邕宁地震台地磁观测一次特殊干扰分析

摘要

There were some synchronized spike interferences appeared at second recording data of GM4 and FHDZ-M15 magnetometers at Yongning Seismic Station since June 26, 2015. By analyzing the changed characteristics of special interference, the possibility of observation system, farm tools, HVDC, lightning and ferromagnetic material of municipal roads had been ruled out. Calculating by the Biot-Savart law, it is believed that stray current was likely to be a source of interference. Combined with the surrounding environment of Yongning Seismic Station, it is found that the stray current maybe come from the leakage of residential electricity equipment, municipal construction, the subway running electricity and other electrical equipment.%2015年6月26日以来邕宁地震台GM4和FHDZ-M15磁力仪秒记录数据出现同步尖峰异常，分析此次特殊干扰的变化特征，排除了观测系统、农具、高压直流输电、雷电、市政修路铁磁性物质干扰的可能。利用毕奥—萨伐尔定律进行计算，发现干扰源为杂散电流的可能性较大。结合邕宁地震台周边环境推测，居民用电设备、市政施工、地铁试运行通电等用电设备漏电均可能产生杂散电流。