论文部分内容阅读
本文采用程函方程有限差分法计算通过速度模型的初至旅行时射线路径，然后引入先验地质信息和正则约束条件，用约束最小二乘正交分解法（ＣＬＳＱＲ）进行走时反演，获得近地表速度结构。这种层析反演方法以块体为基本单元，可以模拟和反演复杂速度结构。它不必识别波形，计算速度快。实际数据的反演结果表明，在复杂地表条件区表层速度存在强烈的横向变化，经层析反演获得的叠加剖面成像更加清晰。
In this paper, we use the finite difference method of equation to calculate the ray path of the first trip through the velocity model, and then introduce the prior geological information and the regular constraint conditions, and use the constrained least squares orthogonal decomposition (CLSQR) Surface speed structure. This tomographic inversion method takes block as basic unit and can simulate and invert complex velocity structure. It does not have to recognize the waveform, calculation speed. The inversion of actual data shows that there is a strong lateral variation of surface velocities in complex surface conditions and the superimposed profile obtained by tomographic inversion is clearer.