| 玉树MS7.1级地震前的形变应变场变化特征 |
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| 引用本文： | 郭良迁,薄万举,杨国华,胡新康,郭赫,陈长云.玉树MS7.1级地震前的形变应变场变化特征[J].地球物理学报,2011,54(8):1990-1996. |
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| 作者姓名： | 郭良迁 薄万举 杨国华 胡新康 郭赫 陈长云 |
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| 作者单位： | 中国地震局第一监测中心,天津 300180 |
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| 基金项目： | 天津市应用基础研究(08JCZDJC18900)和中国地震局"全国地震区划图编制项目"资助. |
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| 摘 要： | 基于1999～2007年和2007～2009年的GPS站点观测数据计算的速度场,分析了青藏亚板块的运动特征.利用块体(旋转与线性应变)弹性运动公式计算可可西里-巴颜喀拉块体和羌唐块体的应变率、可可西里-玉树断裂带的运动速度和应变率,研究了玉树7.1级地震前的形变应变特征.结果表明:可可西里-巴颜喀拉块体处于青藏亚板块运...
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| 关 键 词： | GPS运动场 块体运动 断裂带活动 应变率增加 玉树地震孕育 |
| 收稿时间： | 2010-08-12 |
The variation of the deformation-strain field before Ms7.1 Yushu earthquake |
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| GUO Liang-Qian,BO Wan-Ju,YANG Guo-Hua,HU Xin-Kang,GUO He,CHEN Chang-Yun.The variation of the deformation-strain field before Ms7.1 Yushu earthquake[J].Chinese Journal of Geophysics,2011,54(8):1990-1996. |
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| Authors: | GUO Liang-Qian BO Wan-Ju YANG Guo-Hua HU Xin-Kang GUO He CHEN Chang-Yun |
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| Institution: | First Crust Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China |
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| Abstract: | Base on the velocity field calculated from the GPS data from 1999 to 2007 and from 2007 to 2009,the movement characteristics of Qinghai-Tibet subplates were studied. The strain rate of Hoh Xil-Bayan Har block and the Qiangtang block, the velocity and the strain rate of Hoh Xil-Yushu fault zone were calculated by the block (rotation and linear stain) elastic movement formula. The deformation strain before MS7.1 Yushu earthquake has been studied. The result shows that between 1999 and 2007 the activity in Yushu fault zone was mostly left-lateral strike slip. Between 2007 and 2009, the strain rate of Hoh Xil-Yushu fault zone in the western part of Yushu has increased remarkably, which is favorable to stress accumulation. The Hoh Xil-Yushu fault zone in the eastern part of Yushu showed mainly right-lateral strike slip activity. Yushu was a transitional area between different kinds of active strain and became an unstable zone. The activity in Hoh Xil-Yushu fault zone became a condition of the MS7.1 earthquake, in the meantime,accumulated energy for the earthquake. |
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| Keywords: | Movement field of GPS Movement of block Activity of fault zone Increase of strain rates Development and occurrence of Yushu earthquake |
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