首都圈跨断层形变反映的断层活动方式及其成因探讨  

Fault Activities and Their Geodynamic Cause Derived from Cross-fault Observation in the Capital Region of China

作　　者：曹建玲[1] 张晶[1] 王辉[1] 方颖[1] 

机构地区：[1]中国地震局地震预测研究所,北京100036

出　　处：《地震》2011年第4期77-85,共9页Earthquake

基　　金：科技部国际合作项目(2010DFB20190);中国地震局地震预测研究所基本科研业务费专项(02092431)资助

摘　　要：本文深入分析了首都圈10个跨断层形变场地的流动观测资料,计算了断层水平滑动量。结果表明,首都圈断层形变反映的断层活动非常复杂。其中:NW走向的施庄断裂左旋滑动量与时间呈线性关系,在观测期内左旋滑动速率约为0.08mm/a;NW走向的墙子路断裂观测期内以左旋滑动为主,但水平滑动量较施庄断裂小;NE走向的断层在观测期内的活动方式多以左旋滑动为主,水平滑动量随时间无明显变化规律。在对断层活动观测结果详细分析的基础上,利用平面弹性有限元模型对首都圈的断层活动进行了模拟研究,认为该地区主要受张家口—渤海构造带左旋剪切的控制,且不同走向活动断层以左旋走滑为主。Temporary cross-fault observation data in the past tens years in the capital region of China is studied in the paper.Distribution of fault strike-slips indicates the complexity of fault activities in the region.Left-lateral strike-slip of the Shizhuang fault,that trending northwest,is positively correlated with time.The mean left-lateral strike-slip rate on the fault is about 0.08 mm/a during the observing period.Left-lateral strike-slip of the Qiangzhilu fault,that is also trending northwest,is less than that of the Shizhuang fault.The northeast trending faults in the capital region are also mainly left-lateral strike-slip faults.Strike-slip on these faults are not clearly correlated with time.Based on studies on fault activities,the regional plane elastic finite element model is constructed to simulate fault activities in the capital region.The simulated results show that fault activities in the capital region are controlled by the left-lateral Zhangjiakou-Bohai zone.Faults with different trendings in the capital region are mainly left-lateral strike-slip faults.

关 键 词：跨断层观测 断层活动 数值模拟 首都圈 

分 类 号：P315.7[天文地球—地震学]