Zhang Qiang 1,2,3) ;Wu Yun 1,2,3) ;Lin Jian 1,2,3) ;Zhou Yiyan 1,2,3) ;Yang Shaomin 1,2,3) ; and Li Deqian 4)
1)Institute of Seismology, CEA, Wuhan 4300712)Wuhan Base of Institute Crustal Dynamics,CEA,Wuhan 4300713)Crustal Movement Laboratory, Wuhan 430071 4)Wuhan Fiducial Earthquake Station,Earthquake Administration of Hubei Province,Wuhan 430071
Abstract：On the basis of the GPS phase observation from the reference stations of crustal movement observation network,the continuous 50day VTEC values before two Ms>6 earthquakes are analyzed, and the earthquake examples are tested with 1.5muliple standard diviation of 15day VTEC values as limited range.The results show that there were the ionospheric anomalies before the two related earthquakes.
