jgg     2014 34 (6):  109-113    ISSN: 0412-1961  CN: 21-1139/TG COMPARISON OF GRAVITY FILED MODELS BASED ON GOCE DATAS 1）Earthquake Administration of Shaanxi Province，Xi’an 710068 2）School of Geology Engineering and Geomatics，Chang’an University，Xi’an 710054 Received: 2013-10-12  Revised: null  Online: 2014-12-09 Supporting info