Study on Gravity Changes in Eastern North China Based on Time Variable Gravity Data of GRACE Satellite

Using the GRACE time-variable gravity data and set annual average values of 2003 and 2004 as the base value, we obtained cumulatively dynamic changes in the gravity field and differential dynamic changes image from 2005 to 2014 by calculating with respect to the above-mentioned base value, and on this basis we analyzed the spatial and temporal dynamic variations of gravity field in this region nearly a decade. The results show that the accumulated gravity field in the study area is dominated by decrease in this decade; after 2010, differential gravity changes are in the SN-trending banded distribution, gravity field changes increase and differential gravity field inverses in the adjacent phase.