乌鲁木齐地电场变化特征分析  

Analysis on variation characteristics of geoelectric field in Urumqi

作　　者：毛玉剑 王斌 蒋胜杰 贾路 古丽扎·艾尔肯 曹莹 MAO Yujian;WANG Bin;JIANG Shengjie;JIA Lu;Gulizha AIERKEN;CAO Ying(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,China)

机构地区：[1]新疆维吾尔自治区地震局,乌鲁木齐830011

出　　处：《地震地磁观测与研究》2024年第6期61-71,共11页Seismological and Geomagnetic Observation and Research

基　　金：新疆维吾尔自治区地震局青年科学基金(项目编号:202314);克拉玛依市创新环境计划(创新人才)项目(项目编号:2024hjcxrc0099)。

摘　　要：基于乌鲁木齐地电场观测资料,运用谐波拟合等数据处理方法,从日变化形态、优势方位角、优势周期、极化特征等方面分析地电场变化特征,可知:①乌鲁木齐地电场各测道日变化基本呈“两峰一谷”形态,能清晰记录地电暴数据,地电暴日形态为突跳、阶跃、震荡等,在发生地电暴时EW测道变幅较NS测道大。②各测道优势方位角较稳定,αNS/NE-L、αEW/NE-L、αNS/NE-S、αEW/NE-S基本保持在59.24°、47.32°、64.94°、50.65°(±45°)。③磁静日期间,地电场数据优势周期有12 h、6 h、8 h、24 h等;地电暴发生时,4.8 h、3 h、1.4 h、0.6 h等较短周期成分更加突显。④磁静日和地电暴期间,乌鲁木齐地电场均表现出非线性极化特征。Harmonic fitting are used to analyze the variation characteristics of geoelectric field from the aspects of diurnal variation form,dominant azimuth angle,dominate period and polarization characteristics.The results are:①The diurnal variation form of geoelectric field in Urumqi is basically in the form of“two peaks and one valley”,which can clearly record the data of geoelectric storm.The diurnal morphology of geoelectrical storm is sudden jump,step and shock,etc.The variation amplitude of the EW track is larger than that of the NS track when the geoelectrical storm occurs.②The dominant azimuth of each channel is stable,andαNS/NE-L,αEW/NE-L,αNS/NE-S,αEW/NE-S basically remain at 59.24°,47.32°64.94°,50.65°(±45°).③During the magnetostatic days,the dominant period of geoelectric field is 12 h,6 h,8 h,24 h,etc.When the geoelectric storm occurs,the shorter period components such as 4.8 h,3 h,1.4 h,and 0.6 h are more prominent.④The geoelectric field in Urumqi shows nonlinear polarization characteristics no matter in static day or geoelectric storm.

关 键 词：大地电场 日变化 优势方位角 周期 

分 类 号：P31[天文地球—固体地球物理学]