Abstract

Summary Current methods for the estimation of fast and slow shear wave velocities, depend on the assumption that the two waves have identical propagation properties. Furthermore, they do not easily lend themselves to standard error estimates of the determined velocities and strike angle. We present a method, which decouples the estimation of fast and slow shear wave, so that the two shear waves can have different propagation properties. The method is strictly based on modeling/inversion, which in turn makes it possible to use standard error estimation techniques. The decoupling furthermore immediately produces an error estimate for the determination of strike angle. We show the method for synthetic anisotropic data and two field data examples. The field data is from an anisotropic and an isotropic formation

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