New insights on the postseismic processes

Task manager: M. Vergnolle
Participants: M. Vergnolle, F. Cappa, R. Hassani, 2-yrs postdoctoral researcher.

In Work Package 3, we will improve our understanding of the physical parameters (e.g. fault friction, through suitable physical laws) controlling fault slip and ruptures through mechanical afterslip simulations. We will also investigate the physics implicitly considered for the poroelastic crustal relaxation after an earthquake through hydromechanical models that will integrate fluid diffusion, strain-dependent permeability, and poroelastic stress. Reinforced with this knowledge, we will implement postseismic multi-process models to infer the evolution of the different contributions with time from the early postseismic phase.

Based on results obtained in WP1 and WP2, our objective in WP3 is to obtain:

• Estimation of relevant physical properties of the Earth crust and lithosphere (e.g. frictional parameters, fluid pressure, permeability).
• Test whether kinematics results sustain physically derived friction law.
• Test on the spatial relationship between (co-)seismic and aseismic slip.
• A priori fault scenarios and sensitivity of postseismic deformation to fluid flow and comparison with available postseismic data.
• Test on the evolution of the contribution of the different postseismic processes with time from the early postseismic phase.