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

Nield, Grace A.; King, Matt A.; Steffen, Rebekka; Blank, Bas

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


Authors

Matt A. King

Rebekka Steffen

Bas Blank



Abstract

We present a finite-element model of post-seismic solid Earth deformation built in the software package Abaqus (version 2018). The model is global and spherical, includes self-gravitation and is built for the purpose of calculating post-seismic deformation in the far field (>∼ 300 km) of major earthquakes. An earthquake is simulated by prescribing slip on a fault plane in the mesh and the model relaxes under the resulting change in stress. Both linear Maxwell and biviscous (Burgers) rheological models have been implemented and the model can be easily adapted to include different rheological models and lateral variations in Earth structure, a particular advantage over existing models. We benchmark the model against an analytical coseismic solution and an existing open-source post-seismic model code, demonstrating good agreement for all fault geometries tested. Due to the inclusion of self-gravity, the model has the potential for predicting deformation in response to multiple sources of stress change, for example, changing ice thickness in tectonically active regions.

Citation

Nield, G. A., King, M. A., Steffen, R., & Blank, B. (2022). A global, spherical finite-element model for post-seismic deformation using Abaqus. Geoscientific Model Development, 15(6), 2489-2503. https://doi.org/10.5194/gmd-15-2489-2022

Journal Article Type Article
Acceptance Date Mar 6, 2022
Online Publication Date Mar 25, 2022
Publication Date Mar 21, 2022
Deposit Date Jul 4, 2022
Publicly Available Date Jul 4, 2022
Journal Geoscientific Model Development
Print ISSN 1991-959X
Publisher European Geosciences Union
Peer Reviewed Peer Reviewed
Volume 15
Issue 6
Pages 2489-2503
DOI https://doi.org/10.5194/gmd-15-2489-2022

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