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近几年来,我们基本上采用了“由等T_0.图直接作构造图——一种空间校正方法“进行空间归位.但是,实践证明本方法尚有一些缺点:(1)偏移量与真深度分为二块量板使用不够方便;(2)量板绘制工作量较大.其实,从图1可以明显看出:对于速度随深度线性增大的连续介质,反射点P的偏移量L及垂直深度H恰好是射线图板中二组正交曲线簇的交点,一组是以t_0.为参数的等时线,另一组是以等t_0线的密度Δx/Δt_0为参数的射线.
In recent years, we have basically adopted the method of “making spatial maps directly from a map of T_0 - a kind of spatial correction method.” However, this method has some shortcomings: (1) In fact, it can be clearly seen from Fig. 1 that for the continuous medium whose velocity increases linearly with the depth, the deviation of the reflection point P The amount L and the vertical depth H are just the intersection points of two groups of orthogonal curves in the ray plate. One group is the isochronal line whose parameter is t_0. The other group is based on the density Δx / Δt_0 of the equal t_0 line Rays.