A Discussion on Fault Activity Based on Cross-fault Observations in the Capital Circle Region of China and Its Relationship with Earthquakes  

作　　者：Li Layue Xing Chengqi Wu Anxu Liu Xinzhong Hu Leyin 

机构地区：[1]Institute of Earthquake Science, China Earthquake Administration [2]Earthquake Administration of Beijing Municipality [3]The First Institude of Oceanography

出　　处：《Earthquake Research in China》2013年第1期52-66,共15页中国地震研究（英文版）

基　　金：sponsored by the Special Foundation of China Earthquake Administration(HBA2);Beijing Nature and Science Foundation(8022009);Spark Program of Earthquake Sciences(XH12001);Youth Seismic Condition Tracking Subject from China Earthquake Administration(2012020201)

摘　　要：In this paper, we made a systematic study on more than 40 years of observational data 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 extension or compression components. 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 earthquakes. The results show the complexity of fault activity in the region： the level of activity of all faults is low, most faults are left-lateral strike-slip faults; there is less vertical activity than horizontal activity and crustal movement is controlled by horizontal movement; fault activity and earthquake activity have a certain relationship, regional fault activity increases before an earthquake, and fault activity has certain abnormal features before strong earthquakes.In this paper, we made a systematic study on more than 40 years of observational data of ten temporary fault-crossing measurement sites in the capital circle region of China. We calculated horizontal and vertica1 components of fault slip, and horizontal extension or compression components. 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 earthquakes. The results show the complexity of fault activity in the region: the level of activity of all faults is low, most faults are left-lateral strike-slip faults; there is less vertical activity than horizontal activity and crustal movement is controlled by horizontal movement; fault activity and earthquake activity have a certain relationship, regional fault activity increases before an earthquake, and fault activity has certain abnormal features before strong earthquakes.

关 键 词：Capital circle region Cross-fault measurement Fault activity Earthquakeactivity 

分 类 号：P315.6[天文地球—地震学]