利用水准测量数据分析芦山M_S7.0地震前龙门山断裂带南段应变积累  

Analysis on Strain Accumulation in the Southern Segment of Longmenshan Fault Belt before Lushan M_S7.0 Earthquake Inferred from Leveling Data

作　　者：宋成科[1] 李腊月[1] 孟庆筱[1] 郑宇[1] 管见 夏峰[1] 周海涛[1] 李进武[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《地震研究》2015年第2期237-241,333,共5页Journal of Seismological Research

基　　金：中国地震局地震研究所所长基金(IS201366007);中国地震局第一监测中心主任基金(FMC2014001)联合资助

摘　　要：利用2010年和2013年两期一等水准测量数据分析了龙门山断裂带南段芦山MS7.0地震前的应变积累。结果表明：（1）汶川地震的发生明显加速了该区域应变积累的过程,龙门山断裂带南段主要断层区域垂直形变速率为6-9 mm/a,表明汶川地震的发生加速了此次芦山地震的孕育过程;靠近鲜水河断裂带区域垂直形变速率为1-5 mm/a,低于汶川地震前的隆升速度。（2）芦山地震并未释放该区域长期积累的应变能,龙门山断裂带南段仍然具有发生破坏性地震的可能。The strain accumulation in the southern segment of Longmenshan Fault Belt before the Lushan Ms7.0 earthquake was analyzed by using first-order leveling data in 2010 and 2013. The results show that： （ 1 ） The occurrence of Wenchuan Ms8.0 earthquake obviously accelerated the strain accumulation of the study area, and the vertical deformation rate was 6 - 9 mm/a in main faults zone of the southern segment of Longmenshan Fault Belt, which indicated that the occurrence of Wenchuan Ms8.0 earthquake accelerated the preparation process of Lushan Ms7.0 earthquake. The vertical deformation rate was 1 - 5 mm/a in the area near the Xianshuihe Fault Belt, which was lower than the uplift velocity before Wenchuan Ms8.0 earthquake. （2） The long-term accumulative strain energy was not released by Lushan Ms7.0 earthquake in the study zone, and it still had the risk to occur the destructive earthquake in the southern segment of Longmenshan Fault Belt in the future.

关 键 词：应变积累 水准测量 龙门山断裂带南段 芦山MS7.0地震 

分 类 号：P315.72[天文地球—地震学]