鲜水河断裂带现今活动特征研究  

ON PRESENT ACTIVITY CHARACTERISTICS OF XIANSHUIHE FAULT ZONE

作　　者：杨永林[1] 苏琴[2] 

机构地区：[1]成都理工大学,成都610059 [2]四川省地震局测绘工程院,雅安625000

出　　处：《大地测量与地球动力学》2007年第6期22-27,共6页Journal of Geodesy and Geodynamics

摘　　要：利用鲜水河断裂带多个跨断层形变场地20余年的测量资料,分析了该断层的活动特征;结合沿断裂带强震破裂的时空信息,对不同断裂部位的现今构造活动特性进行了比较。结果发现该断裂带现今形变活动的空间分段性显著:北西段为偏张性左旋走滑运动,中段为偏压性左旋走滑运动,南东段则以张性左旋走滑运动为主。各场地的断层活动量随时间推移逐步减小,反映出断裂带正向闭锁的趋势演化。Along the faults of Xianshuihe several fault-crossing measurement sites were set up and the observations has been carried out for more than 20 years, Combining with the spatial-temporal seismic fracture information along the faults,the present tectonic activity characteristics in the differen segments of the fault are compared with each other. It shows that the different segments of the fault present the different active characteristics. The northwestern segment of the fault is of left-lateral strike-slip, the middle segment is of left-lateral strike-slip with the tendency of reverse fault and the north-eastern segment is of left-lateral strike-slip with the tendency of normal fault. All the active amounts of every segments decrease with the time and these characteristics imply that the fault zone here is getting locked.

关 键 词：鲜水河断裂带 跨断层形变测量 断层活动分段性 应变积累 强震危险区段 

分 类 号：P315.2[天文地球—地震学]