Dynamic Variation of Gravity Field in the Shanxi Seismic zone of Different Datum

Using the observation data of absolute and relative gravity measurements in Shanxi region from 2011 to 2017, We have analyzed the spatial-temporal variation of the regional gravity field at different time scales and variation of gravity segments across the fracture. Dynamic patterns of cumulated gravity change of Different Datum. Our research mainly shows that:(1)Better datum can obviously weaken the tendency of the gravity variation caused by Single measuring point, it's very important for the measured results.(2)Regional gravity anomaly appeared in the north and south of the study region, and there is a gravity change belt and continues to strengthening along the fault zone.(3)The change of gravity segments is biggest in the north along the shanxi seismic belt,followed by the south but stronger than in the middle. This reflects active tectonic activity in the north.