红山台地磁观测车辆干扰特征研究

doi:10.12196/j.issn.1000-3274.2024.02.010

Abstract

Abstract: 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.

Key words: Geomagnetic stations, Geomagnetic observation, Vehicle interference

CLC Number:

P318.6

HU Xiu-juan, HE Shao-peng, GUO Peng-kun, TIAN Qin, JIA Li-feng. Research on Vehicle Interference Characteristics of Geomagnetic Observations at Hongshan Station[J]. EARTHQUAKE, 2024, 44(2): 147-158.

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Research on Vehicle Interference Characteristics of Geomagnetic Observations at Hongshan Station

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