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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gmd-2020-107
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-107
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: development and technical paper 24 Jun 2020

Submitted as: development and technical paper | 24 Jun 2020

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This preprint is currently under review for the journal GMD.

A global,spherical,finite-element model for postseismic deformation using ABAQUS

Grace A. Nield1,2, Matt A. King1, Rebekka Steffen3, and Bas Blank4 Grace A. Nield et al.
  • 1Surveying and Spatial Sciences, School of Technology, Environments and Design, University of Tasmania, Australia
  • 2Department of Geography, Durham University, Durham, UK
  • 3Lantmäteriet, Gävle, Sweden
  • 4Faculty of Aerospace Engineering, Delft University of Technology, Delft, NL

Abstract. We present a finite-element model of postseismic solid Earth deformation built in the software package ABAQUS (version 2018). The model is global and spherical, and includes self-gravitation and is built for the purpose of calculating postseismic 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 postseismic model, 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.

Grace A. Nield et al.

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Short summary
In this study we present a finite-element model of postseismic solid Earth deformation, that is, a model of how the Earth deforms viscoelastically in the months and years following an earthquake. Our model specifically focuses on distances of around 300 km and further from the earthquake source, which is particularly relevant for large earthquakes (approximately greater than magnitude 7). We benchmark the model against existing codes to demonstrate its accuracy for future case studies.
In this study we present a finite-element model of postseismic solid Earth deformation, that is,...
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