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地震 ›› 1998, Vol. 18 ›› Issue (S1): 109-114.

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南京台地电地磁同场观测的实验研究

钱家栋1), 沈红会2), 刘广宽2), 王海云2)   

  1. 1) 中国北京 100036 中国地震局分析预报中心;
    2) 中国南京 210014 江苏省地震局
  • 收稿日期:1998-06-16 修回日期:1998-06-23 出版日期:1998-10-20 发布日期:2022-09-30
  • 作者简介:钱家栋,男,1940年12月出生,研究员,主要从事电磁预报地震方法、前兆机理、孕震过程数值模拟等研究工作。

EXPERIMENTAL RESEARCH ON SYNTHETIC OBSERVATION OF APPARENT RESISTIVITY AND GEOMAGNETISM AT NANJING SEISMIC STATION

Qian Jiadong1), Shen Honghuia2), Liu Guangkuan2), Wang Haiyun2)   

  1. 1) Center for Analysis and Prediction, CSB, Beijing 100036, China;
    2) Seismological Bureau of Jiangsu Province, Nanjing 210014, China
  • Received:1998-06-16 Revised:1998-06-23 Online:1998-10-20 Published:2022-09-30

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摘要： 在南京地震 台地电观测场地改造的同时,对地电地磁同场地观测中出现的矛盾开展了深人的实验研究。结果表明,该台地磁房与地电NS测线供电线路中连接供电极的单线段的距离过近,是导致地电供电时在地磁垂直分量上产生短时脉冲的主要原因。用长直导线电流的磁场所作的数值模拟,与实验结果相当吻合。新的地电场地布局方案充分应用了这些研究结果,妥善解决了这一遗留问题,同时为解决我国地磁台网中若干台站类似问题提供了有益的经验。

关键词: 地磁, 地电场地, 南京地震台

Abstract: The experimental study on problems in the synthetic observation of apparent resistivi-ty and geomagnetism at Nanjing seismic station is conducted when its observation system for apparent resistivity was reformed last year. It indicates that the short distance (50 m) between the geomagnetic observation room and the current line connected to the current electrodes would be the main reason for the short term pulse 5.7 nT in the vertical compo-nent of geomagnetic records, as power supply provides the current of 1.8 A to the ground through the line for measuring apparent resistivity. The numerical modelling of the mag-netic field caused by long straight conducting wire current with 1.8 A gives very good ex-planation for all the observed facts, which leads to an adequate suggestion for the new de-sign of apparent resistivity monitoring at the station. These experimental and theoretical results could be applied at those stations with synthetic observation similar to Nanjing sta-tion.

Key words: Geomagnetic field, Geoelectric field, Nanjing seismic station