首都圈断层活动性研究
A STUDY OF THE FAULT ACTIVITY IN THE CAPITAL CIRCLE
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摘要: 本文分析了首都圈47处监测断层活动性的大地形变测点资料,给出了各处断层现今活动情况及速率。研究认为,首都圈现今应力场受华北区域应力场的支配,活动剧烈的断层主要有:沿河城—南口山前断层、八宝山—黄庄—高丽营断层、南口—孙河断层;1987年之后断层活动平均速率上升到0.40mm/年,应力场处于加强过程;应力集中地段在黄庄—高丽营断层北端、沿河城—南口山前断层北端,狼山断层、怀来—涿鹿北缘断层近年活动剧烈,其北端也是应力加强地区;构造运动的活跃与地震活动同步,目前构造运动继续处于活跃状态。上述应力集中地段的地震危险性应予以重视。Abstract: 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.