【摘要】 2023年4月，在日常观察地震预警曲线中发现汉南基本站曲线异常，呈纺锤形。通过参考参阅相关的资料并讨论分析，初步拟定了排查方案。经过一系列排查步骤后，最终判断是基本站附近的自来水厂开泵排污引起的干扰。此次故障较为特殊，可以为地震系统运维工作提供经验，提高运维效率。更多还原

【Abstract】 In April 2023, during daily observation of the earthquake warning curve, it was found that the curve of the Hannan basic station was abnormal, showing a spindle shape. By referring to relevant materials and discussing and analyzing, a preliminary investigation plan has been formulated. After a series of investigation steps, it was ultimately determined that the interference was caused by the sewage discharge from the water plant near the basic station. This fault is quite special and can provide experience for the operation and maintenance of the seismic system, improving the efficiency of operation and maintenance.更多还原