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《Chinese Journal of Geophysics》 1994-02
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A NEW ALGORITHM OF SEISMIC TOMOGRAPHY WITH APPLICATION TO ENGINEERING DETECTIONS

YANG WEN-CAI(Institute of Geophysical & Geochemical Explorations, Langfang 102849) DU JIAN-YUAN(Beijing Computer Center of MGMR, Beijing 100083)  
Sparse matrix equations are usuallp involved for solutions of tomographic problems when traveltime or amplitude data are used.Orthogonal decomposition algorithms are currently used and have difficulties if the matrixes are badly ill-conditioned. This paper shows an improved algorithm of LSQR with damping iterations. Good results are demonstrated by real examples of detecting quality of bridge beds along the high way to Beijing airport.
【Fund】: 国家自然科学基金委员会、中国科学院、中国石油天然气总公司和大庆石油管理局联合资助
【CateGory Index】: U443.22
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