Multi-component joint inversion of gravity gradient based on fast forward calculation |
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Authors: | YUAN Zhiyi ZENG Zhaofa JIANG Dandan HUAI Nan ZHOU Fei |
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Institution: | College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China |
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Abstract: | With the development of gravity gradient full tensor measurement technique , three-dimensional (3D) inversion based on gravity gradient tensor can provide more accurate information .But the forward calcula-tion of 3D full tensor sensitivity matrix is very time-consuming, which restricts its development and application . According to the symmetry of the kernel function , the authors reconstruct the underground source of geological body to avoid repeat computation of the same value , and work out the corresponding relationship between the re-sponse of geological body to the observation point and the response of reconstructed geological body to the obser -vation point .According to the relationship , rapid calculation of full tensor gravity sensitivity matrix can be achieved .The model calculation shows that this method can increase the speed of 30-45 times compared with the traditional calculation method .The sensitivity matrix is applied to the multi-component inversion of gravity gradient .The application of this method on the measured data provides the basis for the promotion of the meth -od. |
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Keywords: | rapid forward calculation full tensor gravity survey joint inversion inexact line search FR con-jugate gradient method |
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