[1] [1] Pirjola R. Review on the calculation of surface electric and magnetic fields and of geomagnetically induced currents in ground-based technological systems［J］. Surveys in Geophysics, 2002, 23(1):71-90.

[2] [2] Tay H C, Swift G W. On the problem of transformer overheating due to geomagnetically induced currents［J］. IEEE Power Engineering Review, 1985, 5(1):48-49.

[3] [3] Zheng K, Pirjola R J, Boteler D H, et al. Geoelectric fields due to small-scale and large-scale source currents［J］. IEEE Trans Power Delivery, 2013, 28(1):442-449.

[4] [4] Zheng K, Trichtchenko L, Pirjola R, et al. Effects of geophysical parameters on GIC illustrated by benchmark network modeling［J］. IEEE Trans Power Delivery, 2013, 28(2):1183-1191.

[6] [6] Weaver J T. Electromagnetic induction in thin sheet conductivity anomalies at the surface of the earth［J］. Proceedings of the IEEE, 1979, 67(7):1044-1050.

[7] [7] Gilbert J L. Modeling the effect of the ocean-land interface on induced electric fields during geomagnetic storms［J］. Space Weather-the International Journal of Research & Applications, 2005, 3(4):211.

[11] [11] Püthe C, Kuvshinov A , Khan A , et al. A new model of Earth’s radial conductivity structure derived from over 10 yr of satellite and observatory magnetic data［J］. Geophysical Journal International, 2016, 203(3):1864-1872.