Add Gmsh Mesh Generation for subduction-3d Example #844
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This pull request contains the code to generate the subduction-3d example using Gmsh instead of Cubit. The Gmsh-based workflow also incorporates topography for the region.
Topographic data is sourced from the GMTED2010 dataset. You can download the necessary files using the ./download_topography.sh script, which retrieves topography at a 30-arc-second spatial resolution.
To convert the topography into a usable NetCDF format, use the generate_localdem.py script. This script requires the GDAL package and is responsible for generating the NetCDF input consumed by generate_gmsh.py.
If a higher-resolution topography is desired, you can manually download the appropriate data and update the file paths in generate_localdem.py accordingly.