• 责任者：Jiang Zaisen （Institute of Earthquake Prediction ; CEA ; Beijing 100036 ; China） ; Wu Yanqiang
• 刊名：Earthquake
• 出版年：2009
• 卷期：29(1)
• 关键词：地壳运动 ; crustal movement ; 汶川地震2008 ; Wenchuan earthquake 2008 ; 龙门山断裂带 ; Longmenshan Fault Zone
• 页码：p.68-76
• 图表：5 illus., 15 refs.
• 分类号：0500
• issnNo：ISSN1000-3274
• isbnNo：CN11-1893/P

///In this paper, the authors analyzed the crustal movements, strain field variations and large scale dynamic characteristics of horizontal movements before Wenchuan M_S8.0 earthquake, using GPS data obtained from the Crustal Movement Observation Network of China. In this process, some issues are discussed. First, the strain fields of Longmenshan fault zone which hosted the earthquake show slowly accumulating state, and the reason is the acting tectonic dynamics owing to the east movement of the Bayan Har block. Second, the differential movement between the Longmenshan fault and the South China block is within the errors of GPS observations. Third, the high value of compressive strain between 2004~2007 appeared at the epicenter area, which shows a stronger local squeezing action. Fourth, the data of GPS reference stations shows faster crustal shortening in the north-east direction, which is one of background of the increasing local tectonic dynamics in the Longmenshan fault zone.