jgg     2012 32 (3):  1-6    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON MECHANISM OF GRAVITY FIELD CHANGE IN NORTHEASTERN MARGIN OF QINGHAI-TIBET PEATEAU Zhu Yiqing 1) ; Liang Weifeng 1) ; Chen Shi 2) ; and Zhao Yunfeng 1) 1)Second Crust Monitoring and Application Center, CEA, Xi’an 710054;2)Institute of Geophysics，CEA，Beijing 100081 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null