Wavefield extrapolation: from pseudospectral method to nonstationary phase shift

Zhengsheng Yao and Gary F. Margrave

ABSTRACT

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.

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