The April 20,2013,Ms7.0 Lushan earthquake was successfully recorded by closely spaced Continuous Global Positioning System (CGPS) stations owned by the Crustal Movement Observation Network of China (CMONC).The 1-Hz GNSS data from eight CGPS stations,which are located between 30 km and 200 km from the hypocenter,were processed within quasi-real-time.The near-field surface deformation indicated the following characteristics:the near-field movements were limited to several centimeters;the peak of the deformation wave was significantly larger than the static permanent offset;at the beginning of the event,the north wall of the fault moved to the southeast as the south wall moved to the southwest;station SCTQ,which was the closest station to the hypocenter at 30 km,had the largest static permanent displacement of 2 cm;the peaks of the deformation waves were 1.5 cm,5 cm and 3 cm,to the east,the south and vertically upward,respectively;and the peaks of velocity and acceleration,derived from the deformation,were 3.4 cm/s and 5.3 cm/s2,respectively.
Liu GangZhao BinZhang RuiHuang YongWang JunNie ZhaoshengQiao XuejunTan Kai
The April 25,2015 Mw7.8 Nepal earthquake was successfully recorded by Crustal Movement Observation Network of China(CMONOC) and Nepal Geodetic Array(NGA).We processed the high-rate GPS data(1 Hz and 5 Hz) by using relative kinematic positioning and derived dynamic ground motions caused by this large earthquake.The dynamic displacements time series clearly indicated the displacement amplitude of each station was related to the rupture directivity.The stations which located in the direction of rupture propagation had larger displacement amplitudes than others.Also dynamic ground displacement exceeding 5 cm was detected by the GPS station that was 2000 km away from the epicenter.Permanent coseismic displacements were resolved from the near-field high-rate GPS stations with wavelet decomposition-reconstruction method and P-wave arrivals were also detected with S transform method.The results of this study can be used for earthquake rupture process and Earthquake Early Warning studies.
Yong HuangShaomin YangXuejun QiaoMu LinBin ZhaoKai Tan
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
