首都圈断层活动及其与地震关系探讨

Fault activities based on fault-crossing observation in the Capital Circle Region of China and its relationship with earthquakes

摘要:

对首都圈地区10处跨断层流动观测场地40多年来的观测资料进行了系统研究,计算了断层水平扭错量、水平张压量和垂直升降量。结合首都圈地区地质构造特征和该区1970年以来的区域地震活动特征,分析了首都圈地区现今断层活动特征及其与地震的关系。结果表明,首都圈地区断层活动较复杂,目前总体活动水平与往期相比并不高,大多数断层左旋活动增强,右旋活动相对减弱;张性活动也有逐渐增强的趋势;断层垂直活动量小于水平活动量,地壳运动仍以水平运动为主;断层活动与地震活动存在一定的关系,强震前断层活动明显增强,并具有一定的异常特征。

Abstract:

In this paper, we made a systematic study on observational data of more than 40 years of ten temporary fault-crossing measurement sites in the Capital Circle Region of China. We calculated horizontal and vertical components of fault slip, and horizontal tension or compression component. Considering the tectonic characteristics of the Capital Circle Region and regional seismicity, we analyzed the present fault activity of the Capital Circle Region and the relationship with earthquake. The results show the complexity of fault activities in the region： the level of activity of all faults is low; most faults are mainly left-lateral strike-slip faults; vertical activity is less than the level of activity and crustal movement is still controlled by horizontal movement; fault activity and earthquake activities have a certain relationship, regional fault activity strengthens before the earthquake and fault activity has certain abnormal features before the strong earthquakes.[著者文摘]