盖州震群的重新定位

Accurate relocation of earthquake swarm in Gaizhou，Liaoning，China

摘要:

辽宁省盖州地区自2012 年2 月2 日开始发生了多次4 级地震的震群活动。震群位于北东向的金州断裂北端和北东向海城-营口断裂南端，震群序列整体上呈北西向，即盖州震群并不是发生在北东向的金州断裂北端，很可能发生在金州断裂和海城-营口断裂之间的北西西向构造上。为考察此问题，利用2012 年以来辽宁台网盖州地区的地震观测报告，采用双差定位的方法，给出这个地区的小震精定位结果，结果显示盖州震群的确沿北西向分布，且有随时间向北西向展布的态势。且震源深度逐渐变浅。分析认为盖州震群是发生在金州断裂和海城-营口断裂之间的北西向断层上。

Abstract:

There was a ML4． 0 earthquake swarm since February 2，2012 in the Gaizhou area． The Gaizhou ML4． 0 earthquake swarm was located on the northern Jinzhou fault and the southern part of Haicheng-Yingkou fault． The overall earthquake distribution was in the northwest direction． We used the earthquake observation reports recorded by the Liaoning seismic stations during the period February 2012 ～ September 2013，and with the double difference location method，obtained the earthquake location of Gaizhou earthquake swarm． The result of earthquake location showed the earthquake swarm distributed along the NW-trending，indeed． As the earthquake swarm developed，the depth of earthquakes became shallower． Analysis showed the Gaizhou earthquake swarm occurred in a new NW-trending faults between on the Jinzhou fault and Haicheng-Yingkou fault．