Compared with one-way wave equation migration methods, reverse-time migration has advantages in the aspects of amplitude preservation. In this paper, we extend the angledomain true-amplitude acoustic reverse-time migration to elastic case. First, we propose to modify the source term as the boundary condition to reconstruct the vector source wavefield and use the true-amplitude wavefield separation method to obtain amplitude-preserved P-and S-waves. Then, the extended imaging condition and angle decomposition procedure are applied to obtain the relatively amplitude-preserved angle-domain common image gathers. In numerical examples, we carry out the amplitude preservation analysis by comparing the peak amplitudes of the angle-domain common image gathers with the theoretical reflection coefficients calculated by solving the Zoeppritz equations. The results demonstrate that the angle-domain common image gathers are not only kinematically correct but also relatively amplitudepreserved.
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