Abstract
Summary To make a reasonable interpretation of seismic data, anisotropic features should be considered. Although there are numerous studies on migration with anisotropic features taken into account, for anisotropic waveform inversion only a few studies are encountered in literature. Because many parameters are needed to describe anisotropic media, anisotropic waveform inversion has not been successful. In this study, we develop a 2D frequency-domain elastic full waveform inversion algorithm using the finite-element method for vertically transversely isotropic media (VTI). Our inversion algorithm is mainly based on the backpropagation technique. Source wavelet is also estimated in addition to elastic constants. We investigate the feasibility of our inversion algorithm for synthetic data of the anisotropic overthrust model. Our inversion results are better than previous inversion results obtained by the finitedifference method for some parts of the model, which may be due to boundary conditions. Nevertheless, further improvement should be made on anisotropic waveform inversion to obtain reliable information through anisotropic waveform inversion.
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