摘要
华北地区的现代垂直构造运动基本上沿袭着新构造运动的格局发展,大体上可以划分为鄂尔多斯上升区、汾渭下降带、太行山上升区、渤海下降区、冀豫下降区、冀辽上升区、齐鲁上升区和定县—德州过渡区等八部分。此外还有较小规模的银川下降区、中卫下降区、五原—呼和浩特下降区和下辽河下降区等四部分。 现代水平运动不甚强烈,年应变率为10^(-8)级。主压应变轴向北50°东左右。南东向的拉张应变占主导地位。
The recent vertical movement in North China region inherits generally the development of neotectonic framework. Eight zones in the region can be distinguished, such as Ordos uplift zone, Fen-Wei subsidence zone, Taihangshan uplift zone, Bohai subsidence zone, Heibei-Henan subsidence zone, Hebei-Liaoning uplift zone, Qilu uplift zone and Ding xian-Dezhou transition zone. In addition, some small subsidence zones also exist, such as Yinchuan, Zhongwei, Wuyuan-Hohhot and Xialiaohe subsidence zones.The recent horizontal movement is not intense in this region, annual strain rate is an order of 10^(-6). Orientation of principal compression axis is NE 50°, and orientation of principal extention axis is SE predominant. Annual strain value of the latter is more than that of the former.
出处
《地震地质》
EI
CSCD
北大核心
1990年第3期265-271,共7页
Seismology and Geology
关键词
现代构造
地壳形变
大地测量
华北
North China, Recent tectonic movement, Crustal deformation, Geodetie measurement
