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盖州震群的重新定位
王亮1,2) 黄金水1) 焦明若2) 曹凤娟2) 李彤霞2) 梁一婧2)
1)中国科学与技术大学,合肥市金寨路96 号230026;2)辽宁省地震局,沈阳市皇姑区黄河北大街44 号110034
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。
关键词:  双差定位  盖州震群  北西向断层
DOI:
分类号:
基金项目:地震科技星火项目“辽宁至辽吉蒙交界地区速度结构与震源位置联合反演研究”(XH15013Y)资助
Accurate relocation of earthquake swarm in Gaizhou,Liaoning,China
Wang Liang1,2) Huang Jinshui1) Jiao Mingruo2) Cao Fengjuan2) Li Tongxia2) Liang Yijing2)
1) School of Earth and Space Science,University of Science and Technology of China,Hefei 230026,China;2) Earthquake Administration of Liaoning Province,Shenyang 110034,China
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.
Key words:  The double difference location  The Gaizhou earthquake swarm  Northwest fault