【摘要】 依据典型震例中的视电性异常变化,介绍了视电性变化各向异性与震源机制解最大主压应力的关系,讨论了电性变化的物理机理。结果表明,视电性变化与饱水裂隙电阻率ρf、固架电阻率ρ0和裂隙率v有关,与DD模式预言的震源区扩容阶段电阻率变化过程,岩(土)标本加载过程中视电阻率变化相吻合,地震电性变化主要是由于孕震晚期阶段震源区及附近扩容裂隙快速发展、导电通道串通、导电流体活跃而引起的。我国地震地电阻率观测确实检测到了这一变化。更多还原

【Abstract】 Based on the apparent electrical variations anomalies in some typical earthquake examples, the relation between apparent electrical variation anisotropy and maximum principal stress from focal mechanism is introduced, the physical mechanism of this variation is discussed. The result shows that the apparent electrical variation is related with cranny ratio v, resistivity of water filled cranny ρ_f and resistivity ρ₀ of inherent framework,and coordinated with the earth-resistivity variation for dilatancy phase of focal region in DD model and that in loading process to rock（soil） sample.The main reasons of electrical variation are development of new-born crannies, connection of conductive channels and movement of conductive liquid near epicenter region during the late phase of strong earthquake preparation. The earth-resistivity observations in China have examined the information of this variation in deed.更多还原