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汞的地球化学行为取决于汞的物理化学性质．汞在地震活动过程中的异常变化十分明显，映震效能较好。通过分析主要震例发现，汞异常特征普遍表现为高值或正脉冲及其脉冲群。异常分布范围与震级大小有关。一般来说是在异常结束后发震，但也有的是在高值段或异常恢复段发震。异常一般出现于震前几天到几个月不等。
Mercury’s geochemical behavior depends on the physico-chemical properties of mercury. Mercury in the process of anomalous changes in the earthquake is obvious, reflecting the earthquake better performance. By analyzing the major earthquakes, it is found that mercury anomalies generally show high or positive impulses and their impulses. The range of anomaly distribution is related to magnitude. In general it is after the abnormal end of the earthquake, but also in some high-value section or abnormal recovery section seismogenic. Abnormalities generally occur in a few days before the earthquake to several months.