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Journal: |
Earthquake Research In China 2009 No.3
clicks:892 |
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Title:
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Author:
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Jiang Zaisen Wu Yanqiang Fang Ying Li Peng and Wang Wuxing |
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Adress: |
Institute of Earthquake Science , CEA , Beijing 100036 , China |
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Abstract:
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In this paper , we analyze the crustal movements , strain f ield changes and large scale dynamic characteristics of horizontal deformation before the Wenchuan earthquake ( MS = 810) using GPS data obtained from the Crustal Movement Observation Network of China. The following issues are discussed. First , the strain f ields 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 north2eastern direction , which is part of the background of the local tectonic dynamics increase in the Longmenshan fault zone. |
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