Analysis of factors affecting the disturbance of geoelectric field observation at Wengtian station
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摘要: 海南省文昌翁田台地电场数据质量自2019年3月开始下降，地电场数据质量下降主要表现为日相关系数偏低、北南向长极距与短极距数据曲线呈反向变化、绝缘度趋向于零等情况。2019年3月—2020年10月，我们分别对观测室装置系统、室外外线路、连接口等逐一进行详细的排查工作和电极、电缆的对比实验工作，最终确定影响因素为电极故障和电缆线破损造成绝缘度下降。并在2020年10月进行了电缆线改造。2020年11月开始翁田台地电场数据质量回升，日相关系数恢复至0.8以上、六测道数据曲线变化一致和外线路绝缘度恢复至150 MΩ以上。经过此次翁田台地电场数据受干扰因素的排查，得出一些经验方法，希望给其他安装地电场仪器的台站提供借鉴。Abstract: The quality of the geoelectric field data of Wenchang Wengtian station in Hainan Province has been declining since March 2019. The quality of the geoelectric field data has declined mainly due to the low daily correlation coefficient, the reverse change of the north-south long pole distance and short pole distance data curves, and the degree of insulation tends to a zero-level situation. From March 2019 to October 2020, we carried out detailed investigations and comparison experiments of electrodes and cables on the observation room installation system, outdoor and external lines, connection ports, etc., and carried out renovation of the cable line in October 2020. Starting from November 2020, the quality of the electric field data of the Wengtian station has recovered, the daily line relationship number has recovered to more than 0.8, the data curves of the six measurement channels have changed the same, and the insulation of the external line has recovered to more than 150 MΩ. After the experience of investigating the interference factors of the electric field data of Wengtian station, some methods have been obtained, hoping to serve as a reference for other stations that have installed geoelectric field instruments.
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Key words:
- ZD9A-2B type /
- geoelectric field data /
- daily correlation coefficient /
- insulation degree
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图 4 2018年1月翁田台日变曲线图
Figure 4. Daily variation curves of Wengtian station in January 2018
图 6 日相关系数图 (2019-03-01—2020-02-28)
Figure 6. Daily correlation coefficient map (2019-03-01—2020-02-28)
图 7 地电场NS向长短极曲线图
Figure 7. North-south long and short pole curves of geoelectric field
图 8 ZD9A-2B型大地电场仪观测系统框图
Figure 8. Block diagram of ZD9A-2B geodetic electric field instrument observation system
图 9 更换NS向长极与短极电缆线数据图
Figure 9. Data diagram of replacing the long and short pole cables of north-south direction
图 10 更换EW向长短极电缆线前后对比图
Figure 10. Comparison chart before and after replacing the long and short pole cables of east-west direction
图 14 NS短极出现不定时干扰曲线图 (2020-08-06—19)
Figure 14. Irregular interference curves of NS short pole (2020-08-06—19)
图 15 2020-11-04—10地电场日变曲线
Figure 15. Daily variation curves of geoelectric field from 2020-11-04 to 10
图 16 2020-11-01—12-31日相关系数图
Figure 16. Correlation coefficient diagram from 2020-11-01 to 12-31
表 1 外线路绝缘度测量表（单位：兆欧）
Table 1. External circuit insulation measurement table (unit：MΩ)
日期
（年-月-日）公共极O1 公共极O2 NS向
（长极）NS向
（短极）EW向
（长极）EW向
（短极）2019-03-20 1000 1000 1000 1000 1000 200 2019-06-24 500 500 35 100 1000 1000 2019-07-18 1000 1000 50 1.5 500 200 2019-07-18（更换另一条芯） 1000 1000 500 400 1000 1000 2019-09-24 50 1000 50 2 2 0.2 2019-12-17 35 10 无穷大 400 800 300 2019-12-26 12 15 0.2 2 0.2 0.2 
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表 2 2020年10月27日外线路绝缘度测量表(单位：兆欧)
Table 2. External circuit insulation measurement table on 2020-10-27 (unit：MΩ)
日期
（年-月-日）公共极O1 公共极O2 NS向
（长极）NS向
（短极）EW向
（长极）EW向
（短极）2020-10-27 150 200 1000 150 500 200
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[1] 周卫东,牛延平,田野,等. 电磁卫星地面对比观测原型系统地电场观测资料特征分析[J]. 地震工程学报,2020,42(6):1517-1522 doi: 10.3969/j.issn.1000-0844.2020.06.1517Zhou W D,Niu Y P,Tian Y,et al. Characteristics of geoelectric field data from a ground-based comparative observation system of electromagnetic satellites[J]. China Earthquake Engineering Journal,2020,42(6):1517-1522 doi: 10.3969/j.issn.1000-0844.2020.06.1517 [2] 李飞,史红军,高研,等. 2018年松原M5.7地震前地电场变化特征研究[J]. 华南地震,2020,40(3):92-101Li F,Shi H J,Gao Y,et al. Study on the change characteristics of geoelectric field before the Songyuan M5.7 earthquake in 2018[J]. South China Journal of Seismology,2020,40(3):92-101 [3] Dimmock A P,Rosenqvist L,Welling D T,et al. On the regional variability of dB/dt and its significance to GIC[J]. Space Weather,2020,18(8):e2020SW002497 [4] 李瑞卿,郭学增,张蕾,等. 地电场电极故障判定及机理分析[J]. 地震工程学报,2020,42(2):438-446 doi: 10.3969/j.issn.1000-0844.2020.02.438Li R Q,Guo X Z,Zhang L,et al. Fault determination and mechanism analysis for electrodes in the geoelectric field[J]. China Earthquake Engineering Journal,2020,42(2):438-446 doi: 10.3969/j.issn.1000-0844.2020.02.438 [5] 王宇,谭大诚,王玮铭. 南北地震带两次典型强震周边自然电场变化及机理探讨[J]. 地震工程学报,2020,42(5):1085-1089 doi: 10.3969/j.issn.1000-0844.2020.05.1085Wang Y,Tan D C,Wang W M. Change and mechanism of spontaneous potential field around two typical strong earthquakes in the north-south seismic zone[J]. China Earthquake Engineering Journal,2020,42(5):1085-1089 doi: 10.3969/j.issn.1000-0844.2020.05.1085 [6] 章鑫,孙君嵩,钱银苹,等. 天祝台阵地电场季节变化及其两种影响因素分析[J]. 地震,2020,40(4):169-182 doi: 10.12196/j.issn.1000-3274.2020.04.013Zhang X,Sun J S,Qian Y P,et al. Seasonal variation of geoelectric field in Tianzhu array and its influence of two factors[J]. Earthquake,2020,40(4):169-182 doi: 10.12196/j.issn.1000-3274.2020.04.013 [7] 王玮铭,谭大诚. 同场地多方位多极距地电场相关特性[J]. 地震学报,2020,42(4):419-434Wang W M,Tan D C. Correlation characteristics of the geoelectric field with multi-azimuth and multi-pole distance for the same field[J]. Acta Seismologica Sinica,2020,42(4):419-434 [8] 孙君嵩,杜学彬,王丽,等. 地电扰动指数GEI研究[J]. 地球物理学报,2018,61(11):4493-4503 doi: 10.6038/cjg2018L0485Sun J S,Du X B,Wang L,et al. Study on the geoelectric index (GEI)[J]. Chinese Journal of Geophysics,2018,61(11):4493-4503 doi: 10.6038/cjg2018L0485 [9] 章鑫,王丽,杜学彬. 大地电流研究进展与展望[J]. 地球科学进展,2016,31(7):708-717 doi: 10.11867/j.issn.1001-8166.2016.07.0708.Zhang X,Wang L,Du X B. A review of studies on the telluric currents[J]. Advances in Earth Science,2016,31(7):708-717 doi: 10.11867/j.issn.1001-8166.2016.07.0708. [10] 张彩艳,李飞,苏宏伟. 甘肃大地电场的变化特征分析[J]. 震灾防御技术,2015,10(2):435-446 doi: 10.11899/zzfy20150225Zhang C Y,Li F,Su H W. Characteristics and variation analysis of observation data from geoelectric monitoring network of Gansu Province[J]. Technology for Earthquake Disaster Prevention,2015,10(2):435-446 doi: 10.11899/zzfy20150225 [11] 王志栋,安张辉,张成军,等. 甘肃武威南营地电场干扰识别及排除[J]. 高原地震,2019,31(3):48-53,47 doi: 10.3969/j.issn.1005-586X.2019.03.009Wang Z D,An Z H,Zhang C J,et al. The interference identification and elimination of Wuwei Nanying geoelectric field station in Gansu Province[J]. Plateau Earthquake Research,2019,31(3):48-53,47 doi: 10.3969/j.issn.1005-586X.2019.03.009 [12] 史红军,赵卫星,李宁,等. 榆树地震台地电比对观测分析[J]. 防灾减灾学报,2019,35(3):51-57Shi H J,Zhao W X,Li N,et al. Comparison observation analysis of earth electricity at Yushu seismic station[J]. Journal of Disaster Prevention and Reduction,2019,35(3):51-57 [13] 王丽红, 朱石军, 王同利,等. 北京地电台网典型干扰及影响因素浅析[J]. 地震科学进展,2021,51(12):560-568Wang L H,Zhu S J,Wang T L,et al. Analysis of typical interference and influence factors of Beijing geoelectric field observation network[J]. Progress in Earthquake Sciences,2021,51(12):560-568 [14] 范晔,崔腾发,杜学彬,等. 中国大陆地电场日变化特征及影响因素[J]. 中国地震,2020,36(2):234-243Fan Y,Cui T F,Du X B,et al. Characteristics and related influence factors of the diurnal variation of geoelectric field in Chinese mainland[J]. Earthquake Research in China,2020,36(2):234-243 -
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