A new conception “magnetic shock wave” has been cited in this paper. Physical model of the theory calculation has been established based on the experiment equipment. The conception and production mechanism of the magnetic shock wave has been studied. The propagation characteristic, velocity and attenuation ratio of the magnetic shock wave has been analyzed and calculated. The calculation results show that the magnetic shock wave is a kind of “near filed” excited around of excitation equipment. It should still satisfy the Maxwell equation, and it can still be explained and understood using the classical macroscopic electrodynamics theory. The field is also a kind of broad band instantaneous pulse because the excitation current is a kind of instantaneous pulse. It has very significant dispersion and distortion. The observation result of the different receiving sensor is different in the different distance.

Abnormal electromagnetic radiation associated with seismic activity has been reported across a wide range of frequencies, but its primary energy is concentrated in the super-low-frequency (SLF) and extremely low-frequency (ELF) bands. To estimate the effect of the seismic radiation source, a radiator in a soil foundation was modeled as a horizontal electric dipole (HED), and the propagation characteristics of the electromagnetic fields were studied in the Earth–ionosphere cavity. The expressions of the electromagnetic fields could be obtained according to the reciprocity theorem. Therefore, a new algorithm named the numerical integral algorithm was proposed, which is suitable for both the SLF and ELF bands. The new algorithm was compared with the asymptotic approximation algorithm when the receiving point was not close to the field source and the antipode. The two algorithms were found to be in excellent agreement, confirming the validity of the new algorithm for SLF and ELF bands.

In order to identify the abnormity of the SLF (Super Low Frequency)/ELF (Extremely Low Frequency) electromagnetic radiation before the earthquake, it needs to study the distribution of the spatial SLF/ELF atmospheric radio noise in China. The atmospheric radio noise is substantially the total contribution of the radiation fields excited by the lightning. The main frequency spectrum of the lightning electric current is from VLF (Very Low Frequency) to SLF. The variations of the atmospheric radio noise envelope level root-mean-square value with the frequency can be obtained for the different time periods in the different seasons by analyzing the published data and AD report. It can be obtained the variations of 80Hz atmospheric radio noise envelope level root-mean-square value along the time and the months for the different time periods in the different seasons at Qingdao, Kunming and Huhehaote in China.