【摘要】 改进文献[1]提出的有限差分计算走时的算法．射线路径也可根据互易性原理求出．模型计算表明该方法精度较高并适用于速度差较大的情形．该算法对层析成像、选前Kirchhoff偏形特是非常有用的．更多还原

【Abstract】 The finite-difference scheme proposed by Vidale (1988) is improved. In the present method, ray paths can also be derived by reciprocal principle. The method appears to be reasonably accurate for a variety of models with moderate and large velocity contrasts, and is useful for tomography and prestack Kirchhoff migration.更多还原