The Deeper Electrical Conductivity Structure Of ShangYi-PingQuan

The source of this article is subordinate topics of “deep exploration andexperimental study of special array region of Qinghai-Tibet Plateau and northernearth electromagnetic field standard network model experiments ". During the test, Iparticipated in a wild first-line data acquisition and data processing, editing andprocessing. Ultimately，to get ShangYi-PingQuan fault zone extends the area of highquality magnetotelluric sounding (MT) data of impedance. According to experiments,using the impedance tensor decomposition method，electrical spindle direction of themeasuring point. Combined with geological data and geophysical researchspeculated that the electrical spindle direction of the study area of North East70°;Inaddition, calculated the mediaskewness. Experimental results show some areas deepshallow two-dimensional region is better， and showing the three-dimensionalcharacteristics. The nonlinear conjugate gradient algorithm (NLCG) inversion oftwo-dimensional accurately. The data of the study area were complete, and set anappropriate initial model and continuous improvement. In the calculation process,the different parameters affect the results. Thereby，the outcome determining theoptimum parameters. Finally, a large number of tests, the fault zone areahigh-precision two-dimensional electrical structure model.Through the inversion processing, the data in the interior, the electrical structuremodel of underground100KM the study area. Analysis of the electric model, foundthe structure of regional electricity as the shell of high resistivity apparentdevelopment, extending in a transverse strip, within the veil with high conductordevelopment; development of high resistance body shell, a greater depth ofcontinuous north, south of NE structure and cutting near latitude structure, resultingin abnormal crustal high conductor appear; the upper crust electric great lateralchanges along the line, the distribution of a number of electrical abnormalities anddistortion zone, through comparing with the regional tectonic data, these electricanomaly belt fault location and area and distortion zones within the belt tallies; regional tectonic information display, profile from north to south throughFengNing-LongHua fault zone, DaMiao-GaoSiTai fault belt, ShangYi-PingQuanlithospheric fracture zone and other large tectonic belt.According electric models combined previous studies, we can infer thefollowing conclusions：Firstly，Deposition of new crust in northern region is newer,development time is later; Secondly, For the Moho, the northern is deep and thesouth is shallow, the mean value is33-35km; Thirdly, the rigid structure of the uppermantle degree of preservation is good, there are high-conductivity layer mantleappeared, suggesting a depth of60km lithosphere. Lastly, the north of ShangYi-PingQuan fault impedance development, underground information simple, and Southmeasured varied. For the aforementioned conclusions, we can safely to say that theYanShan movement caused a significant impact.