On numerical simulation method of the seismic electromagnetic anomaly in porous stratified media
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摘要: 本文针对电激发模型在各向同性分层介质中利用传播矩阵方法对电磁异常产生过程的数值模拟.层状模型中一部分为饱和多孔介质，另一部分为普通线弹性介质，数值模拟过程中将固体场作为主要场单独进行计算，而将其形变作为等效流体源计算耦合电磁场.模拟结果显示，地震波在经过饱和多孔介质边界的时候会产生电磁场，而其在流体层内部传播的过程中则未产生电磁异常.模拟结果可以用于解释一些伴随地震产生的电磁异常，包括地震发生时以及地震波到达时所产生的电磁异常现象，另一方面对于前震及其它一些无感地震所产生的电磁异常的解释也具有一定的参考价值.Abstract: This paper focuses on numerical simulation of the seismic electro-magnetic anomaly generation process in isotropic layered medium by means of propagation-matrix method. For the layered model, some are fluid-saturated porous medium, and the others are linear elastic medium. During the simulation, the solid field is taken as a principal field and calculated individually, and its deformation is taken as the equivalent fluid source. The simulation results show that when the seismic wave goes through the boundary of the fluid-saturated porous medium, the electromagnetic (EM) wave is generated simultaneously, which can be used to illustrate the seismic EM anomaly accompanied by seismic source or the seismic wave. On the other hand, it can elucidate EM signal coupled with the foreshock or the tremor.
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图 1 普通层状介质模型(a)和加入含水层的孔隙介质模型(b)
Figure 1. Common stratified media model (a) and stratified media model with fluid-saturated porous layer (b)
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图 3 含水层上界面固体场位移
Figure 3. Displacement of the solid field from the upper boundary of the fluid-saturated layer
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图 4 含水层上界面电场
Figure 4. The electric field from the upper boundary of the fluid-saturated layer
表 1 含水层参数
Table 1 Parameter of the saturated layer
地层
编号φ κ0/m2 C0
/(mol·L-1)ρs
/(103kg·m-3)ρf
/(103kg·m-3)σ0
/(10-4S·m-1)L0
/(10-9s·C·kg-1)2 0.1 10-13 0.001 2.65 1.0 4.64 2.443 
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