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本文分析了华东地区震群活动的基本特征,得出近十几年来发生的两次中强地震(6.0.6.2)与该区北西西和北东东两个条带内震群活动有联系,总结出两次地震前的三个前兆异常阶段:1.地震应变能释放率缓慢性的加速或者震群活动频繁:2.长时期的平静.在平静期的始点有一个中等地震(中期信号震)发生:3.平静期的末尾部发生1-2次震群事件,此类震群是人震前的短期“信号震群.”中强地震前的震群活动的研究,已有不少的论著.近十几年来,华东地区及黄海海域发生了两次中强地震,那么该区发生的一系列震群事件是否与其有联系,我们对此进行了分析、研究,希望能找到这两次中强地震的前兆信息.
This paper analyzes the basic features of swarm activities in eastern China and concludes that two moderate-to-strong earthquakes (6.0.6.2) occurred in the last ten years are related to the swarm activities in the two northern and western eastern and northeastern eastern regions, The three precursory anomalies before the two earthquakes are summarized as follows: 1. The acceleration of seismic strain energy release rate is slow or the swarm is frequent: 2. Long-term calm. There is a moderate earthquake at the beginning of the quiescence ) Occurred: 3. 1-2 earthquake swarm events occurred at the end of the quiet period, and such swarm was the short-term earthquake swarm before the earthquake. In the last decade or so, two moderate-strong earthquakes occurred in the East China Sea and the Yellow Sea, and whether a series of earthquake-swarm events occurred in the area have been linked to it. We analyzed and studied this and hope to find out The precursors of these two moderate earthquakes.