Abstract
In a vertical transversely isotropic (VTI) medium, qP- and qSV- waves are intrinsically coupled as described in elastic wave equations. Therefore, when we perform elastic reverse time migration and imaging processes to qP-waves, qSVwave energy will introduce crosstalk noise to the imaging results. Many authors have proposed to separate qP-waves from elastic waves for better imaging results. As an alternative approach, in this study, we develop a first-order wave propagator of pseudo-pure-qP-wave in 2D heterogeneous VTI media using a staggered-grid scheme. We have performed this algorithm to simulate P-waves propagating in an isotropic medium, VTI media with weak/strong anisotropy and a two-layer VTI model, the synthetic results validate the feasibility of this algorithm.
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