在强震发生前后,在震中及其邻近地区往往发生重力异常现象,也就是说,重力加速度的数值出现起伏.这种重力异常同强震有内在的联系.因此,探索强震前后重力场的变化规律对于地震预报有很大意义. 我们对于河北省邢台、河间和辽宁省海城三地强震前后的重力变化作了调查,收集了历史资 Before and after a strong earthquake, the phenomenon of gravity anomaly often occurs in the epicenter and its adjacent areas, that is, the value of gravity acceleration fluctuates, which is intrinsically linked with strong earthquakes. Therefore, The law of variation is of great significance for earthquake prediction.We investigated the gravity changes before and after the strong earthquakes in Xingtai, Hejian, and Haicheng, Liaoning Province, and collected historical data