Abstract: Earthquake geoelectric field observation in Beijing area is subject to serious interference from urban rail transit. In this paper,the interferences to the geo-electrical field observation data over the years from urban rail transit in Beijing area are analyzed. According to the characteristics of rail transit operation,FFT spectral analysis is performed on the seriously disturbed geoelectric field observation data of Tongzhou station to extract the data of normal variation from the geo-electric field observations; meanwhile,methods of processing of such disturbed data are also addressed.

Key words: geoelectric field observation, urban rail transit, interference, spectrum analysis, Beijing area

摘要： 北京地区地电场观测受到城市轨道交通等严重干扰。文中分析了北京地区多年来的地电场观测数据受城市轨道交通干扰的情况，根据轨道交通的运行特点，对干扰严重的通州台地电场观测数据进行了FFT谱分析，提取出地电场观测的正常变化数据，并对此类干扰的数据处理方法进行了探讨。

关键词: 城市轨道干扰, 地电场观测, 谱分析, 北京地区