汶川地震前后川滇块体应变与断裂变形特征研究
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摘要
利用1999—2007和2007—2009年GPS资料,采用块体变形模型和GPS速度剖面研究了川滇地区的分阶段变形特征,结果显示川西北-滇中-滇西南块体主压应变率方向由北向南呈顺时针方向旋转;安宁河断裂、则木河断裂存在剪切应变积累,小江断裂南段以走滑为主、北段以应变积累为主;汶川地震对丽江-小金河断裂中南段、安宁河断裂和金沙江断裂有一定影响,对则木河断裂、小江断裂和红河断裂的影响较小。
Using the GPS velocity field data during the periods of 1999—2007 and 2007—2009,we analyzed the deformation characteristics of the Sichuan-Yunnan region during the two periods with block deformation model and by analyzing the GPS velocity profiles.The results show that the direction of the principal compressive strain rate of the west-northern segment of Sichuan block-the middle segment of Yunnan block-the west-southern segment of Yunnan block is characterized by clockwise rotation from north to south.The Anninghe fault and the Zemuhe fault have some shear strain accumulation,and the southern segment of Xiaojiang fault is mainly strike-slip,but its northern segment is mainly accumulating strain.The earthquake had relatively obvious influence on the medium-southern segment of Lijiang-Xiaojinhe fault,the Anninghe fault and the Jinshajiang fault,meanwhile it affected the Zemuhe fault,the Xiaojiang fault and the Honghe fault less.
Using the GPS velocity field data during the periods of 1999—2007 and 2007—2009,we analyzed the deformation characteristics of the Sichuan-Yunnan region during the two periods with block deformation model and by analyzing the GPS velocity profiles.The results show that the direction of the principal compressive strain rate of the west-northern segment of Sichuan block-the middle segment of Yunnan block-the west-southern segment of Yunnan block is characterized by clockwise rotation from north to south.The Anninghe fault and the Zemuhe fault have some shear strain accumulation,and the southern segment of Xiaojiang fault is mainly strike-slip,but its northern segment is mainly accumulating strain.The earthquake had relatively obvious influence on the medium-southern segment of Lijiang-Xiaojinhe fault,the Anninghe fault and the Jinshajiang fault,meanwhile it affected the Zemuhe fault,the Xiaojiang fault and the Honghe fault less.
引文
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5李延兴,等.板内块体的刚性弹塑性运动模型与中国大陆主要块体的应变状态[J].地震学报,2001,23(6):
565-572.(Li Yanxing,et al.The rigid and elastic-plasticmodel of the blocks in intro-plate and strain status of princi-pal blocks in the continent of China[J].Acta SeismologicaSinica,2001,23(6):565-572)
6李延兴,等.中国大陆及周边地区的水平应变场[J].地球物理学报,2004,47(2):222-231.(Li Yanxing,etal.Horizontal strain field in the Chinese mainland and itssurrounding areas[J].Chinese J Geophys.,2004,47(2):222-231)
2吕江宁,沈正康,王敏.川滇地区现代地壳运动速度场和活动块体模型研究[J].地震地质,2003,25(4):543-554.(LüJiangning,Shen Zhengkang and Wang Min.Contemporary crustal deformation and active tectonic blockmodel of the Sichuan-Yunnan region,China[J].Seismologyand Geology,2003,25(4):543-554)
3 Shen Z K,et al.Contemporary crustal deformation around thesoutheast borderland of the Tibetan Plateau[J].Journal ofGeophysical Research,2005,110(B11409),doi:10.1029/2004JB003421.
4王阎昭,等.基于GPS资料约束反演川滇地区主要断裂现今活动速率[J].中国科学(D辑),2008,38(7):582-597.(Wang Yanzhao,et al.GPS-constrained inversion ofpresent-day slip rates along major faults of the Sichuan-Yun-nan region,China[J].Science in China(Series D),2008,38(7):582-597)
5李延兴,等.板内块体的刚性弹塑性运动模型与中国大陆主要块体的应变状态[J].地震学报,2001,23(6):
565-572.(Li Yanxing,et al.The rigid and elastic-plasticmodel of the blocks in intro-plate and strain status of princi-pal blocks in the continent of China[J].Acta SeismologicaSinica,2001,23(6):565-572)
6李延兴,等.中国大陆及周边地区的水平应变场[J].地球物理学报,2004,47(2):222-231.(Li Yanxing,etal.Horizontal strain field in the Chinese mainland and itssurrounding areas[J].Chinese J Geophys.,2004,47(2):222-231)
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