大地电流研究进展与展望

doi:10.11867/j.issn.1001-8166.2016.07.0708.

回顾了关于大地电流的研究历史和当前大地电流研究所取得的成果,包括大地电流的场源理论、传播途径和频谱特点,重点探讨了大地电流方法在构造勘察方面的应用以及大地电流变异与地震活动的关系等问题,同时提出了对大地电流空间分布及涡旋现象研究的几点新认识。此外,根据大地电流的最新研究成果和相关数据处理新方法,总结出关于大地电流研究的5类新思路。对大地电流研究新成果和新方法的展示,可以促进对大地电流的深入研究,对探索更好的数据处理方法和该学科的发展具有一定的启示意义。

关键词: 大地电流, 地电场, 涡旋, GIC

This paper reviewed the history of telluric current research, and the recently achieved results, including telluric current field source, transmission, spectral characteristics, and focused on the discussion of the application of telluric current and its relationship with seismic activities and so on. Meanwhile some new cognition of telluric current study was proposed. What’s more, based on the latest telluric current research and new data processing new method, five new ideas on telluric current research were summarized. The demonstration of new results and new methods of telluric current study may promote further research on it and also it has certain enlightenment significance to explore better data processing methods and the development of the subject.

Key words: Telluric currents, Geoelectric field, Vortex, GIC.

中图分类号:

P319

图1 大地电流测量与流线图示
(a)大地电流测量(据参考文献 [54]修改);(b)表征在某平面上大地电流流向低阻

Fig.1 The illustrations of telluric current measurement and streamline
(a) The principle of telluric current measurement(modified after reference[54]); (b) Characterization of current flows in a plane

图2 等效环电流模型示意图
(a)电磁感应产生的正涡旋;(b)导电层倾斜的一种偏心涡旋

Fig.2 The illustration of equivalent ring current
(a) Eddy current generated by electromagnetic induction; (b) Eccentric eddy due to the inclination of the conductive layer

图3 南北地震带邻区流线分布和地块构造划分
(a)南北地震带大地电流流线分布 ^{[

65
]};(b) 海原断裂邻区矢量图 ^{[

65
]};(c) 南北地震带两侧地块划分

Fig.3 The streamlines distribution and the block structure of north-south seismic belt area
(a)The streamlines distribution of North-South seismic belt region ^{[

65
]};(b) Telluric current vector distribution of Haiyuan fault area ^{[

65
]}; (c) The block structure of north-south seismic belt area

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摘要

A Review of Studies on the Telluric Currents