Coupling fully staggered grids via numerical filtering for wave propagation simulation

• DOI: 10.1190/geo2024-0049.1
• Publication Date: 2025-01-15T15:19:31Z
• Authors: Luqian Jiang; Jun Tian; Tao Lei; Wei Zhang

The fully staggered grid (FSG) combines multiple standard grids (SSGs) to simulate seismic wave propagation in anisotropic elastic media. However, its accuracy is contingent upon the wavefield’s consistency and continuity across sets of SSGs. In isotropic or weakly media, decoupling weak coupling between SSGs can lead wavefield discontinuities at adjacent points diagonal direction. Issues such as inconsistent source activation, medium parameter discontinuities, different numerical treatments boundary conditions over exacerbate these problems. While previous methods, FD-consistent point technique equivalent parameterization have partially addressed issues, they do not completely solve problem. This study, drawing inspiration from damping techniques used collocated-grid finite-difference schemes eliminate odd-even oscillations, introduces an explicit filter operator along direction FSG. approach ensures SSGs, improving FSG scheme. Although this method increases computational costs, it essential for reliable modeling