STUDY ON FEATURES SPACE-TIME VARIATION OF GRAVITY FIELD IN XI’AN REGION
Hu Bin, Zhu Yiqing, Xu Yunma and Cao Qiming (Second Crust Monitoring and Application Center, CEA, Xi’an 710054)
Space-time variation of gravity in Xi’an since 1992 is summarized. The gravity variation in southern suburb of Xi’an is considerably, and the gravity in northern suburb of Xi’an is relatively stable. Where there gravity varies obviously, there ground subsides seriously. The main cause of the gravity variation is that groundwater has been over mined, thus, hydrous system is so pressed that ground gravity varies.