天津武清—塘沽MT剖面深部电性结构

The Deep Electrical Structure Revealed by Magnetotelluricl(MT) Profile from Wuqing to Tanggu

利用V8电磁系统加长观测周期结合数据整合完成了天津武清—塘沽剖面的长周期大地电磁数据采集,获得了超过4000s的高质量观测数据,为研究天津地区深部电性结果提供了基础。通过重磁电数据联合反演处理,在电性和断裂结构上获得了新的认识,查明了地区主控边界断裂位置及展布特点,同时结合物性资料对高阻基底以上的电性层进行了解释,了解了基岩深部构造,发现了壳内高导层,并基于断裂系统成果讨论了天津地区的地壳稳定性。

A magnetotelluricl sounding （MT） profile with long period data from Wuqing to Tanggu in Tianjin was conducted by a V8 surveying system, also high quality data over 4000s were obtained. These achievements provide basis for the study of deep electrical and fault structures. By joint inversion and processing of heavy magnetoelectric data, new rec ognitions about the electrical and fault structures are obtained. The location and distribu tion of main boundary faults are identified Meanwhile, the electrical strata overlying on the high resistant basement is interpreted combined with physical properties data. This paper i- dentified the deep structure of bedrock and found the high conductivity layer in crust. Fi- nallay, the stability of the crust in Tianjin is discussed.