Overview

A continuation of ""Acoustic and Elastic Wave Fields in Geophysics, Part I"" published in 2000, this second volume is dedicated to propagation of linear plane, spherical and cylindrical acoustic waves in different media. Chapter 1 is devoted to principles of geometric acoustic in plane wave approximation. The eikonal and transport equations are derived and ray tracing and wavefront construction techniques are explained. Chapter 2 deals with dynamic properties of wave fields. The behaviour of pressure and displacements amplitudes in zero approximation is analyzed in two ways: using Poynting vector and solving the transport equation. This chapter contains several examples related to shadow zones and caustics. In Chapter 3, using the results of analysis of high-frequency wave kinematics and dynamics some fundamental aspects of Kirchhoff migration are described. Chapters 4 and 5 are devoted to propagation of plane waves in media with flat boundaries in the case of normal and oblique incidence. Special attention is paid to the case when an incident angle exceeds the critical angles. Formation of normal modes in the waveguide is also discussed. Chapter 6 deals with a spherical wave reflection and refraction; the steepest descent method is introduced to describe the behavior of reflected, transmitted, head and evanescent waves. In Chapter 7, the propagation of stationary and transient waves in a waveguide formed by a flat layer with low velocity is investigated. Normal modes and waves related to the branch points of integrands under consideration are studied and dispersive properties of normal modes are discussed. Chapter 8 describes wave propagation inside cylinder in acoustic media. The title also includes several appendices designed to help the reader understand different aspects of the mathematics used in the book.

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