地形变观测揭示的汶川Ms8.0级地震同震响应与影响
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摘要
利用GPS、跨断层长水准、跨断层短水准与基线等多手段、不同时空尺度地形变观测资料,研究了2008年5月12日四川汶川县Ms8.0级地震同震响应及对周围地区的影响。分析表明了汶川地震发震区呈相当显著的逆冲兼右旋走滑同震变化,大震对其附近的甘川交界东段——甘川陕交界区、鲜水河断裂南段及与龙门山断裂、安宁河断裂的Y字型交汇区及其附近影响相对明显,对其应变积累可能以一定程度增强作用为主。
Using crustal deformation observation data with diverse space-time scale,including GPS,long-leveling cross-fault,short-leveling and short-baseline cross-fault,the coseismic response of the Wenchuan Ms8.0 earthquake on 12 May 2008 and its influence on neighborhood are researched.The analysis shows that,the earthquake region displayed remarkable coseismic deformation of thrust and dextral slip,this great earthquake obviously effected the region from eastern segment of boundary between Gansu and Sichuan province to boundary where Gansu,Sichuan and Shaanxi meet,and the southern segment of Xianshuihe fault and the Y-character region where it meet Longmenshan fault and Anninghe fault,mainly reflecting possible enhanced action for strain accumulation,to some degree.
Using crustal deformation observation data with diverse space-time scale,including GPS,long-leveling cross-fault,short-leveling and short-baseline cross-fault,the coseismic response of the Wenchuan Ms8.0 earthquake on 12 May 2008 and its influence on neighborhood are researched.The analysis shows that,the earthquake region displayed remarkable coseismic deformation of thrust and dextral slip,this great earthquake obviously effected the region from eastern segment of boundary between Gansu and Sichuan province to boundary where Gansu,Sichuan and Shaanxi meet,and the southern segment of Xianshuihe fault and the Y-character region where it meet Longmenshan fault and Anninghe fault,mainly reflecting possible enhanced action for strain accumulation,to some degree.
引文
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[2]张希,江在森,王琪,等,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,2005,27(6):620-629
[3]马杏垣.中国岩石圈地球动力学地图集[M].北京:中国地图出版社,1989:17;49;53-55
[4]唐文清,陈智梁,刘宇平,等.青藏高原东缘鲜水河断裂与龙门山断裂交会区现今的构造活动[J].地质通报,2005,24(12):1 169-1 172
[5]张希,江在森,王双绪,等.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,2005,28(2):119-124
[6]张希,江在森.对华北GPS监测区近期地壳应变连续分布的估计[J].地震学刊,1999,75(2):57-62
[7]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
[8]张希,刘文义、王双绪,等.西北地区近期地壳水平运动与构造变形特征[J].中国地震,2006,22(1):43-55
[9]方颍,江在森,牛安福.川滇菱形块体东边界地壳形变研究[J].大地测量与地球动力学,2005,25(3):81-85
[10]丁开华,许才军.川滇地区地壳应变场的GPS与地震矩张量联合反演研究[J].武汉大学学报.信息科学版,2009,34(3):265-268
[11]独知行,刘经南.利用GPS位移和主应力方向观测资料进行川滇地区边界力的联合反演研究[J].武汉大学学报.信息科学版,2003,28(2):162-166
[12]何宏林,池田安隆.安宁河断裂晚第四纪运动特征及模式的讨论[J].地震学报,2007,29(5):537-548
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