Improvement to the staggered-grid high-order difference method of one-order elastic wave equation
改进的一阶弹性波方程交错网格高阶差分解法

A paper, titled A staggered-grid high-order difference method of one-order elastic wave equation, written by Dong et al is published on Chinese Journal of Geophysics.In this article we find that the difference methods of dealing with all order derivatives are not a uniform scheme-2N order difference accuracy for one-order spatial derivatives, while center-difference for derivatives of higher order. We establish a difference scheme, which has fourth order accuracy either in time or spatial domain, possessing a uniform scheme. This method can help to program and improve accuracy.