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《Chinese Journal of Geophysics》 2009-06
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Smoothest model and sharp boundary based two-dimensional magnetotelluric inversion

ZHANG Luo-Lei,YU Peng~*,WANG Jia-Lin,WU Jian-Sheng State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China  
How to get the rapid and stable inversion results and the clear geological interfaces is a focus problem in current Magnetotelluric (MT) inversion.With the purpose to represent clear boundary with resistivity discontinuity,the paper integrates the ideas of OCCAM inversion and sharp boundary inversion (SBI) to construct a new objective function for inversion by using the minimum gradient support functional and conjugate gradient inversion method to solve the optimal minimum.So the 2-D MT inversion method based on OCCAM and SBI is fulfilled. Through the model tests and comparisons with the related published inversion results,this method is proved accurate in determining sharp electrical interfaces based on the smoothest and stable models.It is also applied to process the field observed MT data in the regions of Guangdong Xuwen,the results indicate the effectiveness and feasibility of this method.
【Fund】: 国家高技术研究发展计划项目(863)(2006AA09Z359);; 国家自然科学基金项目(40674063);; 国家重点基础研究发展计划项目(973)(2007CB411706-02 2007CB411702);; 同济大学海洋地质国家重点实验室重点项目(MG20080103);; 国家科技重大专项(2008ZX05005-005-009HZ)资助
【CateGory Index】: P631.325
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