基于GPS观测的汶川地震参数反演与库仑应力变化分析
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摘要
利用汶川MS8.0地震前后的GPS观测资料,借助Okada矩形位错模型反演汶川地震参数,进而应用反演所得地震参数,计算地震在其周围GPS资料负位错反演所得震前应变积累断层段上可能造成的库仑破裂静应力变化,分析地震对其周围构造断裂应变积累的影响。结果表明,汶川震区呈显著逆冲兼右旋走滑同震变化,对甘川交界东段—甘川陕交界区、鲜水河断裂南段与安宁河断裂北端应变积累有一定程度影响,可能以增强作用为主。
In this paper,using the GPS observational data before and after the great Wenchuan earthquake on 12 May 2008,aided by rectangle dislocation model,the seismic parameters of this earthquake are obtained.Applying these parameters,the variation of Coulomb rupture static stress caused by this earthquake,is acted on its peripheral fault segments reflecting strain accumulation,before this earthquake revealed by the inversion of negative dislocation from GPS data.The influences of this great earthquake on strain accumulation of peripheral tectonic faults are researched.The result shows that,this earthquake region displayed remarkable co-seismic deformation of thrust and dextral slip.This great earthquake affected the eastern boundary where Gansu and Sichuan provinces meet and the boundary where Gansu,Sichuan and Shaanxi provinces meet,together with the southern segment of Xianshuihe fault and the northern end of Anninghe fault,to some degree,mainly reflecting possible enhanced action for strain accumulation.
In this paper,using the GPS observational data before and after the great Wenchuan earthquake on 12 May 2008,aided by rectangle dislocation model,the seismic parameters of this earthquake are obtained.Applying these parameters,the variation of Coulomb rupture static stress caused by this earthquake,is acted on its peripheral fault segments reflecting strain accumulation,before this earthquake revealed by the inversion of negative dislocation from GPS data.The influences of this great earthquake on strain accumulation of peripheral tectonic faults are researched.The result shows that,this earthquake region displayed remarkable co-seismic deformation of thrust and dextral slip.This great earthquake affected the eastern boundary where Gansu and Sichuan provinces meet and the boundary where Gansu,Sichuan and Shaanxi provinces meet,together with the southern segment of Xianshuihe fault and the northern end of Anninghe fault,to some degree,mainly reflecting possible enhanced action for strain accumulation.
引文
蔡明军,叶建庆.汶川8.0级地震余震特征参数与共震应力变化[J].地震研究,31(增刊):471-475.
陈化然,李轶群,马宏生,等.2003.基于断层相互作用理论的强震成组孕育发生初步研究[J].地震,23(3):51-56.
陈运泰,许力生,张勇,等.2008.初步研究及考察成果(一)2008年5月12日汶川特大地震震源特性分析报告.http://www.csi.ac.cn/sichuan/chenyuntai.pdf.
邓起东,张培震,冉勇康,等.2002.中国活动构造基本特征[J].中国科学(D辑),32(12):1020-1030.
韩竹军,谢富仁,万永革.2003.断层间相互作用与地震触发机制的研究进展[J].中国地震,19(1):67-76.
马杏垣.1989.中国岩石圈地球动力学图集[M].北京:中国地图出版社.
万永革,沈正康,盛书中,等.2009.2008年汶川大地震对周围断层的影响[J].地震学报,31(2):128-139.
万永革,吴忠良,周公威,等.2002.地震应力触发研究[J].地震学报,24(5):533-551.
王卫民,赵连锋,李娟,等.2008.四川汶川MS8.0级地震震源过程[J].地球物理学报,51(5):1403-1410.
徐锡伟,闻学泽,叶建青,等.2008.汶川MS8.0地震地表破裂带及其发震构造[J].地震地质,30(3):597-629.
张希,崔笃信,王文萍,等.2008.利用GPS资料分析汶川地震前后川滇及其邻区水平运动及应变积累[J].地震研究,31(增刊):464-470.
张希,江在森,王琪,等.2005a.青藏块体东北缘弹性块体边界负位错反演与强震地点预测[J].地震学报,27(6):620-629.
张希,江在森,王双绪,等.2005b.川滇地区地壳水平运动的弹性块体边界负位错模型与强震地点预测[J].地震研究,28(2):119-124.
中国地震局监测预报司.2008.汶川8.0级地震科学研究报告[M].北京:地震出版社.
J iC,Hayes G.2008.Preliminary result of the May12,2008MW7.9eastern Sichuan,China earthquake,http://earthquake.usgs.gov/eqcenter/eqinthenews/2008/us2008ryan/fi-nite_fault.php.
M a tsu ura M,Jackson D D,Cheng A.1986.Dislocation model for aseis-mic crustal deformation at Hollister,California[J].J of Geophys-ical Research,91(B12):12,661-12,674.
O k ada Y.1985.Surface deformation due to shear and tensile faults in ahalf-space[J].Bulletin of the Seismological Society of America,75(4):1135-1154.
O k ada Y.1992.Internal deformation due to shear and tensile faults in ahalf-space[J].Bulletin of the Seismological Society of America,82(2):1018-1040.
S h en Z K,Sun J,Zhang P,et al.2009.Arare and unusual event:De-formation and slip of the12May2008Wenchuan earthquake.(Submitted to Nature Geoscience).
T od a S,Lin J,Meghraoui M,et al2008.12May2008M=7.9Wen-chuan,China,earthquake calculated to increase failure stress andseismicity rate on three major fault systems[J].Geophys ResLett,35,L17305,doi:10.1029/2008GL034903.
陈化然,李轶群,马宏生,等.2003.基于断层相互作用理论的强震成组孕育发生初步研究[J].地震,23(3):51-56.
陈运泰,许力生,张勇,等.2008.初步研究及考察成果(一)2008年5月12日汶川特大地震震源特性分析报告.http://www.csi.ac.cn/sichuan/chenyuntai.pdf.
邓起东,张培震,冉勇康,等.2002.中国活动构造基本特征[J].中国科学(D辑),32(12):1020-1030.
韩竹军,谢富仁,万永革.2003.断层间相互作用与地震触发机制的研究进展[J].中国地震,19(1):67-76.
马杏垣.1989.中国岩石圈地球动力学图集[M].北京:中国地图出版社.
万永革,沈正康,盛书中,等.2009.2008年汶川大地震对周围断层的影响[J].地震学报,31(2):128-139.
万永革,吴忠良,周公威,等.2002.地震应力触发研究[J].地震学报,24(5):533-551.
王卫民,赵连锋,李娟,等.2008.四川汶川MS8.0级地震震源过程[J].地球物理学报,51(5):1403-1410.
徐锡伟,闻学泽,叶建青,等.2008.汶川MS8.0地震地表破裂带及其发震构造[J].地震地质,30(3):597-629.
张希,崔笃信,王文萍,等.2008.利用GPS资料分析汶川地震前后川滇及其邻区水平运动及应变积累[J].地震研究,31(增刊):464-470.
张希,江在森,王琪,等.2005a.青藏块体东北缘弹性块体边界负位错反演与强震地点预测[J].地震学报,27(6):620-629.
张希,江在森,王双绪,等.2005b.川滇地区地壳水平运动的弹性块体边界负位错模型与强震地点预测[J].地震研究,28(2):119-124.
中国地震局监测预报司.2008.汶川8.0级地震科学研究报告[M].北京:地震出版社.
J iC,Hayes G.2008.Preliminary result of the May12,2008MW7.9eastern Sichuan,China earthquake,http://earthquake.usgs.gov/eqcenter/eqinthenews/2008/us2008ryan/fi-nite_fault.php.
M a tsu ura M,Jackson D D,Cheng A.1986.Dislocation model for aseis-mic crustal deformation at Hollister,California[J].J of Geophys-ical Research,91(B12):12,661-12,674.
O k ada Y.1985.Surface deformation due to shear and tensile faults in ahalf-space[J].Bulletin of the Seismological Society of America,75(4):1135-1154.
O k ada Y.1992.Internal deformation due to shear and tensile faults in ahalf-space[J].Bulletin of the Seismological Society of America,82(2):1018-1040.
S h en Z K,Sun J,Zhang P,et al.2009.Arare and unusual event:De-formation and slip of the12May2008Wenchuan earthquake.(Submitted to Nature Geoscience).
T od a S,Lin J,Meghraoui M,et al2008.12May2008M=7.9Wen-chuan,China,earthquake calculated to increase failure stress andseismicity rate on three major fault systems[J].Geophys ResLett,35,L17305,doi:10.1029/2008GL034903.
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