Study on Deep Electrical Structure Characteristics of the Shulan Section of the Yilan-Yitong Fault Zone
The Yilan-Yitong fault zone is an important boundary of the China-Mongolia active block and the China-Korea active block,and it is the largest fault system in Northeast China.The latest research results show that the Shulan segment of the Yilan-Yitong fault zone was intensively active in the Holocene,which challenges the previous con-clusion that the fault activity in the Holocene was weak.In this paper,a broadband magnetotelluric profile data ob-tained at 14 measuring sites across the Shulan section of the Yilan-Yitong fault zone have been refined and inversed in 2D space,and the characteristics of the deep electrical structure along the Shulan section of the Yilan-Yitong fault zone have been obtained.The characteristics of the deep electrical structure of the blocks on both sides of the Shulan section have been obtained too.The results show that the electrical structure of the Shulan section and its ad-jacent areas is characterized by East-West lateral blocking;the main fault of the Shulan section is embeded in the unstable medium-low-resistivity bands extending to the middle-lower-crust,on east side and west side of the Shulan section there exist the high-resistivity bodies.Referring to the magnetotelluric detection results of other active-fault areas in Chinese Mainland,we speculate that the electrical structure feature of the Shulan section is conductive to stress accumulation and faulting.There exists earthquake risk in this area in the future.
万方数据
维普
