浮动基准面下静校正对速度分析精度的影响分析

Effect of Floating Datum for Static Correction on Velocity Analysis Accuracy

复杂起伏地表尤其山地表层结构下的速度分析的精度直接受到浮动基准面的选择的影响,本文推导出在浮动基准面上速度分析误差公式,指出基于浮动基准面上的速度分析的误差与替换层的速度成正比,与浮动基准面与水平观测面的高程差成正比,与目的层埋深成反比。同时,基于理论模型,定量分析了浮动基准面上速度分析的误差,为速度误差校正提供了依据;也验证了基于浮动基准面上的速度分析的误差比基于固定基准面上的速度分析误差小。

The choice of floating datum for static correction has direct effect on the accuracy of velocity analysis in complex rugged topography,especially the surface structure like mountainous region.We deduce the formula about the error of velocity analysis on the floating datum for static correction in this paper.The formula indicates that the error of velocity analysis on the floating datum for static correction is in proportion to velocity in substituting layer and elevation difference between floating datum and level observed plane,and in inverse proportion to buried depth of target layer.Meanwhile,based on theoretical models,the error of velocity analysis on the floating datum for static correction is quantitatively analyzed,which provides the basis of correction of the velocity error and validates the error of velocity analysis on the floating datum smaller than on the level observed plane.