大连地磁台极低频观测天然源电磁场数据分析  

ANALYSIS ON NATURAL SOURCE ELECTROMAGNETIC FIELD DATA FOR EXTREMELY LOW FREQUENCY OBSERVATION OF DALIAN GEOMAGNETIC STATION

作　　者：孙国涛 曲骞 于治信 SUN Guotao;QU Qian;YU Zhixin(Seismic Station of Dalian,Dalian 116000,China)

机构地区：[1]大连地震台,辽宁大连116000

出　　处：《高原地震》2023年第1期34-42,共9页Plateau Earthquake Research

摘　　要：利用大连极低频电磁观测台的连续观测数据,采用天然源电磁法对观测的电磁场数据进行了处理和分析。结果表明天然源电磁场具有明显的周期性变化特征,表现为白天电磁场谱值比夜间的大,日变化和夏季谱值是冬季谱值的2倍左右的季节性的特征。对地磁台站观测天然源电磁场数据的非地震影响因素主要为雷电、磁暴以及电磁环境(如高压直流输电)等。Based on the continuous observation data of Dalian extremely low frequency electromagnetic Observ⁃atory,the electromagnetic field data are processed and analyzed by natural source electromagnetic method.The results show that the electromagnetic field of natural source has obvious periodic variation characteristics,which shows that the electromagnetic field spectrum value in daytime is larger than that in night,and the diur⁃nal variation value in summer is about twice of that in winter.The non⁃seismic factors affecting the natural source electromagnetic data onto geomagnetic stations are mainly lightning,magnetic storm and electromagnetic environment(such as HVDC transmission).

关 键 词：极低频电磁观测 天然源电磁场 时间变化特征 影响因素 

分 类 号：P315.725[天文地球—地震学]