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《Chinese Journal of Geophysics》 1991-06
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CASCADE APPROACH FOR CROSS-HOLE SEISMIC TOMOGRAPHY

Du JIAN-YUAN YANG WEN-CAI(Beijing Computer Center of Geology, Beijing 100083)  
An inversion method which joins the tomographic inversions of traveltime and wavefield data have been proposed by authors for imaging earth with layers thinner than 1/4 wavelength. This method is characterized by the idea of successive approximation from low to high resolutions. The' further development of this idea is the cascade algorithm presented in this paper. Though several tomographic alogorithms, such as BPT, ART, SIRT, CGLS, LSQR and the inversion of the generalized Radon transform are available today, they all have advantages as well as defects, the algorithms of low resolution, such as BPT, enjoy low cost, stability and no requirement of prior knowledge about earth, they can be used first to provide initial earth model for higher resolution algorithms. The LSQR or CGLS algorithms may be used to produce a seismic velocity field, which can be further used as the reference velocity field in the inverse scattering methods, to produce a high resolution earth image by employing the inversion of rhe generalized Radon transform. In this manner, the proceed of seeking for solution in the solution space will take a correct route.Numerical analysis of the cascade algorithms is given together with some examples of application to fault mapping.
【Fund】: 地震科学联合基金
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