汶川地震前后川滇及其邻区GPS水平运动演化特征
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摘要
利用川滇及其邻区2004-2007年、2007-2009年GPS水平运动观测资料,对汶川地震前、震时与震后地壳运动及主要活动断裂带构造变形演化特征、汶川地震可能的同震与震后影响进行了分析。结果表明:2007-2009年汶川震区呈现出显著的右旋逆冲同震变形;大震在一定程度上对甘川交界及其北侧的西秦岭构造区、安宁河—则木河断裂的构造运动有所促进;对鲜水河断裂构造运动总体反映调整影响但对其南段可能有促进作用。
Based on the horizontal velocity data observed by GPS during 2004-2007 and 2007-2009,before and after the Wenchuan earthquake,in Sichuan-Yunnan region and adjacent area,the tectonic deformation evolution features of the crust and main active fault belts,and possible influence from the Wenchuan great earthquake,are analyzed.The result shows that the Wenchuan earthquake area showed obvious co-seismic thrust and dextral deformation during the period of 2007-2009.The earthquake,in a certain extent,promoted tectonic movements in Gansu-Sichuan boundary area,as well as West Qinling Mountain area and Anninghe-Zemuhe faults.Meanwhile,impacted tectonic movement on Xianshuihe fault with adjustment overall but may increase the southern section of it.
Based on the horizontal velocity data observed by GPS during 2004-2007 and 2007-2009,before and after the Wenchuan earthquake,in Sichuan-Yunnan region and adjacent area,the tectonic deformation evolution features of the crust and main active fault belts,and possible influence from the Wenchuan great earthquake,are analyzed.The result shows that the Wenchuan earthquake area showed obvious co-seismic thrust and dextral deformation during the period of 2007-2009.The earthquake,in a certain extent,promoted tectonic movements in Gansu-Sichuan boundary area,as well as West Qinling Mountain area and Anninghe-Zemuhe faults.Meanwhile,impacted tectonic movement on Xianshuihe fault with adjustment overall but may increase the southern section of it.
引文
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[2]江在森,马宗晋,张希,等.GPS初步结果揭示的中国大陆水平应变场与构造变形[J].地球物理学报,2003,46(3):352-358.
[3]丁国瑜,卢演俦.中国岩石圈动力学概论[M].北京:地震出版社,1991:142-153.
[4]邓起东,张培震,冉永康,等.中国活动构造基本特征[J].中国科学D辑,2002,32(12):1020-1030.
[5]张希,崔笃信.蒋锋云.基于GPS观测的汶川地震参数反演与库仑应力变化分析[J].地震研究,2009,32(4):351-356.
[6]张希,崔笃信.王文萍,等.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,2008,31(增刊):464-470.
[7]张希,江在森.南北地震带中南段地壳运动负位错反演与汶川等地震背景[J].西北地震学报,2010,32(2):105-111.
[8]王卫民,赵连锋,李娟,等.四川汶川MS8.0级地震震源过程[J].地球物理学报,2008,51(5):1403-1410.
[9]中国地震局监测预报司编著.汶川8.0级地震科学研究报告[M].北京:地震出版社,2008:21,39.
[10]万永革,沈正康,盛书中,等.2008年汶川大地震对周围断层的影响[J].地震学报,2009,31(2):128-139.
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