The Variation of the Deformation. Strain Field before Ms7.1 Yushu Earthquake
详细信息
- 责任者：Guo Liangqian (First Crust Monitoring and Application Center ; China Earthquake Administration ; Tianj in 300180 ; China) ; Bo Wanju
- 刊名：Chinese Journal of Geophysics
- 出版年：2011
- 卷期：54(8)
- 关键词：玉树地震2010 ; Yushu earthquake 2010 ; 应变分析 ; strain analysis ; 青海 ; Qinghai Province
- 页码：p.1990-1996
- 图表：6 illus., 11 refs.
- 分类号：0500
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
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 Hob Xil-Bayan Har block and the Qiangtang block, the velocity and the strain rate of Hob 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 Hob Xil-Yushu fault zone became a condition of the Ms7.1 earthquake, in the meantime,accumulated energy for the earthquake.