Active tectonics, e.g., faulting, folding, and rifting are clearly manifested over the vast territory of China. The in-tensive crustal deformation with long-lived structures has given rise to numerous highly-elevated mountains in the western China with the Yangtze and Yellow rivers downstreaming to the east,as well as resulting in catastrophicearthquakes with huge fatalities in the historical times. Quantifying crustal deformation into its amount, distribu- tion, and timing is prerequisite for an understanding of the nature of geological evolution, climate-tectonics interaction, and ultimately the geodynamic aspects that control these processes. Moreover, monitoring active deformation with great precision is of fundamental importance in trying to forecast earthquake or assess seismic hazard for an earth- quake-prone country like China.
LI QiangYOU XinZhaoYANG ShaoMinDU RuiLinQIAO XueJunZOU RongWANG Qi
Based on Continuous GPS （CGPS） observation data of the Crustal Movement Observation Network of China （CMONOC） and the Sichuan Continuous Operational Reference System （ SCCORS）, we calculated the horizontal coseismic displacements of CGPS sites caused by the 2013 Lushan Mw 6.6 earthquake. The resuits indicate that the horizontal coseismic deformations of CGPS stations are consistent with thrust-compression rupture. Furthermore, the sites closest to the epicenter underwent significant coseismic displacements. Three network stations exhibited displacements greater than 9 mm （ the largest is 20.9 mm at SCTQ） , while the others were displaced approximately 1 -4 mm.
In this study, we analyze the regional GPS data of Crustal Movement Observation Network of China （CMONOC） observed from 2009-2013 using the BERNESE GPS software, and then the preliminary results of horizontal velocity field and strain rate field are presented, which could reflect the overall deformation features in the Chinese mainland from 2009-2013. Besides, the velocity error and the probable factors that could influence the estimate of long-term deformation are also discussed.
Wang WeiWang DijinZhao BinHuang YongZhang CaihongTan KaiYang Shaomin
