点源干扰源定位方法及其在地电场观测中的实际应用  

Location method of point interference source and its practical application in geoelectric field observation

作　　者：张宇 王兰炜 胡哲 张兴国 娄晓宇 Zhang Yu;Wang Lanwei;Hu Zhe;Zhang Xingguo;Lou Xiaoyu(Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;National Institute of Natural Hazards,Ministry of Emergency Management of China,Beijing 100085,China)

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]应急管理部国家自然灾害防治研究院,北京100085

出　　处：《地震学报》2024年第1期106-119,共14页Acta Seismologica Sinica

基　　金：中央级公益性科研院所基本科研业务费专项(CEAIEF20220202)资助。

摘　　要：我国地震地电场观测时的漏电干扰问题会影响到观测质量和地震监测效能。针对这一实际问题,本文提出了点源干扰源定位方法。该方法首先建立地表点源对地电场观测影响模型,根据模型计算点源对地电场观测的干扰幅度,然后求解干扰源相对于中心电极的位置。将定位方法应用于高邮地震台和汉王地震台实际干扰源排查工作中,定位结果与实际干扰源位置基本一致,测区外干扰源定位误差小于2%,测区内干扰源定位误差小于20 m,并对影响计算误差的因素进行了分析。两个台站的实际应用表明:本文提出的定位方法为地电观测实践中查找点源漏电干扰源提供解决方案,能够有效地定位点源干扰源位置,提高干扰排查效率。China's seismic network currently comprises 113 geoelectric field monitoring stations.To effectively utilize geoelectric field monitoring data for earthquake prediction,it is crucial to accurately differentiate between seismic and non-seismic anomalies.However,with the rapid development of China's economy,agricultural production,and industrial construction around these monitoring stations,interference from electrical equipment leakage has escalated.This interference represents a significant non-seismic anomaly that adversely affects the quality of observation data and its application efficiency.1) The impact of electrical equipment leakage on geoelectric field observation can be characterized as follows:2) The observation curve exhibits significant steps,peaks,or dips.3) The daily variation pattern of the geoelectric field is suppressed.4) The amplitude of each component of the geoelectric field varies due to the relative positions of the leakage points.5) The interference in each channel begins and ends at the same time,synchronized with the leakage period,although the degree of influence may differ.6) The interference amplitude is inversely proportional to the distance between the interference source and the electrode and directly proportional to the magnitude of the leakage current.Leakage interference within the measurement area constitutes a non-seismic anomaly that significantly impacts the quality of the observation data.Therefore,it is essential to identify and promptly investigate sources of interference in daily earthquake monitoring to minimize data loss caused by such interference.Currently,two types of interference sources can be identified based on examples encountered by stations:point source interference and dipole source interference.However,there is currently no high-precision positioning algorithm available for point sources.This study established a point source interference model based on a uniform semi-infinite space,analyzed the theoretical influence amplitude of point sources on geoelectric

关 键 词：地电场观测 漏电 点源干扰源 定位方法 

分 类 号：P319.3[天文地球—固体地球物理学]