Abstract
Summary Anisotropy is intrinsically an elastic phenomenon. The widely-used acoustic anisotropic wave equation results in significant shear wave presence in both modeling data and reverse time migration images. In this abstract, we discuss two approaches to reduce the S-wave noise in migration. The first is based on an elastic anisotropic wave equation with non-zero S-wave velocity to attenuate S-wave noise. The second approach uses a supplementary routine to remove the S-waves after wavefield modeling in each time step. Impulse responses and a simple 2D TTI example show that both methods reduce S-wave energy significantly and lead to a cleaner image than those based on the conventional acoustic anisotropic wave equation.
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