A Wave-field Decomposition for Reverse Time Migration to Reduce the Low-wavenumber Artifact

Reverse time migration (RTM) is a powerful tool for reconstructing images, and has great advantage in imaging complex velocity models. However, traditional cross-correlation imaging condition brings low-wavenumber artifact (LWA). In this paper, we present a wave-field decomposition method to reduce these high-amplitude noises and achieve better imaging results.The main procedures include decompose source and receiver wave fields into up-going and down-going wave components, then a cross-correlation imaging condition are adopted to image the wave fields respectively. Several numerical examples indicate that the proposed method can effectively suppress LWA and obtain high-quality reconstructed images.