Elastic wave reverse-time migration with dynamic focused beams for weak anisotropic media

The elastic wave reverse time migration with Gaussian beams is a depth domain migration method combining the efficiency and flexibility of Gaussian beam migration with the high accuracy of reverse time migration, which enables targeted imaging. Its application in anisotropic media has been confined due to rapid divergence of Gaussian beam width with the increase of propagation distance and the complex anisotropic elastic wave ray tracing. By proposing a more accurate imaging method of elastic reverse time migration and an efficient calculation algorithm of elastic Gaussian beam migration, this abstract develops a method of anisotropic reverse time migration with dynamic focused beams. A complex structural model data test has shown a significantly improved imaging result.