摘要
利用2010年和2013年两期精密水准测量数据分析了芦山Ms7.0地震前龙门山断裂带西南段的区域形变特征。结果显示,芦山地震前龙门山断裂带西南段的天全-泸定区域垂直形变速率为6~8mm/a,远大于汶川地震前的形变速率,汶川地震对芦山地震前该区域库伦应力值的积累起加速作用;临近四川盆地的雅安至名山区域的垂直形变速率为-3^-6mm/a。从芦山地震和汶川地震的地震破裂带及余震分布区域来看,两次地震中间出现一段"地震空区",应力可能会在空区加速积累,应加强该区域地震监测和预报。
The regional deformation characteristics of the southwestern segment of Longmen Mountain Fault Zone before the Lushan Ms7. 0 earthquake were analyzed by using the precise re-leveling data in 2010 and 2013. The results indicate that the vertical deformation rate of the Tianquan-Luding area in the southwestern part of the Longmen Mountain Fault Zone was 6-8 mm /a,which was far higher than that of this region before the Wenchuan Ms8. 0 earthquake. The Wenchuan Ms8. 0 earthquake accelerated accumulation of the Coulomb stress value in the research area before occurrence of Lushan Ms7. 0 earthquake. The vertical deformation rate of the Ya'an-Mingshan area close to the Sichuan Basin was --3 --6 mm/a. In terms of the rupture zone and aftershock distribution induced by the Lushan earthquake and Wenchuan earthquake, a "seismic gap" between two earthquakes might accelerate stress accumulation. Therefore, monitoring the "seismic gap" and earthquake prediction should be strengthened.
作者
徐东卓
焦守涛
朱传宝
孙非非
管见
尹海权
XU Dongzhuo JIAO Shoutao ZHU Chuanbao SUN Feifei GUAN Jian YIN Haiquan(First Crust Monitoring and Application Center, CEA, Tianjin, 300180, China School of Earth Sciences and Engineering, SUN YAT--SEN University ,Guangzhou,Guangdong,510275 ,China Institute of Geology and Mineral Exploration of Qinghai Province, Xining,Qinghai, 810029, China)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2017年第10期2175-2184,共10页
Acta Geologica Sinica
基金
科技部基础性工作项目(编号:2015FY210400)
中国地震局"三结合"项目(编号:CEA-JC/3JH-163704)联合资助的成果
关键词
芦山地震
龙门山断裂带
精密水准
形变分析
发震模型
Lushan earthquake
Longmen Mountain Fault Zone
Precise re-leveling data
Deformation analysis
Earthquake model