地电阻率观测的工频干扰分析
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摘要
在地电阻率观测中,电力系统中的工频干扰已成为主要的干扰方式。通过对代县地电阻率的观测数据分析发现:代县地电阻率存在着明显的年变及日变等特征,主要受降雨、气候及固体潮的影响;在工频干扰下的地电阻率数据增加了半日波等高频特征,并且振幅明显增大,严重影响了观测质量。采取输电铁塔上的避雷线绝缘改造措施很好地抑制了工频干扰对地电阻率的影响,该方法对促进地电阻率观测、应用和发展具有很大的现实与参考意义。
Power frequency interference in the power system has become the main interference mode in the geo-resistivity observation. The analysis of the observation data of the resistivity of Dai County in this paper,it is shows that the resistivity of Dai County has obvious characteristics such as annual change and daily change which are mainly affected by rainfall,climate and solid tide,the geo-resistivity data under power frequency interference increases the high frequency characteristics such as half-day wave and the amplitude significantly. Power frequency interference seriously affects the observation quality. The influence of power frequency interference on the georesistivity has suppressed by insulation modification of the lightning conductor on the transmission tower,this method has great practical and reference resoures significance for promoting the observation,application and development of geo-resistivity.
Power frequency interference in the power system has become the main interference mode in the geo-resistivity observation. The analysis of the observation data of the resistivity of Dai County in this paper,it is shows that the resistivity of Dai County has obvious characteristics such as annual change and daily change which are mainly affected by rainfall,climate and solid tide,the geo-resistivity data under power frequency interference increases the high frequency characteristics such as half-day wave and the amplitude significantly. Power frequency interference seriously affects the observation quality. The influence of power frequency interference on the georesistivity has suppressed by insulation modification of the lightning conductor on the transmission tower,this method has great practical and reference resoures significance for promoting the observation,application and development of geo-resistivity.
引文
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[9]张学民,李美,关华平.汶川8.0级地震前的地电阻率异常分析[J].地震,2009,29(1):108-115.
[10]Huang Q H.Retrospective investigation of geophysical data possibly associated with the Ms8.0 Wenchuan earthquake in Sichuan,China[J].Journal of Asian Earth Sciences,2011,41(4-5):421-427.
[11]Lu J,Qian F Y,Zhao Y L.Sensitivity analysis of the Schlumberger monitoring array:application to changes of resistivity prior to the 1976 earthquake in Tangshan,China[J].Tectonophysics,1999,307(3-4):397-405.
[2]杜学彬,李宁,叶青,等.强地震附近视电阻率各向异性变化的原因[J].地球物理学报,2007,50(6):1802-1810.
[3]杜学彬.在地震预报中的两类视电阻率变化[J].中国科学(D辑地球科学),2010,40(10):1321-1330.
[4]高曙德,汤吉,杜学彬,等.汶川8.0级地震前后电磁场的变化特征[J].地球物理学报,2010,53(3):512-525.
[5]桂燮泰,关华平,戴经安.唐山、松潘地震前视电阻率短临异常图象重现性[J].西北地震学报,1989,11(4):71-75.
[6]罗娜,乔子云,寇海川,等.河北省地电场干扰因素分析[J].地震地磁观测与研究,2016,37(6):59-67.
[7]钱复业,赵玉林,于谋明,等.地震前地电阻率的异常变化[J].中国科学(B辑化学),1982,12(9):831-839.
[8]席继楼,赵家骝,关歆莹,等.地电场观测中的工频干扰抑制方法研究[J].2015,35(4):53-63.
[9]张学民,李美,关华平.汶川8.0级地震前的地电阻率异常分析[J].地震,2009,29(1):108-115.
[10]Huang Q H.Retrospective investigation of geophysical data possibly associated with the Ms8.0 Wenchuan earthquake in Sichuan,China[J].Journal of Asian Earth Sciences,2011,41(4-5):421-427.
[11]Lu J,Qian F Y,Zhao Y L.Sensitivity analysis of the Schlumberger monitoring array:application to changes of resistivity prior to the 1976 earthquake in Tangshan,China[J].Tectonophysics,1999,307(3-4):397-405.