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The results of the research of the behavior of radon (RVA radon volumetric activity), released from the massif, are described. Radon migration and its emission from the massif depend on the porosity, permeability and fissility of the massif. A sharp change of the massif strength and a discharge of elastic stresses due to the external forces (earthquake) occur under certain changes in the structure of the massif, both during compression and tension of the massif. According to the results obtained from the reflection of changes in the geodynamic state of the geological environment during tectonic earthquakes preparation for areas with bending deformations, changes in RVA and temperature occur when the ratio of the magnitude to the logarithm of the epicenter distance is more than 2.5.

Assessment of Sensitivity Zone of Radon and Temperature Measurements in Study of Process of Tectonic Earthquakes Preparation