Abstract
A lot of observational data both at home and abroad suggested that before some strong earthquakes anomalous variations of radon concentration appear in the chemical composition of groundwater. In order to further study these anomalies and get reliable precursory anomalies, a special packet of precursory data processing has been developed recently. By using a computer program of first-order difference method, it is discovered that the scatter of radon content increased systematically before earthquakes at some observation posts where observational conditions are fairly good. This change may be a new criterion for evaluating short-term and imminent earthquake precursors.
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