SPEAR: SPectral element based EARthquake cycle simulator

Numerical simulation of long-term earthquake cycles on a two-dimensional vertical strike-slip fault with dynamic treatment of inertial effects. Written in Julia.

Current Status

v1.0

Features

• Antiplane strain deformation on planar fault with SH waves
• Fully dynamic treatment of seismic events
• Rate-and-state-dependent friction with aging laws
• Adaptive time-stepping to switch between interseismic and seismic events
• Customizable to include off-fault and on-fault heterogeneities
• Complex geometry of fault damage zones including gaussian and trapezoid fault damage zones
• Time-dependent healing of fault damage zones constrained by observations

Dependencies

• Julia version >= 1.1
• Algebraic Mulltigrid
• Iterative Solvers
• FEMSparse

Quickstart guide

1. Install Julia >= 1.1 (preferably the latest version).
2. Run install_dependencies.jl script to install the specific packages.
3. Open run.jl and edit the output file name and the resolution of the problem.
4. Run run.jl from the terminal or IDE of your choice.
5. The output files are saved in data/$(simulation_name).
6. You can look at the output file from analyze_results.jl.
7. For basic testing run julia tests/basic_test_01.jl to look at two plots saved in the plots/$(simulation_name) directory.

Documentation

• Coming soon

Screenshots

References

Please cite the following if using this code:

Thakur, P., Huang, Y., & Kaneko, Y. Effects of low‐velocity fault damage zones on long‐term earthquake behaviors on mature strike‐slip faults. Journal of Geophysical Research: Solid Earth, e2020JB019587.

Kaneko, Y., Ampuero, J. P., & Lapusta, N. (2011). Spectral‐element simulations of long‐term fault slip: Effect of low‐rigidity layers on earthquake‐cycle dynamics. Journal of Geophysical Research: Solid Earth, 116(B10).