Reviews on seismic anisotropy based on shear-wave splitting in the Tibetan Plateau

The research on the anisotropy of shear wave splitting in the Tibetan Plateau has been carried out for nearly 30 years, and important progress has been made in theoretical methods and practical applications. A large number of shear wave splitting results obtained from teleseismic records, which provides an important basis for understanding the deformation characteristics and dynamic mechanism of the crust and mantle anisotropy in the Tibetan Plateau. In this paper, we first introduce the source and application of seismic anisotropy in the Earth's interior; then review the development of shear wave splitting analysis methods, briefly expounds the principle of various shear wave splitting methods; finally, systematically analyze the crust-mantle anisotropic characteristics in the Tibetan Plateau by summarizing the shear wave splitting results of the anisotropy in the upper crust, crust and upper mantle in the Tibetan Plateau over the past 30 years. Based on the comparison of the shear wave splitting results, we find the XKS wave splitting results are the most stable, the direct S wave splitting results from local earthquakes are better, but the Pms wave splitting results are more discrete. The Pms wave splitting results of different studies in the same research area are often different. The main reason may be the signal-to-noise ratio of the Pms wave is lower than that of the XKS wave and the direct S wave of the local earthquake. The secondary reason may be the differences in methods and processing analysis of various studies.