Wavefield extrapolation: from pseudospectral method to nonstationary phase shift

Zhengsheng Yao, Gary F. Margrave

The pseudospectral method as a limit of finite differences of increasing orders has been successfully used for forward seismic modeling. In this paper, the pseudospectral method is applied to a localized wave equation for wavefield extrapolation in inhomogeneous media. As a limiting case, this method leads to the nonstationary phase shift method.