Abstract:In this paper, according to the analyse of short term temporal anomaly of radon content in ground water for some strong and moderate earthquakes in Gansu and near regions in the last few years, such as Songpan earthquake (Ms=7.2) in Sichuan, Lixian earthquake (Ms=5.0) in Gansu, Haiyuan earthquake (Ms=5.5) in Ningxia and based upon the data of 139 times of the impending earthquake sudden change of radon content in wells for fifty strong and moderate earthquakes collected and analysed, a net work system of setting up observation points with detecting capability of radon content has been proposed. In case the sudden change of impending earthquake of radon content, that is speedy ascending or drop for a short term, takes place at the observation point, it may be regarded as a probable forerunner signal of occurring strong or moderate earthquakes. In accordance with the above-mentioned probable rule, a strongest earthquake (Ms=4.1) in Wuwei, Gansu on June 8, in 1982 had been predicted. The prediction was in conformity with the occurrence of the earthquake in time, magnitude and place.
