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《OIL GEOPHYSICAL PROSPECTING》 1997-01
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Restrained travel time tomography

He Qiaodeng.Znang Wensnsng,(Teaching and Research Section of Seismology, Changcnun College of Geologg, Changchun City,Jilin Province,130026)  
Seismic tomography is an important technique for estimating subsurface veloci-ty structure. Unlike medical CT, seismic tomography often uses less enough databecause seismic rays fail to uniformly cover the objective area. If a poor initial mod-el is chosen in such case, conventional tomography methods, such as damped leastsquare method, algebraic reconstructioh technique etc. can hardly produce satisfac-tory results. To cope with the problem, we put forward a restrained tomographymethod, which s0lves least square problem after an inequality restriction is given.The solution of optimized problem under the restriction is deduced in the article.The idea of solving this prob1em is also app1icable to solving other non1inear re-strained optimization problems. The final numerical result and the relevant evalua-tion prove this method effective and superior in the case 0f less enough data. Whatis more, the method has certain noise resistance.
【CateGory Index】: P631.4
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