本文着重讨论了地壳内埋深约10—25km的高阻层原地条件下的导电机理,指出该层岩体导电性主要取决于其裂隙及孔隙情况和孔隙水在其中的分布。根据对部分熔体导电性的研究,对实际岩体电导率进行数字模拟发现,连接权因子增加可导致该层原地体积电阻率极大的减少。本文还分析了孔隙水参与下震源及其外围区的应力应变特征,阐明了可能出现的深部电性变化前兆的分区性及其区域的体积电阻率、电性各向异性变化特征,初步探讨了这些变化的物理机理,粗略地估计了可能的变化量值。 This paper focuses on the conductive mechanism of the high resistivity layer with a depth of about 10-25 km buried in the crust, and points out that the conductivity of the rock mass depends mainly on its fracture and pore distribution and pore water distribution. According to the study on the conductivity of some melts, numerical simulation of the conductivity of the actual rock mass shows that the increase of the connection weight factor can lead to the great decrease of the volume resistivity of the layer in situ. The paper also analyzes the stress and strain characteristics that the pore water participates in the hypocenter and the surrounding area, expounds the possible subregion of the deep electric change precursors and the volume resistivity and electric anisotropy of the area, The physical mechanism of these changes roughly estimates the possible magnitude of the change.