Dual Seismic Migration Velocities in Seismic Swarms

Fluid-induced earthquake sequences generally appear as expanding swarms activating a particular fault. The recent analysis of swarm in the Corinth rift has revealed dual migration pattern, with global slow expansion (m day?1) and episodes rapid (km day?1). Such are interpreted fluid diffusion, which ignores possibility static, dynamic, or aseismic triggering existence migration. Here, we propose new model for such swarms, where earthquakes consist failure asperities on creeping fault infiltrated by fluid. For that, couple rate-and-state friction, nonlinear diffusivity, elasticity along 1D interface. This reproduces speeds observed real swarms. We show that increase linearly mean pressurization not dependent hydraulic traditionally suggested.