A SEISMICITY MODEL BASED ON PSEUDO 3D FINITE ELEMENT METHOD
LIU JIE 1) SHI YAO LIN 2) ZHANG GUO MIN 1) 1) Center for Analysis and Prediction, China Seismological Bureau, Beijing\ 100036, China 2) Graduate School, Chinese Academy of Sciences, Beijing\ 100039, China
A dynamic model of seismicity evolution is built based on finite element method according to cell automation model. In the model, the stress increase rate of each cell is obtained by boundary condition and cell medium parameter distribution using finite element method. When each cell is assumed as definite initial stress and frictional coefficient, the broken time of each cell is determined by breaking rule. After a cell is broken, the stress adjustments of the other cells in the system are obtained by finite element method using the broken cell as inner boundary. According the above rules, the seismicity model with 30×40 points is built under the condition of constant displacement rate. The dynamic evolution of the regional stress field, seismicity patterns and effects of various parameter changes on seismicity are discussed. The model presented in this paper shows some advantages and practical usefulness in seismicity research.