【摘要】 河南封丘4级震群尤其是ML4.8地震前后重力场的变化和动态演化特征的研究表明:震前冀鲁豫测区的重力场出现上升→下降→上升变化可能是较明显的中短期前兆异常反映;封丘地震发生在重力加速变化过程中。重力场动态图像较清晰地反映了孕震区准均匀态→非均匀态→发震的演化过程。震后该区的重力异常没有恢复。还介绍了根据重力异常对封丘地震预测的过程。更多还原

【Abstract】 The variation features of gravity field and seismicity before and after the Fengqiu earthquake swarm are discussed based on the data of gravity monitoring network in border region of Hebei-Henan-Shandong provinces.The results show that the ascent→descent→ascent variations of the gravity field before the earthquake are the obvious reflection of medium-short-term anomalies in the gravity field,and the earthquake occurred during changing stage of acceleration.The dynamic images reflect clearly the evolutionary process of the gravity field in the seismogenic zone,i.e.quasi-homogeneous state→inhomogeneous state→earthquake occurrence.After the earthquakes,the gravity anomalies in this region did not recover.The prediction of Fengqiu earthquake according to the gravity anomalies is presented in the paper also.更多还原