| 昆仑Ms 8.1地震前青藏块体北、东缘水平运动变形的关联特征 |
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| 引用本文： | 王双绪,张希,张晓亮.昆仑Ms 8.1地震前青藏块体北、东缘水平运动变形的关联特征[J].中国地震,2005,21(1):41-49. |
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| 作者姓名： | 王双绪 张希 张晓亮 |
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| 作者单位： | 中国地震局第二监测中心,西安市西影路316号,710054 |
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| 基金项目： | 地震科学联合基金课题104011、603001和603002共同资助. |
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| 摘 要： | 青藏块体东北缘和川滇GPS监测区1991(1993)、1999和2001年高精度GPS观测资料揭示：2001年11月14日昆仑Ms8．1地震前，青藏块体北、东缘构造区域水平运动变形场动态演变具有一定的关联性特征。即：在继承性运动总体背景下，临近大震发生时两区域运动强度同步减弱且变形状态发生变化。结合地质构造分析研究认为，昆仑Ms8．1地震前，青藏块体边界运动变形的关联性变化与大震孕育后期大范围应力应变快速积累所形成的扰动应力场有关；随着块体内部大震的发生、应变能的大量释放和构造应力场的调整，可能会促使块体边界地带具有较高应变积累的相关构造部位(尤其是未被历史强震破裂贯通的地带)的应力应变的进一步积累或破裂释放。
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| 关 键 词： | 昆仑Ms8．1地震 青藏块体边界 水平运动变形 关联性特征 |
| 文章编号： | 1001-4683(2005)01-041-09 |
Connected Features of Horizontal Movement and Deformation in The Northern and Eastern Margins of the Qinghai-Xizang Block Before the Kunlun Ms 8.1 Eathquake |
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| Wang Shuangxu,Zhang Xi,Zhang Xiaoliang.Connected Features of Horizontal Movement and Deformation in The Northern and Eastern Margins of the Qinghai-Xizang Block Before the Kunlun Ms 8.1 Eathquake[J].Earthquake Research in China,2005,21(1):41-49. |
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| Authors: | Wang Shuangxu Zhang Xi Zhang Xiaoliang |
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| Institution: | Wang Shuangxu Zhang XiZhang Xiaoliang The Second Monitoring Center,CEA,Xi'an 710054,China |
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| Abstract: | It is revealed by GPS observation data of the northeastern margin of the Qinghai-Xizang block and the Sichuan-Yunnan area in 1991(1993),1999 and 2001 that: Before the Kunlun M S8.1 earthquake on Nov. 14 of 2001, the dynamic horizontal movement and deformation of the northern and eastern margin of Qinghai-Xizang block had connected features to some degree. That is, the deformation intensity of these two tectonic areas weakened just before the earthquake. Combined with analysis of geological tectonics, it concluded that, the connected variation of regional deformation of block boundary before the M S 8.1 earthquake inside the Qinghai-Xizang block, related to disturbance stress field caused by large-range accelerated accumulation of stress-strain when the huge earthquake was developed inside the block; with the release of strain energy of huge earthquake and adjustment of tectonic stress field inside the block, relevant tectonic position of high strain accumulation along block boundary (especially the belt which hasn't ever been linked up by fractures of historical strong earthquakes) may be stimulated accumulation of stress-strain or rupture. |
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| Keywords: | Kunlun M S 8 1 earthquake Boundary of the Qinghai-Xizang block Horizontal movement and deformation Connected features |
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