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《Progress in Geophysics》 2007-06
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Initial velocity model of crosswell seismic tomography

DUAN Xin-biao,JIN Wei-jun(Institute of Geology & Geophysics,Chinese Academy of Sciences,Beijing 100029,China)  
The direct wave tomography is to solve one large-scale,sparse,ill condition linear equation.The rational initial solution and speed model is commonly used in the iterative method of linear equation.The initial model concerns the exactness and efficiency in the inversion.The paper puts forward a method to produce the node initial speed of the models based on the former study.The straight line from source to receive is assumed especially,the program records the cells for each ray,and makes the statistics of the ray number cross each cell,automatically picks up the nodal number of cells and so on.In the instance it is fine that the initial node speed produced by the forward travel time based on the primitive mathematics model.Finally we made the iterative inversion between the homogenous model and the initial model produced by our method separately.We verify that the produced automatically model is the feasibility and dependability through comparing,and discuss and explain about the existing problem.
【Fund】: 中国科学院工程地质力学重点实验室课题资助
【CateGory Index】: P631.4
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