2013年辽宁灯塔M5.1地震地磁异常变化特征  

Variation of the Geomagnetic Anomaly Characteristics before the Liaoning Dengta M5.1 Earthquake in 2013

作　　者：贾立峰[1] 乔子云[1] 张国苓[1] 寇海川 梁红杰[1] JIA Lifeng QIAO Ziyun ZHANG Gouling KOU Haichuan LIANG Hongjie(Hebei Earthquake Agency, Shijiazhuang 050021, Hebei, Chian)

机构地区：[1]河北省地震局,河北石家庄050021

出　　处：《地震研究》2017年第3期437-443,共7页Journal of Seismological Research

基　　金：国家自然科学基金项目(41274079);中国地震行业专项(201508013);中国地震局震情跟踪定向工作任务(2017010409)联合资助

摘　　要：采用地磁谐波振幅比方法和地磁总强度F21相关法对2013年1月23日辽宁灯塔M5.1地震震中周边的铁岭台、营口台、通化台及朝阳台2008年1月至2015年12月的地磁数据进行了计算分析。并利用震中周边16个台站的地磁Z分量数据进行了大区域地磁低点位移异常扫描,分析震前可能出现的短期地震地磁异常。通过不同方法总结了在显著地震发震前出现的中期至短期的不同地磁异常特征,结果显示:4个地磁台站地磁谐波振幅比结果部分周期在发震前2~4 a开始出现下降变化,在转为上升过程中或者上升至高值后发震;地磁总强度F21相关法在地震前有明显的下降异常变化特征;区域地磁低点位移法在震前13天显示了极为明显的分界现象。Using the geomagnetic data recorded between January 2008 and December 2015 that observed by four geo- magnetic stations such as Tieling, Yingkou, Tonghua and Chaoyang, we study the Dengta M5. 1 earthquake through the methods including geomagnetic harmonic wave amplitude ratio （HWAR） and spatial correlation of geomagnetic F21 （ SC - F21 ） . And by scanning the large area of geomagnetic low - point displacement anoma- lies （LPD） based on geomagnetic Z component data provided by 16 stations around the epicenter, we analyze short - term earthquake geomagnetic anomalies that may occur before the earthquake. Then we summarizes the different magnetic medium to short -term anomaly characteristics that appeared before the earthquake. The study showed that the HWAR appeared some decline anomaly about 2 -4 years before the Dengta earthquake and the earthquake occurred in the rising stage. Some obvious decline anomaly appeared before the earthquake in the SC -F21 result, and a clear dividing line appeared in LPD method about 13 days before the earthquake occurred.

关 键 词：灯塔M5.1地震 地磁异常 地磁谐波振幅比 地磁总强度F21相关法 区域地磁低点位移法 

分 类 号：P318[天文地球—固体地球物理学]