Seismic anisotropy has evolved over the years from an esoteric, largely theoretical field to a key component in building robust subsurface models from seismic data (for a detailed historical overview, see Helbig and Thomsen, 2005). Transversely isotropic media with a vertical (VTI) and tilted (TTI) axis of symmetry have become standard in seismic imaging (Tsvankin et al., 2010), and many wide-azimuth surveys are currently processed with more complicated orthorhombic models. Azimuthally anisotropic seismic signatures provide the foundation for characterization of fractured reservoirs, and anisotropic models are increasingly used in full-waveform inversion, processing of microseismic data, and time-lapse...

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