2013年辽宁灯塔M5.1地震前小震序列震源机制一致性特征  

Focal Mechanism Consistency Features of Small Earthquake Sequence before Dengta M5.1 Earthquake in Liaoning Province in 2013

作　　者：戴盈磊[1] 张欣然[1] 惠杨 李子昊 王承伟[1] DAI Ying-lei;ZHANG Xin-ran;HUI Yang;LI Zi-hao;WANG Cheng-wei(Liaoning Earthquake Agency,Liaoning Shenyang 110034,China)

机构地区：[1]辽宁省地震局,辽宁沈阳110034

出　　处：《防灾减灾学报》2023年第1期6-11,共6页Journal of Disaster Prevention And Reduction

基　　金：辽宁省地震局预研孵化基金项目(LZ2022001);沈抚新区浑河断裂带活断层探测与地震危险性评价项目(LNZC2018-0173)。

摘　　要：从辽宁测震台网2012年1月1日至2022年7月10日的观测报告中筛选出36049条Pg震相走时数据,反演了辽宁地区最小一维P波速度模型。采用P波初动方法求解了2012年1月1日至2013年1月23日灯塔M 5.1地震发生前,震中附近M_(L)2.5~4.1地震震源机制解,并根据三角形图解分类方法进行了分类。计算了这些小震与灯塔M 5.1地震震源机制解的最小空间旋转角,通过分析其变化趋势,发现灯塔M 5.1地震前小震序列存在明显的震源机制一致性特征。Based on the 36,049 Pg seismic phase travel-time data of Liaoning Seismic Network’s observa⁃tion report from January 1,2012 to July 10,2022,the minimum 1-Dvelocity model of P-wave in the Liaoning area were inverted.The focal mechanism solutions of the M_(L)2.5~M_(L)4.1 earthquakes near the epicenter from January 1,2012 to January 23,2013 before the Dengta M5.1 earthquake were solved by the P-wave initial motion method.And they were classified according to the triangular diagram classification method.The mini⁃mum spatial rotation angle of these small earthquake focal mechanism solutions and the DengtaM 5.1 earth⁃quake were calculated.By analyzing the variation trend,the result shows that the DengtaM 5.1 earthquake has obvious focal mechanism consistency characteristics.

关 键 词：灯塔M5.1地震 最小一维P波速度模型 P波初动 震源机制一致性 应力场 

分 类 号：P315.3[天文地球—地震学]