川滇地区近期断层运动特征分析  

Analysis on the Recent Movement Characteristics of Faults in Sichuan-Yunnan Area

作　　者：贾鹏[1] 唐红涛[1] 李瑞莎[1] 张希[1] JIA Peng;TANG Hongtao;LI Ruisha;ZHANG Xi(The Second Monitoring and Application Center, CEA, Xi＇an 710054, Shaanxi, China)

机构地区：[1]中国地震局第二监测中心,陕西西安710054

出　　处：《地震研究》2018年第1期73-81,共9页Journal of Seismological Research

基　　金：中国综合地球物理场观测--大华北地区项目(201508009);地震科技星火计划项目(XH17061Y);中国地震局震情跟踪定向工作任务(2018010203)联合资助

摘　　要：通过对川滇地区的跨鲜水河断裂带、龙门山断裂带等多条重要断裂的形变资料进行了速率合成计算,并对这些场地的短水准和短基线在芦山地震、汶川地震等几次强震前后速率合成结果和张压趋势变化进行分析,最后结合2011—2015年川滇地区GPS资料的面膨胀计算结果进行了对比,总结该地区近年活动形变特征。结果表明:(1)大多数断裂保持正常幅度的张、压变化,而在地震前1~3年的变化幅度会明显异于常年;(2)可能的地震前异常变化在短水准和短基线形变中反映并不完全一致;(3)大地震后会对该地区及其附近的构造应力场产生深远影响,加快断层的运动速率。We calculated the synthetic rate of cross-fault deformation curves in Xianshuihe fault zone,Longmenshan fault zone etc. and analyzed the tension trend before and after the Lushan earthquake,Wenchuan earthquake etc. Moreover,the surface expansion that was derived from 2011—2015 GPS data was compared to study the characteristics of deformation activity in Sichuan-Yunan area in recent years. The results show that：（ 1） The velocity of most faults keep change of tension and pressure low in the normal range,while higher obviously in 1～ 3 years before earthquakes.（ 2） The possible precursory may not be shown in the baselines and leveling results simultaneously.（ 3） There will be a significant impact on the tectonic stress field in the study area after a large earthquake,which will accelerate the activity of adjacent faults.

关 键 词：速率合成 川滇地区 跨断层形变 地震 断裂带 

分 类 号：P315.2[天文地球—地震学]