Converted-Wave Traveltime Equations in Layered Anisotropic Media – An Overview

P105 CONVERTED-WAVE TRAVELTIME EQUATIONS IN LAYERED ANISOTROPIC MEDIA – AN OVERVIEW Abstract 1 There are various types of converted-wave (C-wave) traveltime equations: for example two-term or three-term Taylor series expansions and double-squared-root (DSR) equations. These different types of equations often have different kinds of parameterization and applicability. In this paper we examine the accuracy and limitations of these equations and present improved equations under a unified system for multi-layered anisotropic media. These new forms of equations are accurate for far offsets up to twice the reflector depth and can be used for velocity analysis parameter estimation and prestack imaging in