| The Dynamic Characteristics of Strain Fields and Crustal Movement before the Wenchuan Earthquake （ Ms = 8.0） |
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| 作者姓名： | Jiang Zaisen Wu Yanqiang Fang Ying Li Peng Wang Wuxing |
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| 作者单位： | Institute of Earthquake Science,CEA,Beijing 100036,China |
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| 摘 要： | In this paper, we analyze the crustal movements, strain field changes and large scale dynamic characteristics of horizontal deformation before the Wenchuan earthquake (M_S=8.0) using GPS data obtained from the Crustal Movement Observation Network of China. The following issues are discussed. First, the strain fields of the Longmenshan fault zone located at the epicenter show slow accumulation, because of the tectonic dynamics process subjected to the eastward movement of the Bayan Har block. Second, the different movements between the Longmenshan fault and South China block are smaller than the errors of GPS observation. Third, the high value of compressive strain (2004～2007) is located at the epicenter, which shows that the local squeezing action is stronger than before. Fourth, the data from GPS reference stations in the Chinese Mainland show that crustal shortening is faster than before in the north-eastern direction, which is part of the background of the local tectonic dynamics increase in the Longmenshan fault zone.
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| 关 键 词： | 地壳运动观测网络 动态特性 应变场 地震前 汶川 龙门山断裂带 构造动力学 全球定位系统 |
The Dynamic Characteristics of Strain Fields and Crustal Movement before the Wenchuan Earthquake (M_S=8.0) |
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| Jiang Zaisen,Wu Yanqiang,Fang Ying,Li Peng,Wang Wuxing.The Dynamic Characteristics of Strain Fields and Crustal Movement before the Wenchuan Earthquake (M_S=8.0)[J].Earthquake Research in China,2009,23(3):257-265. |
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| Authors: | Jiang Zaisen Wu Yanqiang Fang Ying Li Peng and Wang Wuxing |
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| Institution: | Institute of Earthquake Science, CEA, Beijing 100036, China |
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| Abstract: | |
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| Keywords: | Wenchuan earthquake (Ms = 8 0) GPS Crustal movement Strain field Tectonic dynamics background |
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