喜马拉雅东构造结附近强震对滇西南地区断层的影响研究  

Research on Influence of Strong Earthquakes nearby the Eastern Himalayan Syntaxis on Surrounding Faults in Southwest Yunnan

作　　者：孟令媛[1] 史海霞[1] 周龙泉[1] 

机构地区：[1]中国地震台网中心,北京100045

出　　处：《地震研究》2015年第1期58-65,181,共8页Journal of Seismological Research

基　　金：中国地震局地震科技星火计划青年项目(XH14055Y);国家自然科学基金(41404045);中国地震台网中心青年科技基金(QNJJPZ-YBB-1307);中国地震局监测预报司震情跟踪合同制定向工作任务(2013020106)联合资助

摘　　要：以在喜马拉雅东构造结发生的2000年6月7日缅甸MS6.9地震、2011年3月24日缅甸MS7.2地震和2012年11月11日缅甸MS7.0地震作为主要破裂源,计算3次地震震后周围应力的空间变化,给出其对滇西南地区断层造成的静态库仑应力变化的时间影响范围。结果表明:3次地震对滇西南地区活动断层库仑破裂应力变化主要为负值,即受到应力卸载的影响,其中包括大盈江断裂、龙陵—瑞丽断裂、南汀河西支断裂、南汀河东支断裂、孟连—澜沧断裂、打洛—景洪断裂和怒江断裂,量值范围在-0.06^-0.002 bar(1 bar=0.1 MPa),卸载影响最大的断裂为打洛—景洪断裂,为-0.06 bar,木嘎断裂和龙陵—澜沧断裂受到加载的影响,断层的库仑破裂应力分别为+0.002 bar和+0.004 bar。Taking the hypocenters of the Myanmar MS6. 9 earthquake on Jun. 7,2000,the M yanmar MS7. 2 earthquake on M ar. 24,2011,and the M yanmar MS7. 0 earthquake on Nov. 11,2012 which occurred nearby the Sagaing Fault in the Eastern Himalayan Syntaxis as the main rupture source,we estimated the spatial variation of the regional tectonic stress field after three earthquakes,and calculated the time range of the static Coulomb stress variation of the surrounding faults in Southw est Yunnan. This variation was induced by the three strong earthquakes. The results suggest that the Coulomb failure stress in Southw est Yunnan was negative because of the influence of the stress unloading. The Coulomb stress decreased on the Dayingjiang Fault,the Longling-Ruili Fault,the Western Nantinghe Fault,the Eastern Nantinghe Fault,the M englian-Lancang Nantinghe Fault,the Daluo-Jinghong and Nujiang Faults. The values ranged from- 0. 06 to- 0. 002 bar（ 1 bar = 0. 1 M Pa）. The largest decrease of the Coulomb stress on the Daluo-Jinghong Fault was 0. 06 bar. The increase on the M uga Fault was 0. 002 bar,on the Longling —Lancang Fault was 0. 004 bar,which was influenced by stress loading.

关 键 词：缅甸地震 喜马拉雅东构造结 库仑破裂应力 断层相互作用 

分 类 号：P315.727[天文地球—地震学]