【摘要】 介绍了一种用变分原理进行射线追踪和反演的方法。根据欧拉方程对于连续性层状介质进行了方程推导，得出一个波的射线路径公式，公式形式尤其简单。在背景速度场为深度的单调函数时，利用代数重建技术反演了速度分布。数值模拟结果表明所给方法行之有效。更多还原

【Abstract】 The paper presents a method of ray tracing and inversion based on the variational principle. A simple formula for ray path is derived from the Euler equation in continuous stratified medium. The distribution of velocity is inverted as the monotonic function of depth by using algebraic reconstruction technique. The numerical results show the validity of the inversion method.更多还原