摘要
地铁运行对应城地震监测站地电场观测造成显著干扰,其中最大干扰幅度可达33 mV/km,平均干扰幅度约14 mV/km。为改善观测数据质量,对比分析应城地震监测站地电场正常日变化和干扰数据的时频特征,分别采用均值滤波、经验模态分解和数学形态学滤波方法对干扰数据进行滤波处理,并对比分析几种方法的滤波效果,及形态学结构元素的尺度因子对滤波结构的影响。结果表明,使用均值滤波和广义形态学滤波方法,可有效去除地电场地铁干扰,建议受地铁干扰的地电场台站使用以上2种方法对观测数据进行处理,以提升其使用效能。
The subway operation causes significant interference to the ground electric field observation of Yingcheng Seismic Station,and the maximum interference amplitude was about 33 mV/km and the average interference amplitude was about 14 mV/km.In order to improve the quality of observation data,the time-frequency characteristics of the normal daily variation of the ground electric field and the interference data of Yingcheng Seismic Station are compared and analyzed.The filtering methods of mean filtering,empirical mode decomposition and mathematical morphology filtering are respectively used to filter the interference data.The filtering effects of several methods and the influence of the scale factor of morphological structure elements on the filtering structure are compared and analyzed.The results show that the means filtering and generalized morphological filtering can effectively remove the geoelectric field subway interference.The above two methods are recommended for the geoelectric field stations affected by subway interference to process the observation data,so as to improve their use efficiency.
作者
陈星星
张建涛
王明贵
周超
CHEN Xingxing;ZHANG Jiantao;WANG Minggui;ZHOU Chao(Institute of Seismology,China Earthquake Administration,Wuhan 430071,China;Hubei Key Laboratory of Earthquake Early Warning,Wuhan 430071,China;Hubei Earthquake Administration,Wuhan 430071,China;Henan Surveying and Mapping Geographic Information Technology Center,Zhengzhou 450003,China)
出处
《地震地磁观测与研究》
2024年第3期100-106,共7页
Seismological and Geomagnetic Observation and Research
基金
中国地震局地震监测、预报、科研三结合课题(课题编号:3JH-202301056)。
关键词
地电场
地铁干扰
滤波算法
适用性
geoelectric field
subway interference
filtering algorithm
applicability
