Pore-pressure diffusion controls upper-plate aftershocks of the 2014 Iquique earthquake.

ABSTRACT: Upper-plate aftershocks following megathrust earthquakes are particularly dangerous as they may occur close to densely populated regions. Aftershock numbers decay with time, imposing a time-dependent seismic hazard that is assessed with statistical forecast models. While coseismic static stress transfer cannot explain this time-dependency, transient postseismic deformation due to afterslip, viscoelastic relaxation, and pore-pressure diffusion are potential candidates. Here we demonstrate which postseismic process is the key driver of the upper-plate aftershocks pattern following the 2014 M_w = 8.2 Iquique earthquake in northern Chile. We first use a 4D (space and time) model approach to reproduce the postseismic deformation observed in geodetic data. We then analyze the spatiotem

SUBMITTER: Pena C 

PROVIDER: S-EPMC12559721 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature