水平电偶极子在三层媒质中激发的电磁场特征的数值研究

Study of Numerical Value of the Electro-magnetic Field Feature Excitated in Three-layer Media by Horizontal Electric Dipole

将空气及地面以下两层视为三层有耗散的线性媒质 ,求出第三层中的水平偶极子激发的电磁场在地表处的积分形式解 ,进行数值计算 ,分析其频谱特征。结果表明电磁辐射异常的优势频率为 0～ 2Hz,与实际观测资料相吻合 ,在超低频或甚低频 ,有比较明显的电磁场异常。并讨论其对地震电磁辐射监测的指导意义。

In this paper,the air and the underground media are taken as three-layer linear media with dissipation and the integral solution of electro-magnetic field on the surface excited by horizontal electric dipole in the third layer is got.So,the numerical value is calculated and the spectra features are andlyzed,The results show that the preponderant frepuency of the electro-magnetic radiation anomaly is from 0Hz to 2Hz,which is corresponding to the actually observed data.There are more obvious anomalies of electro-magnetic fields for the ultra-low frequency and very low frequency.Further,the leading significance to the electro-magnetic radiation monitoring is discussed.