Absorbing boundary conditions of arbitrarily wide-angle acoustic equations reverse-time migration
HE Bing-shou
ZHANG Hui-xing
ZHANG Jian-jun
Abstract：Studied the absorbing boundary conditions (ABCs) for the prestaek reverse-time depth migration based on the 2D arbitrarily wide-angle one-way acoustic wave equation. The wavefield computation at the bottom boundary was realized by the wavefield continuation algorithm of inner grids, while the boundary reflection at the top boundary was eliminated by combination of pseudo-grids and rigid boundary condition. As to the right and left boundaries, illustrated corresponding wavefield computation algorithm, and derived the finite-difference scheme for the reverse-time continuation at these two boundaries. Numerical example of impulse response in homogeneous medium shows that the outgoing waves that fall on the truncation boundary can be effectively absorbed with as few as three absorbing layers added, leaving no boundary reflection. Also, migration for Marmousi model based on these ABCs is satisfactorily fine in its result.
Keywords：arbitrarily wide-angle acoustic equationscoustic wavereverse-time migrationboundary conditions
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 106-109 )