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摘要
Electromagnetic induction in the Earth's interior is an important contributor to the near-Earth geomagnetic and telluric current. The telluric current induced by geomagnetic storms. generates secondary geoelectric storms. This motionally induced geoelectric field can be detected in the sea or inland and has. potential for electrical soundings of the Earth. This work is aimed at gaining an understanding of the distribution of the current signal due to geomagnetic storms. In this paper, by comparing the geoelectric field during. storms. and at. quiet times, as well as comparing the telluric current calculation results of eastern China and local stations, the following. conclusions are obtained. (1) A large range of amplitude change ratios of. geoelectric storms is affected by latitude: the amplitude ratio rises at higher latitudes, and the high-frequency composition of. geoelectric storms is more complicated than that of. geomagnetic storms. (2) The storm creates a large area of electromagnetic fluctuations, and influences the distribution of the telluric current. (3) On the basis of previous studies, a spatial eddy current model is used, which can explain the observation phenomena well. At the same time, a further study direction is put forward on. Earth's electromagnetism.
- 出版日期2017-6-1
- 单位中国地震局; 中国地震局兰州地震研究所
