天水地区大地电磁测量及深部电性结构  

MT SURVEY AND DEEP ELECTRIC STRUCTURE IN TIANSHUI AREA

作　　者：刘宝勤[1] 朱佐全[1] 贾政[1] 郭万武[1] 李柱国[1] 张文仁 屈健鹏[1] 

机构地区：[1]国家地震局兰州地震研究所

出　　处：《西北地震学报》1995年第4期70-78,共9页Northwestern Seismological Journal

摘　　要：天水地区的大地电磁测量结果表明，在４３ｋｍ左右的深度上普遍存在高导层，这可能是壳幔过渡带的反映。岩石圈厚度大约９５－１１０ｋｍ。在天水太京附近可能存在一条大型近东西向地壳－岩石圈构造带，在秦安以北的叶堡和陇城附近可能也存在一条近南北向的大型地壳－岩石圈构造带，它们都是不同构造单元的分界线。１６５４年天水８级大震可能与深部热异常引起的热应力有关。The MT survey in Tianshui area shows that there is a high conductivity layer in the depthof 43 km,which may be the reflection of the crust-mantle transition zone. The lithosphericthickness is about 95-110 km. There might be a large crust-lithosphere tectonic zone nearlyin EW direction around Taijing, Tianshui, and there might be also a large crust-lithospheretectonic zone nearly in NS direction mear Yebu and Longcheng,Qin an,The two zones areall the boundary lines of different tectonic units.The Tianshui M 8.0 earthquake in 1654probably related to the thermal stress caused by the deep heat anomaly.

关 键 词：大地电磁测深 地下电性结构 地壳 岩石圈 

分 类 号：P631.322[天文地球—地质矿产勘探]