jgg     2013 33 (6):  16-19    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON APPLICATION OF MOBILE GRAVITY DATA IN  GROUND SUBSIDENCE AREA First Crust Monitoring and Application Center, CEA, Tianjin 300180 Received: 2013-07-11  Revised: null  Online: 2013-12-13 Supporting info