科研之友
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摘要
Firstly, we got the telluric current by calculating geoelectric field and near-surface media resistivity around the geoelectric station sites, and then separated the vortex current from the telluric current field; Secondly, we calculated the geomagnetic induction electric field (GIE) in frequency domain using the observed geoelectric storm data, according to plane wave theory and horizontal electric layer model; Finally, we got the geomagnetically induced currents (GIC) calculated by GIE. Comparing the calculated results with the measured values, it showed that: the results of GIE and the measured geoelectric storms had good phase congruency; the GIC vortex center was drifted about 3 SE relative to the geoelectric storm vortex's; when the magnetic storm happened, the maximum region in the amplitude contour map of the Z component of the geomagnetic field was coincident with the vortex center, it may be responsible for the GIC vortex center drift. The equivalent ring current model based on electromagnetic induction principle may help explain the mechanism of how the vortex current form in a certain degree. This work can be applied to the inter-calibration of geomagnetic and geoelectric observation, meanwhile, it's useful for recognizing the geoelectric storm influence on the distribution of telluric current.
- 出版日期2017-5
- 单位中国地震局; 中国地震局地震预测研究所
