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Long Period Magnetotelluric Data-Based Study on Deep Fault Structure in Shanghai and Zhejiang Area

YU Peng,WU Jiansheng,WANG Jialin,ZHANG Xinbing(State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China)  
A magnetotelluric sounding(MT) profile from Fengcheng of Shanghai to Huzhou of Zhejiang were collected on the basis of the new electromagnetic surveying system GMS-06.These long period MT data contribute to the studies of deep electrical and fault structures.The concept of pseudo-tipper is proposed and the effects to study the faults by using pseudo-tipped data are presented through model test and field data application.In accordance with MT migration imaging and inversion results,new recognitions about deep conductivity and faults are obtained.Several deep large faults that cut through the crust are deduced and interpreted.
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