Influence of Fluids on Earthquakes Based on Numerical Modeling

The strength and sliding behavior of faults in the crust is largely controlled by friction effective stress, which itself modulated fluid pressure. Most earthquake models assume a fixed pore pressure despite widespread evidence that varies strongly time due to changes permeability. Here we explore how dynamic influence properties earthquakes upper crust. To study this problem develop two dimensional model incorporates slow tectonic loading generation during interseismic period with frictional on thrust fault whose permeability evolves slip. We find presence relatively modest overpressures tends reduce coseismic slip, stress drop, maximum velocity, rupture velocity recurrence compared without fluids. Our produces wide range velocities from rapid earthquakes, occur high pressures prior rupture. also show for aftershocks are driven transfer along plane after mainshock. Overall, shows fluids can exert an important crust, mostly modulation variations permeability, lesser extent poro-elastic coupling.