Gravity inversion by improved iteration with variable density and its application in Xujiaweizi area
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Various methods to calculate the underground interface caused by the density contrast across different media were proposed. The density contrasts of these methods are from the earlier simple constant to the later realistic variable, and the variable density contrast of exponential is mostly used. But these previous approaches still involve a divergent term in the iteration process. In this article, we put forward an improved iteration inversion, which can avoid the divergent term and give an inversion with exponential variable density to fit in with the actual demand. Compared with the original method, this new inversion method obtains a more convergent and reasonable result. The new inversion method is demonstrated on synthetic data, which obtains a more accurate result. And we also apply it to real data of Xujiaweizi area in China to verify the performance of this method.
KeywordsGravity inversion Variable density Improved iteration Xujiaweizi area
The authors would like to thank Professor Xiaojuan Du for providing the real data over Xujiaweizi area and also thank the editors and reviewers for their constructive suggestions and comments on the manuscript to improve it.
This work is supported by ‘China Geological Survey Project (DD20179611, DD20160082)’ and ‘Special Funds for Basic Scientific Research & Services of Chinese Academy of Geological Sciences (Pre-research on Comprehensive Method of Deep Exploration: JYYWF20180101)’.
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