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将地震前兆电磁源看成谐变垂直电偶极子，把地面以下视为２层分别均匀各向同性的有耗散线性媒质，采用对赫兹势作柱面波展开的方法求解麦克斯韦方程组，从而得出地下垂直电耦极子在各层媒质中激发的电磁场的积分形式解．
Considering the earthquake precursors electromagnetic source as a harmonic vertical dipole, the ground below is considered as two dissipative linear media with uniform isotropy respectively. The Maxwell equations are solved by applying the Hertzian potential to the cylindrical wave expansion, The integral form solution of the electromagnetic field excited by the underground vertical electric dipole in each layer of medium is obtained.