Study On Numerical Simulation Method Of Isochronological Electromagnetic Field Anomaly In Layered Porous Media

The electromagnetic(EM) anomaly triggered by the development and occurrence of an earthquake has been a hotspots of geological research. However, due to the difficulty of the experiment and the shortness of the physical model, we have not developed a universal theory to elucidate all the EM anomaly coupled with the fracture. One of the reasons is that the EM anomaly triggered by the concomitant earthquake is a complex physics process. And a single theory or few principle is hard to govern the phenomena. On the other hand, the existing theory is in the primary stage and may be nor perfect. Seismic electromagnetic coupling is one of the most promising way of early warning. With the development of the theory and the simulation of EM anomaly accompany with the earthquake, it can be expected that the relevant theory would play an important role in disaster reduction, earthquake early warning and even in earthquake prediction.In this article, the electrokinetic effect model is selected. Firstly, a simplified model is established according to the accuracy of the observation system and physical problem used to explain. And then we analysis the validation requirements. According to the physical problem and the partial differential equations of the physical model, finite difference method, finite elements metod and discrete wave number method are considered. And then weigh the advantages and disadvantages of the numerical methods by their complexity and feasibility. Finally wave number method is elected to get the numerical solution of the electrokinetic model. I take the solid field as a principal field and calculate it individually. Deformation of the solid field is taken as the equivalent fluid source.Firstly, according to the result, I find that when the seismic wave goes through the boundary of the fluid-saturated porous medium, the EM wave is generated simultaneously. And there is no electromagnetic anomaly in the inner flow of the porous medium. Secondly the amplitude of EM field induced by the parameter of fluid field is contrasted and analyzed. And then the relationship between the amplitude of seismic and EM wave is analyzed comparing with the reality. The final step of my research is to value the model of electrokinetic model by its reliability and applicability.