【摘要】 采用异常频次累加法和异常频次变化速率法研究了水化群体异常随时间的演化特征及其与地震的关系。结果表明，利用该方法可以对水化异常性质（即无震、震前、震后异常）进行判别，证明该方法对震情的判别和地震预报具有重要的实用意义。同时，该方法也可用于其它类型前兆观测项目异常性质的判别，具有广阔的发展前景。更多还原

【Abstract】 In this paper,by using the methods of anomaly frequency accumulation and change velocity,we studied the time evolution character of hydrogeochemical group anomalies and the relationship between them and earthquake.The results,by using the method we may judge the nature of hydrogeochemical anomaly(as no earthquake,before earthquake and after earthquake ),proved that the method has important practical sense to judge earthquake situation and predict earthquake.Moreover,by using the method we also may judge anomaly nature of other kinds of precursory observation items,it has vast developing prospect.更多还原