河北昌黎地震台地电场观测数据干扰排查与分析

地震台站地电场观测会受到各种因素的干扰，必须快速发现并消除干扰源，以保障观测数据的正常输出。2019年5月17日—6月4日，昌黎地震台地电场观测受不明原因干扰，观测数据产生畸变，与已知干扰类型数据特征进行对比分析，发现与常见干扰源所致数据变化形态特征不同；按照干扰数据变化特征，假设干扰源与观测台站的相对位置关系，布设简易的野外观测点，成功定位本次观测干扰源。最终确认，昌黎台地电场干扰由位于台站东南方向的铁件铸造厂变压器电缆漏电所致。此次干扰源排查，可为同类地电台站观测数据干扰分析提供参考。

Investigation and analysis of geoelectric field observation interference at Hebei Changli Seismic Station

The geoelectric field observation at seismic stations can be disturbed by various factors, and the interference sources should be positioned and eliminated instantly to guarantee the usual observation output. From May 17 to June 4 in 2019, the observation of geoelectric field at Changli Seismic Station was interfered by unknown factors, and the usual observation data became distorted. Firstly, the interfered observations were compared with that of generally-known interference sources. The results indicated that they were totally different from those curves generated by the generally-known interference sources; and then some simple but highly efficient field test points in terms of spatial relationships were laid out to find out the interference points. Finally, it is confirmed that the interference of Changli Seismic Station is caused by the leakage of transfer cable in iron casting plant located southeast of the station. The investigation of interference source dealt in the paper provides technical ideas and reference data for other geoelectric seismic stations to carry out similar screening work.