Influence of Slip Rate and System Stiffness on Fault Slip Characteristic

In order to research the factors which influence the sliding behavior of active fault,the single degree freedom of springblock model and the rate-state dependent friction law are introduced,the static force equation of spring-block is built,and the Runge-Kutta method is used to solve the nonlinear equations.The result shows that the response of the system increases with the rise of the slip rate,and the system inclines to hold stable when its stiffness increases.As the active fault slides,the system is unstable when its stiffness is below the critical stiffness,the track of system keeps away from stable dot,and the system shows periodic sliding and the track of system forms a limit circle when its stiffness equals to the critical stiffness, the amplitude of stress increases with the rise of the slip rate,and the system tends to evolve forward stable state after a short periodical slipping when its stiffness is greater than the critical stiffness.