武汉地铁运行对应城地震台地磁观测的影响  

Influence to the geomagnetic observation at Yingcheng Seismic Station caused by Wuhan railway

作　　者：张建涛 王明贵[1] 陈星星[1] 周超 ZHANG Jiantao;WANG Minggui;CHEN Xingxing;ZHOU Chao(Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration,Wuhan 430071,China)

机构地区：[1]中国地震局地震研究所,中国地震局地震大地测量重点实验室,武汉430071

出　　处：《地震地磁观测与研究》2022年第4期51-55,共5页Seismological and Geomagnetic Observation and Research

摘　　要：利用应城地震台2018—2022年地磁观测数据,研究了武汉地铁对Z分量的影响特征。结果表明,应城地震台地磁Z分量背景噪声约0.13 nT,自2019年2月开始受到武汉地铁影响,干扰时段数据出现微小的高频突变。干扰强度与地铁的距离、牵引电压、走行轨的绝缘性等有关,距离越近、牵引电压越高干扰幅度越大;多条线路造成的干扰可能存在叠加。采用直流750 V牵引电压的地铁在80 km外干扰强度小于0.2 nT,而采用直流1500 V电压的地铁在相同距离干扰强度大于0.6 nT。Based on the geomagnetic observation data at Yingcheng Seismic Station from 2018 to 2022,the influence characteristics of Wuhan Metro on Z component of geomagnetic observation are studied.The results show that background noise of geomagnetic Z component is about 0.13 nT.The perturbed data shows minimal change with high frequency from February,2019.The perturbation intensity is related to the distance,traction voltage and electrical isolation of subways.The closer the distance and the higher the traction voltage,the greater the perturbation.The perturbation caused by multiple lines may be superimposed.The perturbation intensity of metros with DC 750 V is less than 0.2 nT at the distance of 80 km,while it’s more than 0.6 nT for metros with DC 1500 V.

关 键 词：地磁观测 城市轨道交通 杂散电流 

分 类 号：P315.78[天文地球—地震学]