GNSS监测的川滇地区地壳形变动态变化特征

利用1999~2015年陆态网和四川省CORS网GNSS数据，研究川滇地区地壳形变动态变化特征，按照1999~2004年、2004~2007年、2007~2009年、2009~2011年、2011~2013年、2013~2015年建立6期地壳速度场和应变率场，并进行对比分析。研究表明，川滇地区地壳水平运动整体以继承性运动为主，汶川地震等强震没有改变区域整体运动趋势与作用力方向，但速度场随时间变化更加复杂且量级有所增加，特别是在龙门山断裂西侧，汶川地震后运动速率明显增加。川滇地区应变率数值和形变状态随时间呈现较为明显的动态变化特征，变化较大区域主要位于龙门山断裂、鲜水河断裂、小江断裂等深大断裂周边，表明川滇地区断裂活动对地壳形变影响显著。

GNSS Monitoring Dynamic Variation Characteristics of Crustal Deformation in the Sichuan-Yunnan Region

We study crustal dynamic deformation in the Sichuan-Yunnan region based on 1999-2015 GNSS data of CMONOC and Sichuan province CORS network. We divide into six periods of 1999-2004, 2004-2007, 2007-2009, 2009-2011,2011-2013 and 2013-2015, establish three crustal deformation models respectively, and conduct the contrast analysis. The research shows that the crustal horizontal movement is mainly inherited movement in Sichuan-Yunnan region. The crustal movement trend and the acting force are not changed by the Wenchuan earthquake, but the velocity field variations are more complex with time and increase in magnitude. Especially on the west side of the Longmenshan fault, crustal movement velocity increases obviously after the Wenchuan earthquake. The strain rate and state show obvious dynamic characteristics with time, and the high value areas are mainly located around the deep faults such as the Longmenshan, Xianshuihe and Xiaojiang faults. It shows that the fracture activity has a significant influence on crustal deformation control in the Sichuan-Yunnan region.