PS转换波非双曲时差分析

Analysis of PS Converted Wave Non-hyperbolic

由于PS转换波传播路径的不对称,转换点与中心点不在同一水平位置,这就造成了PS转换波时距曲线的非双曲特性。在大炮检距情况下这种情况尤为明显。本文对几种典型的拟合公式得到的时距曲线与射线追踪得到的准确时距曲线进行了误差分析,结果表明:目前的PS波近似公式在大炮检距条件下均有较大的误差;Li Xiangyang的近似公式在整体上比其它近似公式精度更高;目前的PS转换波近似公式在中大炮检距条件下的精度有待进一个提高。

Because of the dissymmetry which spread path of the PS converted wave, the converted point with central point not at same level position, this resulted in time--distance of PS converted wave being apart from hyperboli offset is much bigger than the depth, Analysi rots between a few kinds of typical traveltime studied in this paper. c. This characteristic is very obvious when the s of non--hyperbolic time--distance curve erapproximation and precision numerical value is