运城M_(S)4.4地震前地磁谐波振幅比异常特征分析  

Analysis of Abnormal Characteristics of Geomagnetic Harmonic Amplitude Ratio Before the Yuncheng M_(S)4.4 Earthquake

作　　者：刘素珍[1,2] 范磊[1,2] 宁亚灵[1,2] 王鹏伟[1,2] LIU Suzhen;FAN Lei;NING Yaling;WANG Pengwei(Shanxi Earthquake Agency,Taiyuan,Shanxi 030021,China;National Continental Rift Valley Dynamics Observatory of Taiyuan,Taiyuan,Shanxi 030025,China)

机构地区：[1]山西省地震局,山西太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西太原030025

出　　处：《山西地震》2025年第1期13-17,共5页Earthquake Research in Shanxi

基　　金：2024年度震情跟踪定向工作任务(2024020402)。

摘　　要：基于山西临汾、河南洛阳和陕西周至地磁台的数字化资料,采用地磁谐波振幅比方法对2016年3月12日山西运城M_(S)4.4地震前后的地磁异常信号进行分析研究。结果显示,在震前一年两个月左右的时间中,临汾台的地磁谐波振幅比Y_(ZHx)与Y_(ZHy)两方向在长短周期内均出现反向异常变化,异常变化过程不同步;洛阳和周至台地磁谐波振幅比Y_(ZHx)与Y_(ZHy)两方向在长短周期内两方向同步性较好,未出现明显的不一致现象。3个地磁台表现出异常空间分布不均匀,可能与不在同一地质构造单元有关。This study uses digital data from geomagnetic stations in Linfen(Shanxi),Luoyang(Henan),and Zhouzhi(Shaanxi)and applies the geomagnetic harmonic amplitude ratio method to analyze geomagnetic anomaly signals before and after the M_(S)4.4 earthquake in Yuncheng,Shanxi,on March 12,2016.The results indicate that approximately one year and two months before the earthquake,the Y_(ZHx)and Y_(ZHy)harmonic amplitude ratios at the Linfen station showed opposite anomalous changes in both long and short periods,with asynchronous variation processes.In contrast,at the Luoyang and Zhouzhi stations,the Y_(ZHx)and Y_(ZHy)harmonic amplitude ratios exhibited good synchronization across both long and short periods,with no significant inconsistencies observed.Three geomagnetic observatories exhibit uneven spatial distribution,which may be related to their location in different geological tectonic units.

关 键 词：地磁异常 地磁谐波振幅比 运城M_(S)4.4地震 

分 类 号：P318.5[天文地球—固体地球物理学]