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Environmental radioactivity and earthquake: A possible signature or a real trigger?
Radon as a possible candidate for earthquake precursor has been studied for a long period. It has been suggested as one of several possible early signals, and its groundwater anomalies associated with earthquakes and water-rock interactions were detected in several seismogenic areas worldwide. Nevertheless, there is no clear evidence that it is really a good precursor. For evaluating the usefulness of uranium isotopes as earthquake precursor, groundwater uranium concentrations and activity ratios have been analysed as well as the mechanical behavior of uranium crystal under high temperature and high pressure conditions in a possible earthquake nucleation point.