Collection of GMT (Generic Mapping Tools) scripts and files (including digitized map content, colormaps, grid files etc.). All scripts should run with GMT versions >= 5.2.1 and < 6.0.0 . Each directory in this repository represents a single stand-alone application (individual manuals in pdf format are included as well):

Some directories include Jupyter Notebooks in which I use PyGMT, a Python interface for GMT (Tian et al., 2024) to generate the individual maps and plots (see the ▶️ symbol).

• 001_map_equidist_EQ: plotting global seismicity between 1960 and 2023 on equidistant map ▶️ Jupyter Notebook
• 002_map_equidist_EQ_GCMT: plotting focal mechanisms ("beach balls") of the global seismicity between 1964 and 2019 on equidistant map
• 003_map_seafloor_ages: plotting the ages of oceanic lithosphere on a global map ▶️ Jupyter Notebook
• 004_map_splitting_database: plotting the content of the shear-wave splitting data base on a global map
• 005_map_equidist_siberia: plotting an equidistant map centered on NW Siberia (and raypaths)
• 006_map_SKS_SKKS_areas: visualizing of SKS-SKKS pierce point areas in the D" layer ▶️ Jupyter Notebook
• 007_map_SKS_SKKS_pierce_points: reproducing SKS-SKKS pierce point figures of Grund & Ritter (2019), Geology
• 008_map_scan_tectonic: visualizing geological and tectonic content of Fennoscandia ▶️ Jupyter Notebook
• 009_paper_GR2020: ▶️ Jupyter Notebooks to reproduce some figures presented in our paper Grund & Ritter (2020), GJI
• 010_paper_RFSG2022: ▶️ Jupyter Notebook to reproduce figure 1 presented in our paper Ritter, Fröhlich, Sanz Alonso & Grund (2022) Journal of Seismology

If you make use of the content in this repository please acknowledge GMT (e.g. Wessel et al., 2013; 2019), PyGMT (Tian et al., 2024), our published papers and/or my PhD thesis in whose framework several of the scripts and notebooks were developed:

• Ritter, J.R.R., Fröhlich, Y., Sanz Alonso, Y. & Grund, M. (2022), Short-scale laterally varying SK(K)S shear wave splitting at BFO, Germany – implications for the determination of anisotropic structures, Journal of Seismology, 26, 1137-1156, https://doi.org/10.1007/s10950-022-10112-w.

• Grund, M. & Ritter, J.R.R. (2020), Shear-wave splitting beneath Fennoscandia - Evidence for dipping structures and laterally varying multilayer anisotropy, Geophysical Journal International, 223, 1525–1547, https://doi.org/10.1093/gji/ggaa388.

• Grund, M. & Ritter, J.R.R. (2019), Widespread seismic anisotropy in Earth’s lowermost mantle beneath the Atlantic and Siberia, Geology, 47(2), 123–126, https://doi.org/10.1130/G45514.1.

• Grund, M. (2019), Exploring geodynamics at different depths with shear wave splitting, Dissertation, Karlsruhe Institute of Technology (KIT), https://doi.org/10.5445/IR/1000091425.

Although I now work outside of academia as a data scientist, I provide these GMT/PyGMT examples and notebooks in the hope that they will be useful for other students, scientists or interested map creators.

Final figure outputs of a few examples are shown below. Details and further references can be found in the individual directories.

• Tian, D., Uieda, L., Leong, W. J., Schlitzer, W., Fröhlich, Y., Grund, M., Jones, M., Toney, L., Yao, J., Magen, Y., Jing-Hui, T., Materna, K., Belem, A., Newton, T., Anant, A., Ziebarth, M., Quinn, J., & Wessel, P. (2024), PyGMT: A Python interface for the Generic Mapping Tools, v0.11.0, Zenodo, https://zenodo.org/records/10578540.
• Wessel, P., Luis, J. F., Uieda, L., Scharroo, R., Wobbe, F., Smith, W. H. F. & Tian, D. (2019), The generic mapping tools version 6. Geochemistry, Geophysics, Geosystems, 20(11), 5556-5564, https://doi.org/10.1029/2019GC008515.
• Wessel, P., Smith, W. H. F., Scharroo, R., Luis, J., & Wobbe, F. (2013), Generic mapping tools: improved version released. Eos, Transactions American Geophysical Union, 94(45), 409-410, https://doi.org/10.1002/2013EO450001.