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Title:: Movement Character and Deformation Anomaly Research of Dushanzi-Anjihai Fault Nowadays

作者:: 刘冠中¹; 王建军¹; 王在华²; 蒋靖祥²; 谢周敏¹; 陈兆亮³; (1.中国地震局地壳应力研究所,北京 100085; 2.新疆维吾尔自治区地震局,乌鲁木齐 830011; 3.新疆伊犁州地震局奎屯地震台,新疆奎屯 833200)

Author(s):: LIU Guan-zhong¹; WANG Jian-jun¹; WANG Zai-hua²; JIANG jing-xiang²; (1.Institute of Crustal Dynamics,China Seismological Bureau,Beijing 100085,China)(2.Seismological Bureau of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)(3.Kuitun Seismostation,Earthquake Administration of Xinjiang Yili Prefecture,Kuitun 833200,Xinjiang,China)

Keywords:: Across-fault deformation observation; Micro-displacement; Principal stress's direction; Preliminary anomaly; Dushanzi-Anjihai fault

摘要:: 利用新疆独山子台跨断层形变观测资料,对独山子山前断层的活动速率、活动特征及区域应力场进行了分析,结合震源机制解的研究成果进行了对比验证,同时应用“速率累加”分析方法进行了异常提取。结果显示:① 独山子—安集海断裂垂直位移年平均变化量为0.106 mm,沿基线方向的水平位移年平均变化量为0.189 mm,沿断层走向的水平走滑年平均变化量为-0.883 mm,断层活动以右旋走滑为主兼具逆冲分量; ② 1993～2007年独山子断层的最大水平主压应力方向在339.85°～346.78°之间,平均为344.23°; ③ 乌苏5.1级地震前,独山子台的形变记录曲线有较明显的速率异常变化与同震形变波动。

Abstract:: Using the cross-fault deformation data from Dushanzi station,this paper makes a preliminary analysis on movement rate,movement character and regional tectonic stress field of Dushanzi-Anjihai fault,and compares with the results of focal mechanism solutions for verification.The result shows that:(1)The nowadays movement of Dushanzi-Anjihai fault is characterized by right-lateral thrust motion,the average annual change of vertical movement is 0.106mm,the average annual change of horizontal movement is 0.189mm,and the average annual change of right-lateral slipping movement is -0.883mm.(2)The direction of maximum principal stress is between 339.35° and 346.78°,the average is 344.23°.(3)Dushanzi deformation station recorded preliminary anomaly and co-seismic variation before the WuSu M_S5.1 earthquake。