2010年Mw 6.9级玉树地震同震库仑应力变化研究
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摘要
2010-04-14我国青海玉树附近发生Mw 6.9级地震。具体研究了该地震的前震-主震-余震序列应力触发模式及主震对周边断层的应力扰动。结果表明,大部分余震分布在同震库仑应力正区且余震触发率达76.4%;Mw 4.9级前震对Mw 6.9级主震的触发作用不甚明显,而后者对Mw 6.1级余震有明显触发作用;甘孜-玉树断层几乎都处于同震库仑应力加载状态,该断层上的历史破裂段如1738年M7.5级地震的当江段、哈秀段以及1896年M 7.3级地震的邓柯段未来更倾向于再次错动,造成强烈地震。
We here investigate the coseismic Coulomb stress change and seismicity rate induced by the 2010 Mw 6.9 Yushu earthquake in order to deepen our understanding of the behavior of stress triggering among its foreshock,mainshock and aftershocks and to further make an assessment of the occurrence of potential earthquakes in its surrounding region and on major active faults.Our results show that: 1) the pattern of aftershocks of the Mw 6.9 Yushu earthquake is consistent with the spatial distribution of coseismic Coulomb stress changes with an aftershock triggering rate of 76.47%;2)For this 2010 Yushu earthquake sequence of foreshock-mainshock-aftershock type,the Mw 4.9 foreshock has little contribution to the occurrence of the Mw 6.9 Yushu mainshock,whilst the triggering causality between the Mw 6.9 Yushu mainshock and the Mw 6.1 aftershock is well pronounced;3) the Coseismic Coulomb stress changes are loaded on the portions of Ganzi-Yushu fault such as the Dangjiang and Haxiu segments which have been ruptured by the 1738 M 7.5 earthquake and the Dengke segment of the 1896 M 7.3 earthquake as well as the southeastern unruptured extension from the end of the Mw 6.9 earthquake termination,and thus they all pose high earthquake hazards in the near future.
We here investigate the coseismic Coulomb stress change and seismicity rate induced by the 2010 Mw 6.9 Yushu earthquake in order to deepen our understanding of the behavior of stress triggering among its foreshock,mainshock and aftershocks and to further make an assessment of the occurrence of potential earthquakes in its surrounding region and on major active faults.Our results show that: 1) the pattern of aftershocks of the Mw 6.9 Yushu earthquake is consistent with the spatial distribution of coseismic Coulomb stress changes with an aftershock triggering rate of 76.47%;2)For this 2010 Yushu earthquake sequence of foreshock-mainshock-aftershock type,the Mw 4.9 foreshock has little contribution to the occurrence of the Mw 6.9 Yushu mainshock,whilst the triggering causality between the Mw 6.9 Yushu mainshock and the Mw 6.1 aftershock is well pronounced;3) the Coseismic Coulomb stress changes are loaded on the portions of Ganzi-Yushu fault such as the Dangjiang and Haxiu segments which have been ruptured by the 1738 M 7.5 earthquake and the Dengke segment of the 1896 M 7.3 earthquake as well as the southeastern unruptured extension from the end of the Mw 6.9 earthquake termination,and thus they all pose high earthquake hazards in the near future.
引文
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[3]Li Zhenhong,Elliott J R,Feng Wanpeng,et al.The 2010Mw 6.8Yushu(Qinghai,China)Earth-quake:Constraints Provided by InSAR and BodyWave Seismology[J].J Geophys Res,2011,116,B10302,doi:10.1029/2011JB008358
[4]闻学泽,徐锡伟,郑荣章,等.甘孜-玉树断裂的平均滑动速率与近代大地震破裂[J].中国科学(地球科学),2003,33(增刊):199-208
[5]Lin Aiming,Rao Gang,Dong Jia,et al.Co-seismicStrike-slip Surface Rupture and Displacement Pro-duced by the 2010Mw 6.9Yushu Earthquake,Chi-na,and Implications for Tibetan Tectonics[J].JGeody,2011,52:249-259
[6]程佳,刘杰,甘卫军,等.1997年以来巴彦喀拉块体周缘强震之间的黏弹性触发研究[J].地球物理学报,2011,54(8):1 997-2 010
[7]Shan Bin,Xiong Xiong,Zheng Yong,et al.TheCo-seismic Coulomb Stress Change and ExpectedSeismicity Rate Caused by 14April 2010 Ms=7.1Yushu,China,Earthquake[J].Tectonophys,2011,510:345-353
[8]王莹,吴小平,赵韬.震源参数因素对玉树地震库仑破裂应力图像及其与余震活动统计关系的影响[J].地震学报,2011,33(5):595-604
[9]USGS.Earthquake[OL].http://earthquake.usgs.gov/earthquakes/eqinthenews/2010/us2010vacp/#scitech,2012-04-10
[10]张勇,许力生,陈运泰.2010年4月14日青海玉树地震破裂过程快速反演[J].地震学报,2010,32(3):361-365
[11]刘超,许力生,陈运泰.2010年4月14日青海玉树地震快速矩张量解[J].地震学报,2010,32(3):366-368
[12]Globalcmt.ErikLarson[OL].www.globalcmt.org/CMTsearch.html,2010-04-10
[13]Xu Caijun,Wang Jianjun,Li Zhenhong,et al.Ap-plying the Coulomb Failure Function with an Opti-mally Oriented Plane to the 2008Mw 7.9WenchuanEarthquake Triggering[J].Tectonophys,2010,491(1/4):119-126
[14]袁道阳,雷中生,何文贵,等.1738年青海玉树地震考证及其与2010年玉树7.1级地震关系探讨[J].地球物理学进展,2011,26(6):1950-1958
[15]倪四道,王伟涛,李丽.2010年4月14日玉树地震:一个有前震的破坏性地震[J].中国科学(地球科学),2010,40(5):535-537
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