井下地电阻率观测异常核实实例
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摘要
针对2015年12月17—19日甘肃省陇南市汉王台地电阻率井下观测三道同步出现的振荡变化,通过现场核实,并对观测数据进行对比分析后得到:此次垂向观测记录到的扰动变化不是来自深部地下介质的电性变化,而是浅部的干扰,可能因素是台站高压电扰动(或变压器漏电)与台站测区草坪浇水导致地表湿润易于传导有关;通过这次异常核实,对井下地电阻率观测有了较为完整的认识,为资料突变核实步骤和分析方法积累了一定经验,也为探讨深井地电阻率变化是否是地震前兆增添了佐证。
Vacillation changes occurred synchronously in three channels of the deep-well geo-electrical resistivity observation at the Hanwang station in the Chinese city of Longnan on December17,2015,and continued until December 24.The cause of these changes could not be determined,so we verified the anomaly on site.After a field survey and a comparative analysis of the observation data,we found that the disturbances were not from changes in the electrical properties of the deep underground medium,but from shallow interference.This could have been a disturbance in the high-voltage power through the station,or an enhanced conduction of the wetting surface caused by watering the grass in the observation area of the station.By identifying this anomaly,a comprehensive understanding of deep-well geo-electrical resistivity observation was acquired,and experience of the verification procedure and analysis method of data mutation was accumulated.
Vacillation changes occurred synchronously in three channels of the deep-well geo-electrical resistivity observation at the Hanwang station in the Chinese city of Longnan on December17,2015,and continued until December 24.The cause of these changes could not be determined,so we verified the anomaly on site.After a field survey and a comparative analysis of the observation data,we found that the disturbances were not from changes in the electrical properties of the deep underground medium,but from shallow interference.This could have been a disturbance in the high-voltage power through the station,or an enhanced conduction of the wetting surface caused by watering the grass in the observation area of the station.By identifying this anomaly,a comprehensive understanding of deep-well geo-electrical resistivity observation was acquired,and experience of the verification procedure and analysis method of data mutation was accumulated.
引文
[1]钱家栋.与大震孕育过程有关的地电阻率变化研究[J].中国地震,1993,9(4):341-350.
[2]赵玉林,钱复业.唐山7.8级强震前震中周围形变电阻率的下降异常[J].地球物理学报,1978,21(3):181-190.
[3]钱复业,赵玉林.地震前地电阻率变化十例[J].地震学报,1980,2(2):78-89.
[4]赵家骝,李海亮,李建,等.用正向供电技术提高视电阻率观测精度[J].西北地震学报,1996,18(2):31-36.
[5]赵和云,张文孝,杨明芝.水平层状介质中不同深度对地表ρs变化的响应特性[J].地震,1985,5(6):35-42.
[6]赵和云.地电阻率趋势变化的形态特征与地震[J].地震学报,1994,16(3):465-474.
[7]DB/T 18.1-2006,地震台站建设规范地电台站第1部分:地电阻率台站[S].北京:地震出版社,2006:2-5.
[8]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,2010,40(10):1321-1330.
[9]赵国泽,王立凤,汤吉,等.地震监测人工源极低频电磁技术(CSELF)新试验[J].地球物理学报,2010,53(3):479-486.
[10]汤吉,詹艳,王立凤,等.5月12日汶川MS8.0地震强余震观测的电磁同震效应[J].地震地质,2008,30(3):739-745.
[11]黄清华.地震电磁信号传播的控制模拟实验[J].科学通报,2005,50(16):1774-1778.
[12]Huang Q.Geophysical Measurements Associated with the MS8.0Wenchuan Earthquake in Sichuan,China[J].Eos Trans AGU,2008,89(53):s52a-02.
[13]Lu J,Xue S Z,Qian F Y,et,al.Unexpected Changesin Resistivity Monitoring for Earthquakes of the Longmenshan in Sichuan,China,with a fixed Schlumberger Soundingarray[J].Phys Earth Planet Inter,2004,145(1-4):87-97.
[14]Ma Q Z.The Boundary Element Method for 3-D dc Resistivity Modeling in Layered Earth[J].Geophysics,2002,67(2):610-617.
[15]冯锐,郝锦绮,周建国.地震监测中的电阻率层析技术[J].地球物理学报,2001,44(6):833-842.
[16]关华平,肖武军.电磁辐射仪“EMAOS”观测结果原理及震例[J].地震,2004,24(1):96-103.
[17]王兰炜,朱旭,朱涛,等.地电阻率多极距观测系统及试验研究[J].地震,2011,31(1):20-31.
[18]席继楼,赵家骝,王燕琼,等.地电场观测技术研究[J].地震,2002,22(2):67-73.
[19]武安绪,张永仙,周元泽,等.基于改进型图像信息方法的汶川地震前电离层参量时空特征研究[J].地球物理学报,2011,54(10):2445-2457.
[20]陈化然,杜爱民,王亚丽,等.地磁低点位移与地磁场等效电流体系关系的初步研究[J].地震学报,2009,31(1):59-67.
[21]张学民,泽仁志玛,申旭辉,等.地震前后电离层截止频率处电场频谱强度变化分析——以2006年汤加MW8.0地震为例[J].地震学报,2011,33(4):451-460.
[22]谭大诚,赵家骝,席继楼,等.青藏高原中强地震前的地电场变异及构成解析[J].地球物理学报,2012,53(3):875-885.
[23]周剑青,郭建芳,朱彦珍,等.地震前昌黎台地电阻率变化特征分析[J].地震工程学报,2014,36(1):120-126.
[24]吉野登志男,行武毅,著.钱复业,译.山崎断层井下电阻率的连续观测[J].世界地震译丛,1983,1(2):55-62.
[25]田山,刘允秀,聂永安,等.地震地电阻率观测改进方法研究——电测井技术的移植应用与数值模型分析[J].地震学报,2009,31(3):272-281.
[26]聂永安,巴振宁,聂瑶.深埋电极的地电阻率观测研究[J].地震学报,2010,32(1):33-40.
[27]陈雪梅,武银,张璇,等.岷县6.6级及芦山7.0级地震前天水地电阻率井下观测资料异常[J].地震工程学报,2013,35(4):816-818.
[28]李乐进.甘肃省地电台址条件研究[J].西北地震学报,1985,7(2):72-76.
[29]高玉芬,钱家栋,赵家骝.地震及前兆数字观测技术规范:电磁观测[M].北京:地震出版社,2001.
(1)安海静.武都井下地电观测建台报告.2013.
[2]赵玉林,钱复业.唐山7.8级强震前震中周围形变电阻率的下降异常[J].地球物理学报,1978,21(3):181-190.
[3]钱复业,赵玉林.地震前地电阻率变化十例[J].地震学报,1980,2(2):78-89.
[4]赵家骝,李海亮,李建,等.用正向供电技术提高视电阻率观测精度[J].西北地震学报,1996,18(2):31-36.
[5]赵和云,张文孝,杨明芝.水平层状介质中不同深度对地表ρs变化的响应特性[J].地震,1985,5(6):35-42.
[6]赵和云.地电阻率趋势变化的形态特征与地震[J].地震学报,1994,16(3):465-474.
[7]DB/T 18.1-2006,地震台站建设规范地电台站第1部分:地电阻率台站[S].北京:地震出版社,2006:2-5.
[8]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,2010,40(10):1321-1330.
[9]赵国泽,王立凤,汤吉,等.地震监测人工源极低频电磁技术(CSELF)新试验[J].地球物理学报,2010,53(3):479-486.
[10]汤吉,詹艳,王立凤,等.5月12日汶川MS8.0地震强余震观测的电磁同震效应[J].地震地质,2008,30(3):739-745.
[11]黄清华.地震电磁信号传播的控制模拟实验[J].科学通报,2005,50(16):1774-1778.
[12]Huang Q.Geophysical Measurements Associated with the MS8.0Wenchuan Earthquake in Sichuan,China[J].Eos Trans AGU,2008,89(53):s52a-02.
[13]Lu J,Xue S Z,Qian F Y,et,al.Unexpected Changesin Resistivity Monitoring for Earthquakes of the Longmenshan in Sichuan,China,with a fixed Schlumberger Soundingarray[J].Phys Earth Planet Inter,2004,145(1-4):87-97.
[14]Ma Q Z.The Boundary Element Method for 3-D dc Resistivity Modeling in Layered Earth[J].Geophysics,2002,67(2):610-617.
[15]冯锐,郝锦绮,周建国.地震监测中的电阻率层析技术[J].地球物理学报,2001,44(6):833-842.
[16]关华平,肖武军.电磁辐射仪“EMAOS”观测结果原理及震例[J].地震,2004,24(1):96-103.
[17]王兰炜,朱旭,朱涛,等.地电阻率多极距观测系统及试验研究[J].地震,2011,31(1):20-31.
[18]席继楼,赵家骝,王燕琼,等.地电场观测技术研究[J].地震,2002,22(2):67-73.
[19]武安绪,张永仙,周元泽,等.基于改进型图像信息方法的汶川地震前电离层参量时空特征研究[J].地球物理学报,2011,54(10):2445-2457.
[20]陈化然,杜爱民,王亚丽,等.地磁低点位移与地磁场等效电流体系关系的初步研究[J].地震学报,2009,31(1):59-67.
[21]张学民,泽仁志玛,申旭辉,等.地震前后电离层截止频率处电场频谱强度变化分析——以2006年汤加MW8.0地震为例[J].地震学报,2011,33(4):451-460.
[22]谭大诚,赵家骝,席继楼,等.青藏高原中强地震前的地电场变异及构成解析[J].地球物理学报,2012,53(3):875-885.
[23]周剑青,郭建芳,朱彦珍,等.地震前昌黎台地电阻率变化特征分析[J].地震工程学报,2014,36(1):120-126.
[24]吉野登志男,行武毅,著.钱复业,译.山崎断层井下电阻率的连续观测[J].世界地震译丛,1983,1(2):55-62.
[25]田山,刘允秀,聂永安,等.地震地电阻率观测改进方法研究——电测井技术的移植应用与数值模型分析[J].地震学报,2009,31(3):272-281.
[26]聂永安,巴振宁,聂瑶.深埋电极的地电阻率观测研究[J].地震学报,2010,32(1):33-40.
[27]陈雪梅,武银,张璇,等.岷县6.6级及芦山7.0级地震前天水地电阻率井下观测资料异常[J].地震工程学报,2013,35(4):816-818.
[28]李乐进.甘肃省地电台址条件研究[J].西北地震学报,1985,7(2):72-76.
[29]高玉芬,钱家栋,赵家骝.地震及前兆数字观测技术规范:电磁观测[M].北京:地震出版社,2001.
(1)安海静.武都井下地电观测建台报告.2013.