【摘要】 本文研究了提取多参数无量纲地震前兆信息的均方差方法的物理基础。该方法的物理基础是地震孕育过程中当破裂应力达到５０％以上时，岩石弹性、变形性、电性、磁性和热性等性质都会发生显著变化，结果导致岩体物理参数绝对值及其变化速率和测量误差的改变。利用均方差方法来计算这些变化，一方面消除了前兆参数的季节性干扰，另一方面突出了前兆信息。更多还原

【Abstract】 In this paper,the physical base of the mean square deflection method extracting informa-tion of multi-parameter earthquake precursors has been studied.The physical base of thismethod is that rock properties including elasticity,deformational property,electric property,magnetic property,thermal property and so on will change obviously when crushing stressreaches up to more than 50 percent during earthquake preparation,which results in changes ofabsolute value,variation rate and measuring error of rock physical parameters.To calculatethe changes by using the mean square deflection method,on one hand,eliminates the seasonalinterference of precursor parameters,on the other hand,gives prominence to the precursoryinformations.更多还原