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.