Local angle-domain elastic reverse time migration (ERTM) can provide more opportunities for complex structure imaging and elastic parameter inversion. However, its implementation still has many challenges, especially in anisotropic media. We present an accurate local angle-domain ERTM algorithm for heterogeneous TI media on the base of the cross correlation imaging condition and vector decomposition of the elastic wave modes. At the mean time, the computational cost is significantly reduced by applying fast algorithms of wave mode separation and decomposition using low-rank approximation of the mixed-domain operators. Synthetic example shows that, compared with the Helmholtz decomposition, the efficient wave mode separation/decomposition based on polarization projection promotes the quality of angle-domain common-image gathers for TI media.


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