A global, spherical finite-element model for post-seismic deformation using Abaqus

[摘要] We present a finite-element model of post-seismic solidEarth deformation built in the software package Abaqus (version 2018). The modelis global and spherical, includes self-gravitation and is built for thepurpose of calculating post-seismic deformation in the far field( > ∼ 300  km) of major earthquakes. An earthquake issimulated by prescribing slip on a fault plane in the mesh and the modelrelaxes under the resulting change in stress. Both linear Maxwell andbiviscous (Burgers) rheological models have been implemented and the modelcan be easily adapted to include different rheological models and lateralvariations in Earth structure, a particular advantage over existing models.We benchmark the model against an analytical coseismic solution and anexisting open-source post-seismic model code, demonstrating good agreementfor all fault geometries tested. Due to the inclusion of self-gravity, themodel has the potential for predicting deformation in response to multiplesources of stress change, for example, changing ice thickness intectonically active regions.

[学科分类] 土木及结构工程学