水氡异常（）是指地下。在多次大地震前已观测到这种现象 其原因可能是地应力的变化，使岩石释放出一定量的氡气，而导致地下水中氡气含量的变化。水氡异常的观测是地震监测的一种手段。
采用“改进从属函数法”，其定襄水氡异常与华北多次强震有明显对应关系；
By using the method of improved hypotaxis function relation, the anomaly of radon in Dingxiang spring is evidently correlated to several strong earthquakes in North China.
研究结果认为，海南水氡异常对地震的预报效能评分为0 4，表明水氡异常与地震活动有关；
The calculated earthquake prediction effective value of radon anomalies at Hainan station is about 0.4. The result shows that radon anomalies have something to do with earthquakes.
大同地震前多井出现水氡的趋势性正异常，是与张北地震水化前兆最显著的不同之处。
Before the Datong earthquake, water radon in many Wells showed trend positive anomalies, which is obviously different with the hydrochemical precursors of Zhangbei earthquake.
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