吉林龙井台阵环境噪声源分析

Analysis of Environmental Noise Sources for the Jilin Longjing Seismic Array

摘要: 为评估吉林龙井地震台阵观测环境状态，保障边境地区地震监测效能，本文通过实地摸排与连续地震观测，系统开展了台阵周边30 km范围内的环境噪声源调研，并将现今噪声功率谱与台阵试运行阶段的进行对比，综合评价了台阵所属9个子台环境噪声水平。结果表明，龙井台阵整体观测环境保持稳定，周围存在8类噪声源，其中地面观测环境受乡村道路通行和乡镇农工业生产的影响在高频段(1 Hz以上)较试运行期间略有抬升，但对监测效能影响不大；井下观测环境较试运行期间变化不大，整体噪声环境仍处于良好状态。台阵7个子台噪声水平达到I类台站要求，其中A0、A1子台受附近一般工厂影响处于II类台站观测标准。

Abstract: To evaluate the observational environment of the Jilin Longjing Seismic Array and ensure its seismic monitoring performance in border areas, this study systematically conducted an investigation of environmental noise sources within a 30 km radius around the array through field reconnaissance and continuous seismic observation. We compared the current noise power spectral density with that recorded during the array’s commissioning phase, and comprehensively assessed the environmental noise levels of all 9 sub-stations belonging to the array. The results show that the overall observational environment of the Longjing Seismic Array remains stable, with 8 categories of noise sources identified in the surrounding area. Among them, the surface observation environment, affected by traffic on rural roads and agricultural and industrial production in towns and townships, is slightly elevated in the high-frequency band (above 1 Hz) compared with that during the commissioning phase, but exerts a negligible effect on the monitoring performance. The downhole observation environment has little change from the commissioning phase, and its overall noise environment remains in good condition. 7 sub-stations of the array meet the requirements for Class I seismic stations, while the A0 and A1 sub-stations only comply with the observation standard for Class II stations due to interference from nearby ordinary industrial facilities.