红山台地磁观测车辆干扰特征研究  

Research on Vehicle Interference Characteristics of Geomagnetic Observations at Hongshan Station

作　　者：胡秀娟 和少鹏[1,2] 郭鹏昆 田勤 贾立峰 HU Xiu-juan;HE Shao-peng;GUO Peng-kun;TIAN Qin;JIA Li-feng(National Field Scientific Observation and Research Station for Huge Thick Sediments and Seismic Disasters in Hongshan,Xingtai 054000,China;Xingtai Earthquake Monitoring Center Station,Hebei Earthquake Agency,Xingtai 054000,China;Hebei Earthquake Station,Hebei Earthquake Agency,,Shijiazhuang 050021,China)

机构地区：[1]河北红山巨厚沉积与地震灾害国家野外科学观测研究站,河北邢台054000 [2]河北省地震局邢台地震监测中心站,河北邢台054000 [3]河北省地震局河北地震台,河北石家庄050021

出　　处：《地震》2024年第2期147-158,共12页Earthquake

基　　金：中国地震局地震科技星火计划项目(XH23006A);红山野外站科研专项(DZ2021110500003,DZ2021121300001)。

摘　　要：近年来,红山台地磁观测数据中多次出现因车辆干扰而引起的异常变化,对台站观测资料的完整率产生相当程度的影响。在红山台实地开展车辆干扰影响实验的基础上,本文重点分析了轻型卡车及其他不同类型车辆在公路行驶过程中对地磁观测数据的影响特征。结果表明,车辆对观测数据产生的干扰影响与其使用的材质密切相关,车辆铁磁性材质的磁化率值越大,影响的距离越远。干扰的强度随着距离增大逐渐衰减,轻型卡车在距离测点300 m处、重型卡车在距离测点120 m处,两者的干扰影响基本消失。轻型卡车干扰幅度的理论值和实验值一致性较好,重型卡车干扰幅度的理论值和实验值却相差很大。这种差异可能还与不同类型车辆的构造、大小、体积和设计的差异有关。结合观测数据各分量受车辆干扰所表现的形态,初步判断车辆产生的干扰磁场总体呈现出磁轴与地面平行的偶极子磁场特征。此外,频谱分析表明,D和H分量均在车辆行驶时间段出现明显的谱峰,车辆行驶速度越快频率越高。此项工作可为今后识别地磁观测数据中的车辆干扰影响提供依据。In recent years, the geomagnetic observation data from the Hongshan observatory have repeatedly shown abnormal variations due to vehicle interference, which has seriously affected the completeness of the data. Based on field experiments conducted at the Hongshan observatory, this paper focuses on analyzing the impact characteristics of light trucks and other types of vehicles on geomagnetic observation data during their transit on roads. The results indicate that the interference effect on observation data caused by vehicles is closely related to the materials they are made of, the greater the magnetic susceptibility of a vehicle's material, the greater the distance of influence. The intensity of the interference decreases gradually with the increase of distance and the interference effects of light trucks at 300 m from the measurement point and heavy trucks at 120 m from the measurement point basically disappear. The theoretical values of interference magnitude for light trucks are well aligned with the experimental results, whereas for heavy trucks, there is a significant discrepancy between the theoretical and experimental values. This difference may also be related to the variations in construction, size, volume, and design among different types of vehicles. By examining the patterns exhibited by the various components of the observation data under vehicle interference, it is preliminarily inferred that the interference magnetic field generated by the vehicles is characterized by a dipolar magnetic field with a magnetic axis parallel to the ground. Additionally, spectral analysis shows that both the D and H components exhibit distinct spectral peaks during the vehicles are in motion, with higher frequencies corresponding to higher vehicle speeds. This study provides meaningful evidence for the future identification of vehicular interference effects in geomagnetic observation data.

关 键 词：地磁台站 地磁观测 车辆干扰 

分 类 号：P318.6[天文地球—固体地球物理学]