jgg     2009 29 (3):  50-54    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON METHOD OF DETECTING IONOSPHERIC TEC ANOMALY BEFORE EARTHQUAKE Zhu Fuying 1,2) ;Wu Yun 1,2) ;Lin Jian 1,2,3) ;Zhou Yiyan 1,2) ;Xiong Jing 1,2) ; and Yang Jian 1,2) 1)Institute of Seismology, CEA, Wuhan 430071 2)Crustal Movement Laboratory, Wuhan 4300713)GNSS Research Center, Wuhan University, Wuhan 430079 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null