Abstract
Radon concentrations in soil gas at two sampling sites were studied to determine if these exhibited significant temporal and quantitative relationships with a number of earthquakes, the epicenters of which were some 90 km from the radon sampling stations. Measurements were made by sampling soil gas at different depths. The magnitudes of the earthquakes ranged from 2 to 4. While both positive and negative precursory perturbations of radon concentrations were observed, in some cases the perturbations were detected after the earthquakes, and several earthquakes occurred without any perturbation of the radon signal being observed, either before or after the events. The study was also aimed at evaluating exhalation of soil radon as an early warning of imminent earthquake activity but meteorological factors were observed to interfere with, or mask the signal so that radon exhalation alone does not appear to be a reliable parameter for predicting earthquakes.
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