3.2 Modeling of Post-seismic Deformation
Post-seismic deformation includes afterslip on the fault interface, viscoelastic relaxation of the surrounding material, and poroelastic rebound due to fluid flow driven by pressure changes due to the coseismic rupture. Hu et al. (2014) studied the poroelastic rebound contribution following the 2011 Tohoku earthquake and found that the poroelastic rebound contribution to surface deformation is mainly limited to the vicinity of the rupture area. In our case, we only have one GPS continuous site (AC13) that is located at the updip end of the coseismic rupture zone. Thus, here we only take afterslip and viscoelastic relaxation into consideration. We model stress driven afterslip and include a 2.5D model for viscoelastic relaxation.