantities involved in the Kirchhoff-type imaging methods. Wherever possible, we chose definitions of quantities and variables that agreed with the conventions previously used by us and by other authors. However, some notational differences from previous publications were unavoidable.