三维介质中速度结构和界面的联合成像

Simultaneous tomography of 3-D velocity structure and interface

根据波逆行原理推导了三维介质中地震波射线走时对界面偏导数的完整基本关系式,并对基本关系式进行简化,得到其在二维和一维介质中的关系式.给出了任意多个复杂界面情况下,反演时所需的走时对界面偏导数系数矩阵.为了检验三维介质中速度和界面联合成像理论的有效性,进行了数值模拟计算,很好地对三维速度结构和界面进行了重建.

We deduce the 3-D interface partial derivative of the travel time according to the theory of wave inverse propagation, simplify the full formula of 3-D interface partial derivative and gain the interface partial derivative of the reflection travel time in 2-D media and 1-D media. We also give the matrix forms of the interface partial derivative with multiple complex interfaces. For determination of the validity of this method, we give the results of numerical simulation that show the method can reconstruct 3-D velocity structure and interfaces well.