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《Earthquake》 1994-01
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NUMERICAL SIMULATION OF PORE PRESSURE AND GROUND WATER LEVEL VARIATION IN EARTHQUAKE PREPARATION

Zhang Yongxian Shi Yaolin Zhang Guomin ( Center for Analysis and Prediction, SSB ) ( Graduate school, Academia Sinica )  
The paper analysed stress and strain field including the effect of rock dilatancy and fault creeping in earthquake preparation, according to coupling equation of stress and pore pressure field, the pore pressure field variation along with stress field can be calculated. The results showd that the variation of pore pressure are related to intensity of stress variation and capacity of medium osmosis. First extremum area of pore pressure concentrated at fault extreme, then turned to middle of blocking part according to fault creeping in earthquake preparation. In the later period of earthquake preparation, the source was the dilatant area as well as pore pressure in most area was negative, which can explain why the ground water level changed abnormally before earthquakes. The ground water flow can make us easier to understand the mechanism of occurred anomlies, such as water Radon, water chemistry and water temperature and so on.
【CateGory Index】: P315
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