江苏常州4.2级地震前的重力变化

利用江苏地区2019~2021年流动重力观测资料，分析江苏省常州市4.2级地震前不同时间尺度下的重力场变化。结果表明：1）0.5 a尺度重力场变化图像较好地反映了此次地震下降-转折上升-持续上升-反向变化及零值线附近发震的演化过程；2）常州4.2级地震前0.5 a和1 a尺度下的重力场均显示，地震发生在重力变化零值线附近。

Gravity Variation Before the M4.2 Earthquake in Changzhou,Jiangsu

Using mobile gravity observation data in Jiangsu from 2019 to 2021, we analyze the variation characteristics of the gravity field at different time scales before the Changzhou M4.2 earthquake in Jiangsu. The results show that: 1) The 0.5 a scale gravity field change image better reflects the change process of this earthquake’s decline-turn up-continuous rise-reverse change, and the evolution of seismogenesis near the zero contour; 2) The 0.5 a and 1 a scale gravity fields before the Changzhou M4.2 earthquake both show that the earthquake occurred near the zero-contour line of gravity change.