jgg     2009 29 (4):  5-9    ISSN: 0412-1961  CN: 21-1139/TG DISCUSSION ABOUT INFLUENCE OF ITRF “FRAME DRIFT” ON GPS CONTINUOUS OBSERVATION Yang Guohua 1) ;Wang Cuizhi 2) ;Yang Bo 1) ;Zhang Fengshuang 1) ;Liu Xia 1) ; and Han Yueping 1) 1) First Crust Monitoring and Application Center,CEA,Tianjin 3001802) Earthquake Administration of Tianjin Municiplity，Tianjin 300201 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null