Geodynamic Models Connecting the Seismic Timescale to the Tectonic Timescale
Description:
In Yang et al [2023], we demonstrated a numerical approach to solving the coupled tectonic and seismic-rupture problem in three dimensions using a modified version of the Underworld python software package that is optimised for tectonic and geodynamic modelling (www.underworldcode.org). We were able to meet a number of simple benchmark cases by introducing momentum terms and a non-linear, viscoelastic constitutive model with rate-state frictional behaviour in a priori specified fault zones.
This is a very intense computational problem that identified a number of pain-points for generalising our formulation to understand the two-way interaction between tectonics and earthquake cycles. These include: very large variations in resolution between fault regions and the embedding lithosphere; and comparable changes in the timestepping requirements between tectonic deformation and co-seismic deformation. In Underworld, the tracking of material properties, momentum / stress-history terms, and damage over significant strain is handled by a swarm of Lagrangian particles which we determined also required very high resolution.
We report our latest developments on a spatially-adaptive, unstructured, highly parallel, Lagrangian/Eulerian numerical tool (Underworld3) which is specifically targetted at problems of this nature. Underworld3 is designed to be particularly user-friendly - it integrates with the jupyter notebook system, is fully introspective and is fully integrated with the sympy package which allows mathematical introspection as well as the usual ability to probe running code that is common in jupyter.
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Yang, H., Moresi, L., Weng, H., & Giordani, J. (2023). Numerical Modeling of Earthquake Cycles Based On Navier‐Stokes Equations With Viscoelastic‐Plasticity Rheology.Geochemistry, Geophysics, Geosystems, 24(9), e2023GC010872. https://doi.org/10.1029/2023GC010872
Session: From Geodynamics to Earthquake Rupture, Models That Cross Time- and Length-Scales [Poster Session]
Type: Poster
Date: 5/3/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Louis
Student Presenter: No
Invited Presentation:
Authors
Louis Moresi Presenting Author Corresponding Author louis.moresi@anu.edu.au Australian National University |
Haibin Yang haibin.yang@zju.edu.cn Zhejiang University |
Julian Giordani julian.giordani@sydney.edu.au Sydney University |
Ben Knight ben.knight@curtin.edu.au Curtin University |
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Geodynamic Models Connecting the Seismic Timescale to the Tectonic Timescale
Category
From Geodynamics to Earthquake Rupture, Models That Cross Time- and Length-Scales