V.I. Outkin, A.K. Yurkov

Institute of Geophysics of Ural's Branch of RAS, Yekaterinburg, 620016; e-mail: voutkin@mail.ru

Monitoring of soil radon has showed the positive results, yet Rn behaviour prior to such geodynamic events as earthquakes and mountain impacts lies beyond one single scheme. We studied the Rn behaviour at the time of mountain impacts in the Severouralsk bauxite mines and during earthquakes at San Andreas Fault and at the Northern Tien Shan. The paper shows that the certain changes in the radon field are observed 90-100 days prior to the seismic event. The data prove high reliability of the results of radon monitoring while studying the earthquake preparation process.

Keywords: monitoring of the radon, stress condition, preparation of earthquake.