关键词: 水氡, 异常, 流体动力学

Abstract: The rock dynamic mechanism is now overemphasied in the study of the mechanism for water radon anomalies as the precursor of earthquakes. This model suggests that the microfracturing of rock releases radon during the late period of earthquake pregnancy. A great deal of observations indicate, however, that water-radon anomalies can occur in the early time of earthquake pregnancy and wells far from epicentres, where rocks of water bearing layers can hardly be in the state of microfracture. So we propose the hydrodynamic mechanism for the water-radon anolmalies which suggests that the water-radon anolmalies can be casued by deformation of water-bearing rock mass and changes of its hydrodynamic state under the low stress level.

Key words: Radon in groundwater, Anomaly, Hydrodynamics