近距离铁磁性物质干扰(农田耕作、基建等)、直流供电干扰(高压直流输电、地电阻率观测等)是地磁场地面观测的主要干扰方式。在滦县地震台布设地磁场井下观测系统,检验井下观测的抗干扰效果,结果发现,地磁场井下观测可抑制近距离铁磁性物质干扰,但无法抑制直流供电干扰(可通过避让一定距离解决),该分析结果为未来地震监测手段的选取提供技术参考指标和依据。
The interference of near field ferromagnetic material (farmland cultivation, infrastructure, etc.), DC power supply interference (high voltage direct current transmission, earth resistivity observation and so on) are the main ways of ground magnetic observation. In this paper, the installation of borehole geomagnetic observation system at Luanxian Seismic Station is introduced. An anti-interference test of borehole observation has been carried out. It is verified that the borehole observation of geomagnetic field can inhibit the short-range ferromagnetic substance interference, but can not inhibit the interference of DC power supply (by a certain distance, avoid solving). This analysis results provide the technical reference specifications and basis for future selection of earthquake monitoring means.
2017,38(4): 98-104 收稿日期:2017-03-28
DOI:10.3969/j.issn.1003-3246.2017.04.016
基金项目:中国地震台网中心协作项目(河北省地震前兆台网事件(2008-2014)分析提取与图集报告产出);华北片区地震前兆维修中心建设项目;中国地震背景场探测项目河北分项
作者简介:王莉森(1982-),男,本科,河北张家口人,工程师,主要从事地震监测工作。E-mail:wls@eq-he.ac.cn
参考文献:
胡星星,滕云田,张炼,等. 井下磁力计的研制[J]. 地球物理学进展,2011,26(5):1 849-1 858.
蒋延林,张秀霞,杨冬梅,等. 高压直流输电对地磁观测影响的特征分析[J]. 地震,2014,34(3):132-139.
林钢,杨会平,白彦峥,等. 高精度空间磁通门磁力计[J]. 华中科技大学学报(自然科学版),2005,33(12):61-63.
徐纪人,赵志新. 深井地球物理观测的最新进展与中国大陆科学钻探长期观测[J]. 地球物理学进展,2009,24(4):1 176-1 182.