【摘要】 采用异常频次累加法和异常频次变化速率法研究了中强地震前后一定范围内地下流体群体异常随时间的演化特征．结果表明：地震前后地下流体异常频次累加曲线和变化速率曲线变化特征表现为“平稳（零值波动）—加速（连续正值）—恢复（连续负值）”３个阶段；地震与异常的关系表现为“加速（连续正值）—地震”的形式．利用该方法可以对地下流体异常性质（即非震异常、震前异常和震后异常）进行一定程度的定量判别．更多还原

【Abstract】 Using the analytical methods of anomaly frequency accumulation and change velocity,evolution character of ground fluid group anomalies with time before and after moderate and strong earthquakes in proper areas is studied.The results show that the ground fluid anomaly frequency accumulation curve and change velocity curve before and after earthquake exhibits three processes:stable (zero value fluctuation)—accelerating (successive positive value)—recovering (successive negative value).The changes of anomaly accelerated before earthquake.By using this method,anomaly character of ground fluid can be judged quantitatively in certain degree.The method also may be applied to judge anomaly nature of other kinds of precursory observation items.更多还原