A STUDY OF THE FAULT ACTIVITY IN THE CAPITAL CIRCLE

This paper analzes the data of geodetic deformation from 47 stations which monitor the fault activity in the Capital circle, giving us the present active state and veolcity of fault in the places.We believe that the stress field in the Capital Circle is dominated by the North China stress field, the most active faults mainly are Yanhecheng-Nankou faulty Babaoshan-Huangzhuang-Gaoliying fault, Nankao-Sunhe fault.The average velocity of the fault activity rises to 0.40mm/year after 1987, and the stress field is in the intensive process.The stress concentration section is in the North of Huangzhuang-Gaoliying fault and the North of Yanhecheng-Nankou fault.Langshan and Huailai-Zhuoxian fault ac-trvity is strong in recent years and the north of both faults are also strong stress regions.The tectonic movements and earthquakes are synchronous and now tectonic movement continue to be in a active state.The earthquake risk of above stress concentration sections should be paid attention to.