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《地震学报(英文版)》 2009-01
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Visco-acoustic transmission waveform inversion of velocity structure in space-frequency domain

Guihua Long 1,2,Xiaofan Li 1 Meigen Zhang 1 and Tong Zhu 1,2 1 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China  
According to the least square criterion of minimizing the misfit between modeled and observed data,this paper provides a preconditioned gradient method to invert the visco-acoustic velocity structure on the basis of using sparse matrix LU factorization technique to directly solve the visco-acoustic wave forward problem in space-frequency domain.Numerical results obtained in an inclusion model inversion and a layered homogeneous model inversion demonstrate that different scale media have their own frequency responses,and the strategy of using low-frequency inverted result as the starting model in the high-frequency inversion can greatly reduce the non-uniqueness of their solutions.It can also be observed in the experi-ments that the fast convergence of the algorithm can be achieved by using diagonal elements of Hessian matrix as the pre-conditioned operator,which fully incorporates the advantage of quadratic convergence of Gauss-Newton method.
【CateGory Index】: P315.31
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