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《Progress in Geophysics》 2013-03
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Data acquisition and processing technology of long-period magnetotellurics

YE Gao-feng1,2,WANG Hui1,2*,GUO Ze-qiu1,2,XIE Cheng-liang1,2,GONG Xiu-gang2,3(1.Geo-detection and instruments Laboratory,Ministry of Education,Beijing 100083,China; 2.School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China; 3.College of Computer Science and Technology,Shandong University of Technology,Zibo 255049,China)  
In order to research the electrical structure of the circle at the bottom of the upper mantle lid and the asthenosphere.It needs to acquire very long period Magnetotelluric(MT) signal,even as long as several tens of thousands of seconds.This requires some special characteristics and superior accuracy of MT instruments,and high technology of data processing.In this paper,we discussed some the special characteristics of long periods Magnetotelluric(LMT) instruments,especially the difference of magnetic sensor between broad band Magnetotelluric(BMT) and(LMT).Then we summarized our experience for layout the LMT station,such as,increasing electrodes length to observe larger signal,used the long-time stable electrodes.And also we did some experiment on how to improve the accuracy of acquisition signal.The results of data processed show that if we applied very stable non-polarizing electrodes and set the station reasonably.We can get satisfactory signal as low frequency as we wanted.
【Fund】: 资助项目“深部探测技术与实验研究”专项课题(编号:sinoprobe-01-02);; 国家自然科学基金青年基金项目(编号:40904025);; 中央高校基本科研业务费共同资助
【CateGory Index】: P631.325
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