  Earthquake faults occur in networks that have dynamical modes not displayed
by single isolated faults. Using simulations of the network of strike-slip
faults in southern California, we find that the physics depends critically on
both the interactions among the faults, which are determined by the geometry of
the fault network, as well as on the stress dissipation properties of the
nonlinear frictional physics, similar to the dynamics of integrate-and-fire
neural networks.
