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本文利用了地震层析技术的原理和方法,在云南地区成功地重建了10个不同深度的速度剖面图象,这些速度剖面和6条深地震测深的速度剖面一致。本文使用的重建方法有两大优点:(1) 速度模式是通过指定节点速度和通过已知基函数的线性插值而确定,这样就建立了一个横向连续而垂向不连续的速度场;(2) 速度参数和震源参数通过正交投影算子使之分离,采用顺序正交三角化和修正的奇异值分解,这些措施使内存的需要量减小一个量级,计算量减少一半。
In this paper, we use the principle and method of seismic tomography to successfully reconstruct 10 velocity profiles at different depths in Yunnan. These velocity profiles are consistent with the velocity profiles of 6 deep seismic soundings. The reconstruction method used in this paper has two major advantages: (1) The velocity mode is determined by the velocity of the specified node and the linear interpolation of the known basis function, thus creating a velocity field that is continuous in the transverse direction and discontinuous in the vertical direction. ) Velocity parameters and source parameters are separated by orthogonal projection operators using sequential orthogonal triangulation and modified singular value decomposition that reduce the memory requirement by one order and reduce the amount of computation by half.