山西地震带不同基准的重力场变化

对2011—2017年山西及周边的流动重力观测资料,在绝对点控制下重新做平差计算,从不同尺度分析重力场的动态变化和跨断裂重力段差变化,重点对不同基准的重力场累积变化特征进行比较,结果显示:①文中的平均值基准可以明显削弱单期数据或个别测点对重力场造成的非正常影响;②在山西地震带持续出现了区域性的重力异常,形成了与构造断裂较为一致的重力梯度带;③山西地震带北部测段重力段差的变化幅值最大,南部次之但强于中部,反映了北部的构造活动比较活跃。

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.