兴济地震台大地电场方位变化特征  

Azimuth Variation Characteristics of Geoelectric Field at Xingji Seismic Station

作　　者：李瑞卿 郭学增 李凤 张蕾 信世民 尹宏伟 LI Ruiqing;GUO Xuezeng;LI Feng;ZHANG Lei;XIN Shimin;YIN Hongwei(Shijiazhuang Seismic center station,Shijiazhuang 050021,China)

机构地区：[1]石家庄地震监测中心站,石家庄050021

出　　处：《华北地震科学》2023年第3期91-96,共6页North China Earthquake Sciences

基　　金：中国地震局监测、预报、科研三结合课题(3JH-202201056)。

摘　　要：根据地电场成分分类取空间电磁环境较为平静且地电场观测数据日变形态较为稳定的时段对兴济台大地电场ET进行提取,然后利用正交向两测道大地电场合成总的大地电场E_(T总)。对总大地电场方位变化进行对比发现,兴济台午前午后大地电场方位角图像较平凉、大柏舍数据离散度高,无午前午后3个阶段的稳定形态变化特征;通过谐波分析及F检验发现,兴济台大地电场前10阶谐波拟合程度相对较低、高阶谐波成分显著,说明兴济台地电场成分复杂,可能是造成一天中大地电场方位角数据离散的原因。Based on the classification of the geoelectric field,the ET of geoelectric field of Xingji seismic station is extracted at the time when the space electromagnetic environment is calm and the daily deformation of the geoelectric field is stable.Then,the total E_(T) of the geoelectric field is synthesized by using the orthogonal two-channel geoelectrical field.The azimuth variation of the total geoelectrical field is analyzed:the azimuth angle is calculated and the scatter plot is drawn.The azimuth of the geoelectric field in Xingji Seismic Station is more discrete than that in Pingliang and Dabaisha.Tha data does not have the characteristics of three-stage steady-state variation.Harmonic fitting was used to analyze the harmonics of the electric field data of Xingji,Pingliang,Dabaishe and Changli stations.The differences of harmonic components of these stations were analyzed by harmonic fitting degree and f-test,furthermore,the reason of the instability of the azimuth data before and after noon in geoelectric field of Xingji sataion is analyzed.The low fitting degree of the first 10 order harmonics and the obvious high order harmonics in Xingji Seismic Station geoelectric field indicate that the complex composition of the field in Xingji Seismic Station may be the cause of the dispersion of the azimuth data of the geoelectric field in a day.Finally,it provides a reference for understanding the composition and extraction of the geoelectric field.

关 键 词：大地电场方位角 谐波分析 拟合程度 F检验 

分 类 号：P315.722[天文地球—地震学]