2018年吉林松原M_(S)5.7地震地磁异常分析  

Geomagnetic Anomalies Analysis of 2018 Songyuan M_(S)5.7 Earthquake in Jilin Province

作　　者：张志宏[1] 郭安宁[2] 李梦莹[1] 黄明威 杨牧萍 ZHANG Zhi-hong;GUO An-ning;LI Meng-ying;HUANG Ming-wei;YANG Mu-ping(Liaoning Earthquake Agency, Shenyang 110034, China;Lanzhou Institute of Seismology, Lanzhou 730000, China)

机构地区：[1]辽宁省地震局,沈阳110034 [2]中国地震局兰州地震研究所,兰州730000

出　　处：《科学技术与工程》2021年第29期12406-12414,共9页Science Technology and Engineering

基　　金：辽宁省科学技术计划(2019010223-JH8/103)。

摘　　要：为了分析2018年5月28日吉林松原M_(S)5.7地震前后的地磁异常特征,通过收集2016—2019年东北地区固定地磁台连续观测波形,运用地磁加卸载响应比法和地磁谐波振幅比法分析地震前后数据。结果表明:2018年5月28日前半年内出现了地磁Z分量加卸载响应比多台同一天或相邻两天同步跨越式短期异常2次;三岗、铁岭地磁谐波振幅比存在同方向不同周期不同步趋势异常,异常形态表现为趋势下降-上升-恢复,地震发生在异常恢复阶段;两种方法结合预测地震的发震时间和震中效果较好。可见,地磁多方法是地磁学预测地震新的方向。In order to analyze the geomagnetic anomaly characteristics before and after the Jilin Songyuan M_(S)5.7 earthquake on May 28,2018,the continuous observation waveforms of fixed geomagnetic stations in Northeast China from 2016 to 2019 were collected,the geomagnetic load-unload response ratio method and the geomagnetic harmonic amplitude ratio method were used to analyze the data before and after the earthquake.The results show that the geomagnetic Z component load-unload response occurred twice in the half year before May 28,2018 than multiple synchronous leapfrogging short-term anomalies on the same day or two adjacent days.Sangang and Tieling geomagnetic harmonic amplitude ratios had an abnormal trend of non-synchronization with different periods in the same direction.The abnormal shape was manifested as a trend downward-rising-recovery,and the earthquake occurred in the abnormal recovery stage.The combination of the two methods is effective in predicting the time and epicenter of an earthquake.It can be seen that the multi-methods of geomagnetism are the new direction of geomagnetism to predict earthquakes.

关 键 词：地磁场 松原M_(S)5.7地震 加卸载响应比 地磁谐波振幅比 

分 类 号：P315.7[天文地球—地震学]