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《Chinese Journal of Geophysics》 1983-02
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THE ELECTRICAL STRUCTURE OF THE CRUST AND UPPER MANTLE AND ITS RELATIONSHIP WITH SEISMICITY IN THE BEIJING-TIANJIN-TANGSHAN REGION AND ADJACENT AREA

LIU GUO-DONG GU QUN SHI SU-LIN SUN JIBSHI ZHANG-SONG LIU JIN-HAN (Institute of Geology, State Seimological Bureau)  
The Beijing-Tianjin-Tangshan region and adjacent area are one of strong earthquake region in China and technically have undergone intense disturbance resulting in uprise of surrounding mountain regions and intensive fracture and subsidence of the plain since Cenozoic age. MT measurements at 30 sites have been carried out since 1976. Data of MT were processed by the tensor impedance method and the apparent resistivity curves of E polarization were fitted to 1-D models for obtainning the electrical structure of the crust and upper mantle. The results of interpretation indicate that within the intermediate crust, there widely exists a high conductive layer with thickness of several km and resistivity from several to more than ten Ωm, and it corresponds to the low velocity layer in the crust determined by DSS; a high conductive asthenosphere with resistivity of one to several Ωm lays at a depth from 50 to 80 km beneath the plain and at a depth of more t han 100 km in the surrounding mountain regions, and it corresponds to the low velocity layer in the upper mantle determined by seismic methods. The variable tendency of the depth of high conductive asthenosphere receives a strong support from the heat flow measurements, Curie isothermic surface calculations and geochemical studies of the Cenozoic basalts. The strong shocks occurred there mainly along the margins of the uplift of the high conductive asthenosphere and the foci were located generally over the high conductive layer in the intermediate crust.
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