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《EARTH SCIENCE-JOURNAL OF CHINA UNIVERSITY OF GEOSCIENCES》 1999-06
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LEAST SQUARE 2_D INVERSION METHOD FOR INDUCED POLARIZATION DATA

Ruan Baiyao (Department of Resources and Environment Engineering, Guilin Institute of Technology, Guilin541004) Yutaka Murakami (Geophysics Department, Geological Survey of Japan, Psukuba305) Xu Shizhe (Department of Earth Science, Zhejiang Univer  
A least square 2_D inversion method for resistivity and induced polarization data is presented. The major difference between this method and the traditional methods in the same category lies in the linear changes in conductivity and polarizability within each grid cell instead of in the mean values. In this sense, this method can bring about more accurate data for the inversion of resistivity and polarizability. With this inversion method the isogram can be drawn more easily. The triangular cell is employed for the conversion calculation of the 2_D finite elements, so that no topographic adjustment is made before the inversion of the measured data. The addition of such prior information as the simplest model and the background field to the target functions may not only remove the multi_solutions of the inversion, but also make the inversion results more appropriate to the realistic cases. The simple relationship between the potential function and the model parameters is also employed to calculate the partial derivative, greatly reducing the work load for the calculation of the Jacobian matrix. The results of the inversion of several model data and measured data show that the precision of inversion is good.
【Fund】: 国家自然科学基金项目 !(No .4960 40 60 );; 广西自然科学基金匹配项目和日本国际科学与技术基金联合资助
【CateGory Index】: P631.3
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