对目标函数进行梯度优化，我们得出了介质速度的迭代公式。
By optimizing the objective function with the gradient method the iterative formula about the medium velocity is obtained.
介绍一种能够适应介质速度横向变化的非稳态相移算子及其叠前深度偏移方法。
The paper introduces a prestack depth migration by nonstationary phase shift method suitable for laterally variable velocity.
本文提出了一种利用反射波走时曲线计算垂向非均匀介质速度和反射界面深度的方法。
A method is presented, which makes it possible to calculate velocity and interface depth of the reflected wave in a vertically inhomogeneous medium.
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