seismic-tomography-models

In this database, I collected several whole mantle tomography models. I converted them into nc files for conformity and easy-access. Each nc files contain 4 variables: depth, longitude, latitude and "v". The "v"alues could represent:

• S wave or P wave speed (in km/s)
• S wave or P velocity purturbation (%)
• density (in kg/m^3)
• attenuation factor Q
• anisotropic parameters
• etc.

Please refer to the file name and the comments within each nc files for the meaning of "v"alue.

The c++ tools to read the nc files and to get value at certain location are provided in src

Dependencies are

• netcdf-4.6.1
• (optional, for plotting) GMT-5.4.4

Here are details about data sources and preprocessings to make these nc files:

1. GyPSuM_vs.nc
   Paper : [Simmons et al., 2010] https://doi.org/10.1029/2010JB007631
   Download link: http://ds.iris.edu/spud/earthmodel/10131119 (netCDF binary of S velocity expressed as km/s)
   Changes : rename variable "vs" to "v".

2. GyPSuM_vp.nc
   Paper : [Simmons et al., 2010] https://doi.org/10.1029/2010JB007631
   Download link: http://ds.iris.edu/spud/earthmodel/10131119 (netCDF binary of P velocity expressed as km/s)
   Changes : rename variable "vp" to "v".

3. SEMum_vs.nc
   Paper : [Lekic and Romanowicz, 2011] https://doi.org/10.1111/j.1365-246X.2011.04969.x
   Download link: http://ds.iris.edu/spud/earthmodel/10131263 (the netCDF binary for the above model expressed as absolute velocity)
   Changes : lose variable "xi", rename variable "vs" to "v".

4. SEMum_xi.nc
   Paper : [Lekic and Romanowicz, 2011] https://doi.org/10.1111/j.1365-246X.2011.04969.x
   Download link: http://ds.iris.edu/spud/earthmodel/10131263 (the netCDF binary for the above model expressed as absolute velocity)
   Changes : lose variable "vs", rename variable "xi" to "v". xi= (vsh^2/vsv^2).

5. MITP08_dvp.nc
   Paper : [Li et al., 2008] https://doi.org/10.1029/2007GC001806
   Download link: https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2007GC001806&file=ggge1202-sup-0002-ds01.txt.gz
   Changes : convert the ascii file into nc file, rename variable "dvp" to "v", see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_MITP08_dvp.cpp

6. MITP08_vp.nc
   Paper : [Li et al., 2008] https://doi.org/10.1029/2007GC001806
   Download link: https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2007GC001806&file=ggge1202-sup-0002-ds01.txt.gz
   Changes : convert dvp into vp using ak135 reference model and create this nc file in which "v" representing "vp, km/s", see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_MITP08_vp.cpp

7. SAW642AN_vs.nc
   Paper : [Panning and Romanowicz, 2006] https://doi.org/10.1111/j.1365-246X.2006.03100.x
   Download link: http://ds.iris.edu/spud/earthmodel/10131202 (the netCDF binary for the above model expressed in km/s)
   Changes : lose variables "vp", "rho", "Qs", rename variable "vs" to "v".

8. SAW642AN_vp.nc
   Paper : [Panning and Romanowicz, 2006] https://doi.org/10.1111/j.1365-246X.2006.03100.x
   Download link: http://ds.iris.edu/spud/earthmodel/10131202 (the netCDF binary for the above model expressed in km/s)
   Changes : lose variables "vs", "rho", "Qs", rename variable "vp" to "v".

9. SAW642AN_rho.nc
   Paper : [Panning and Romanowicz, 2006] https://doi.org/10.1111/j.1365-246X.2006.03100.x
   Download link: http://ds.iris.edu/spud/earthmodel/10131202 (the netCDF binary for the above model expressed in km/s)
   Changes : lose variables "vs", "vp", "Qs", rename variable "rho" to "v".

10. SAW642AN_qs.nc
    Paper : [Panning and Romanowicz, 2006] https://doi.org/10.1111/j.1365-246X.2006.03100.x
    Download link: http://ds.iris.edu/spud/earthmodel/10131202 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vp", "rho", rename variable "Qs" to "v".

11. SAW642ANb_vs.nc
    Paper : [Panning and Romanowicz, 2010] https://doi.org/10.1029/2010JB007520
    Download link: http://ds.iris.edu/spud/earthmodel/10131193 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vp", "rho", "Qs", rename variable "vs" to "v".

12. SAW642ANb_vp.nc
    Paper : [Panning and Romanowicz, 2010] https://doi.org/10.1029/2010JB007520
    Download link: http://ds.iris.edu/spud/earthmodel/10131193 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "rho", "Qs", rename variable "vp" to "v".

13. SAW642ANb_rho.nc
    Paper : [Panning and Romanowicz, 2010] https://doi.org/10.1029/2010JB007520
    Download link: http://ds.iris.edu/spud/earthmodel/10131193 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vp", "Qs", rename variable "rho" to "v".

14. SAW642ANb_qs.nc
    Paper : [Panning and Romanowicz, 2010] https://doi.org/10.1029/2010JB007520
    Download link: http://ds.iris.edu/spud/earthmodel/10131193 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vp", "rho", rename variable "Qs" to "v".

15. SAW24B16_vs.nc
    Paper : [Megnin and Romanowicz, 2000] https://doi.org/10.1046/j.1365-246X.2000.00298.x
    Download link: http://ds.iris.edu/spud/earthmodel/10131184 (The netCDF binary for the above 2°x2° model expressed as S-velocity in km/s)
    Changes : rename variable "vsh" to "v".

16. S362ANI_vs.nc
    Paper : [Kustowski et al., 2008] https://doi.org/10.1029/2007JB005169
    Download link: http://ds.iris.edu/spud/earthmodel/10131231 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vsv", "vsh", rename variable "vs" to "v".

17. S362ANI_vsv.nc
    Paper : [Kustowski et al., 2008] https://doi.org/10.1029/2007JB005169
    Download link: http://ds.iris.edu/spud/earthmodel/10131231 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vsh", rename variable "vsv" to "v".

18. S362ANI_vsh.nc
    Paper : [Kustowski et al., 2008] https://doi.org/10.1029/2007JB005169
    Download link: http://ds.iris.edu/spud/earthmodel/10131231 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vsv", rename variable "vsh" to "v".

19. S362ANI+M_vs.nc
    Paper : [Moulik and Ekstrom] https://doi.org/10.1093/gji/ggu356
    Download link: http://ds.iris.edu/spud/earthmodel/10131294 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vsv", "vsh", rename variable "vs" to "v".

20. S362ANI+M_vsv.nc
    Paper : [Moulik and Ekstrom] https://doi.org/10.1093/gji/ggu356
    Download link: http://ds.iris.edu/spud/earthmodel/10131294 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vsh", rename variable "vsv" to "v".

21. S362ANI+M_vsh.nc
    Paper : [Moulik and Ekstrom] https://doi.org/10.1093/gji/ggu356
    Download link: http://ds.iris.edu/spud/earthmodel/10131294 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vsv", rename variable "vsh" to "v".

22. S362WMANI_vs.nc
    Paper : [Kustowski et al., 2008] https://doi.org/10.1029/2007JB005169
    Download link: http://ds.iris.edu/spud/earthmodel/10131240 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vsv", "vsh", rename variable "vs" to "v".

23. S362WMANI_vsv.nc
    Paper : [Kustowski et al., 2008] https://doi.org/10.1029/2007JB005169
    Download link: http://ds.iris.edu/spud/earthmodel/10131240 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vsh", rename variable "vsv" to "v".

24. S362WMANI_vsh.nc
    Paper : [Kustowski et al., 2008] https://doi.org/10.1029/2007JB005169
    Download link: http://ds.iris.edu/spud/earthmodel/10131240 (the netCDF binary for the above model expressed in km/s)
    Changes : lose variables "vs", "vsv", rename variable "vsh" to "v".

25. HMSL-S06_dvs.nc
    Paper : [Houser et al., 2008] https://doi.org/10.1111/j.1365-246X.2008.03763.x
    Download link: http://ds.iris.edu/spud/earthmodel/10131133 (The netCDF binary of the model)
    Changes : rename variable "dvs" to "v".

26. HMSL-S06_vs.nc
    Paper : [Houser et al., 2008] https://doi.org/10.1111/j.1365-246X.2008.03763.x
    Download link: http://ds.iris.edu/spud/earthmodel/10131133 (The netCDF binary of the model)
    Changes : convert dvs into vs using ak135 reference model. However, this doesn't have much meaning. In the model's online discription "While ak135 is the 1D model used for ray tracing in the inversion, the travel time measurements for each phase have the mean removed, so the 3D model is not built with respect to any particular 1D model.", therefore use with care, in this nc file, "v" represents "vs", see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_HMSL-S06_vs.cpp

27. HMSL-P06_dvp.nc
    Paper : [Houser et al., 2008] https://doi.org/10.1111/j.1365-246X.2008.03763.x
    Download link: http://ds.iris.edu/spud/earthmodel/10131126 (The netCDF binary of the model)
    Changes : rename variable "dvp" to "v".

28. HMSL-P06_vp.nc
    Paper : [Houser et al., 2008] https://doi.org/10.1111/j.1365-246X.2008.03763.x
    Download link: http://ds.iris.edu/spud/earthmodel/10131126 (The netCDF binary of the model)
    Changes : convert dvp into vp using ak135 reference model. However, this doesn't have much meaning. In the model's online discription "While ak135 is the 1D model used for ray tracing in the inversion, the travel time measurements for each phase have the mean removed, so the 3D model is not built with respect to any particular 1D model.", therefore use with care, in this nc file, "v" represents "vp", see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_HMSL-P06_vp.cpp

29. LLNL-G3Dv3_vp.nc
    Paper : [Simmons et al., 2012] https://doi.org/10.1029/2012JB009525
    Download link: http://ds.iris.edu/spud/earthmodel/10131310 (Complete model package contains LLNL_G3Dv3_README.pdf file detailing the contents. Velocity values are expressed as absolute velocity and percentage variations relative to the layer average)
    Changes : Use the depth (column 3) in "LLNL_G3Dv3.LayerAverages.txt", latitude ranging from -90 to 90, longitude ranging from -180 to 180, values (column 2) in "LLNL_G3Dv3.Interpolated.Layer??_*km.txt" to creat the vp grid. This ignore a lot details. Use with care. in this nc file, "v" represents "vp". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_LLNL-G3Dv3_vp.cpp

30. LLNL-G3Dv3_dvp.nc
    Paper : [Simmons et al., 2012] https://doi.org/10.1029/2012JB009525
    Download link: http://ds.iris.edu/spud/earthmodel/10131310 (Complete model package contains LLNL_G3Dv3_README.pdf file detailing the contents. Velocity values are expressed as absolute velocity and percentage variations relative to the layer average)
    Changes : Use the depth (column 3) in "LLNL_G3Dv3.LayerAverages.txt", latitude ranging from -90 to 90, longitude ranging from -180 to 180, values (column 3) in "LLNL_G3Dv3.Interpolated.Layer??_*km.txt" to creat the dvp grid. This ignore a lot details. Use with care. in this nc file, "v" represents "dvp". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_LLNL-G3Dv3_dvp.cpp

31. TX2000_dvs.nc
    Paper : [Davies et al., 2002] https://doi.org/10.1098/rsta.2002.1077
    Download link: http://ds.iris.edu/spud/earthmodel/10131209 (Model on a 4°x4° grid for depths from 60 to 2800 km at non-uniform intervals in netCDF format.)
    Changes : rename variable "dvs" to "v". The desicription in the dvs reads "(% deviation from layer mean)".

32. TX2011_dvs.nc
    Paper : [Davies et al., 2002] https://doi.org/10.1098/rsta.2002.1077
    Download link: http://ds.iris.edu/spud/earthmodel/10131216 (Model on a 2°x2° grid for depths from 0 to 2890 km in netCDF format)
    Changes : rename variable "dvs" to "v".

33. TX2011_vs.nc
    Paper : [Davies et al., 2002] https://doi.org/10.1098/rsta.2002.1077
    Download link: http://ds.iris.edu/spud/earthmodel/10131216 (Model on a 2°x2° grid for depths from 0 to 2890 km in netCDF format)
    Changes : convert dvs into vs using TX2011_ref downloaded from http://ds.iris.edu/files/products/emc/data/TX2011/TX2011_ref. in this nc file, "v" represents "vs". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_TX2011_vs.cpp

34. SEMUCB-WM1_dvs.nc
    Paper : [French and Romanowicz, 2014] https://doi.org/10.1093/gji/ggu334
    Download link: http://www.seismo.berkeley.edu/~barbara/REPRINTS/UCB_a3d_dist.SEMUCB-WM1.r20151019.tar.gz
    Changes : Use the program provided in the tar file, a 10km depth interval (from 60km to 2890km to avoid "nan"), 1 deg x 1 deg grid is created for dvs. This dvs is "the relative Voigt-average shear velocity perturbation relative to the reference 1D model data/model.ref". in this nc file, "v" represents "dvs". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_SEMUCB-WM1_dvs.cpp

35. SEMUCB-WM1_vsh.nc
    Paper : [French and Romanowicz, 2014] https://doi.org/10.1093/gji/ggu334
    Download link: http://www.seismo.berkeley.edu/~barbara/REPRINTS/UCB_a3d_dist.SEMUCB-WM1.r20151019.tar.gz
    Changes : Use the program provided in the tar file, a 10km depth interval (from 60km to 2890km to avoid "nan"), 1 deg x 1 deg grid is created for vsh. in this nc file, "v" represents "vsh". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_SEMUCB-WM1_vsh.cpp

36. SEMUCB-WM1_vsv.nc
    Paper : [French and Romanowicz, 2014] https://doi.org/10.1093/gji/ggu334
    Download link: http://www.seismo.berkeley.edu/~barbara/REPRINTS/UCB_a3d_dist.SEMUCB-WM1.r20151019.tar.gz
    Changes : Use the program provided in the tar file, a 10km depth interval (from 60km to 2890km to avoid "nan"), 1 deg x 1 deg grid is created for vsv. in this nc file, "v" represents "vsv". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_SEMUCB-WM1_vsv.cpp

37. SEMUCB-WM1_vs.nc
    Paper : [French and Romanowicz, 2014] https://doi.org/10.1093/gji/ggu334
    Download link: http://www.seismo.berkeley.edu/~barbara/REPRINTS/UCB_a3d_dist.SEMUCB-WM1.r20151019.tar.gz
    Changes : This vs is the Voigt-average shear velocity (sqrt((vsh^2+2vsv^2)/3)) in the same grid. in this nc file, "v" represents "vs". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_SEMUCB-WM1_vs.cpp

38. S20RTS_dvs.nc
    Paper : [Ritsema et al., 1999] https://doi.org/10.1126/science.286.5446.1925
    Download link: https://jritsema.earth.lsa.umich.edu/S20RTS_plotting.tar.gz
    Changes : Because S40RTS has PREM as reference 1D model, I assume S20RTS is also using PREM as 1D reference model. Use the program provided in the tar fille, a 10km depth interval (24.4km, 25km to 2885km, 2891km), 1 deg x 1 deg grid is created for dvs. in this nc file, "v" represents "dvs". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_S20RTS_dvs.cpp

39. S40RTS_dvs.nc
    P9per : [Ritsema et al., 2011] https://doi.org/10.1111/j.1365-246X.2010.04884.x
    Download link: https://jritsema.earth.lsa.umich.edu/S20RTS_plotting.tar.gz
    Changes : In paper it reads "... S40RTS is a model of 3‐D perturbations of isotropic shear velocity with respect to the PREM model...". The reference 1D model is PREM. Use the program provided in the tar fille, a 10km depth interval (24.4km, 25km to 2885km, 2891km), 1 deg x 1 deg grid is created for dvs. in this nc file, "v" represents "dvs". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_S40RTS_dvs.cpp

40. SP12RTS_dvs.nc
    Paper : [Koelemeijer et al., 2015] https://doi.org/10.1093/gji/ggv481
    Download link: https://www.earth.ox.ac.uk/~univ4152/downloads_sp12rts.html ("SP12RTS_plotting.tar.gz")
    Changes : In "SP12RTS.1x1.zip" it reads "... in % from anisotropic PREM ...". The reference 1D model should be PREM. Grid depths are taken from "SP12RTS.1x1.zip", 1 deg x 1 deg. in this nc file, "v" represents "dvs". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_SP12RTS_dvs.cpp

41. SP12RTS_dvp.nc
    Paper : [Koelemeijer et al., 2015] https://doi.org/10.1093/gji/ggv481
    Download link: https://www.earth.ox.ac.uk/~univ4152/downloads_sp12rts.html ("SP12RTS_plotting.tar.gz")
    Changes : In "SP12RTS.1x1.zip" it reads "... in % from anisotropic PREM ...". The reference 1D model should be PREM. Grid depths are taken from "SP12RTS.1x1.zip", 1 deg x 1 deg. in this nc file, "v" represents "dvp". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_SP12RTS_dvp.cpp

42. SEISGLOB2_dvs.nc
    Paper : [Durand et al., 2017] https://doi.org/10.1093/gji/ggx405
    Download link: http://ds.iris.edu/spud/earthmodel/16588566 (The netCDF binary for the above model expressed as shear velocity (%))
    Changes : rename "dvs" to "v". Reference model is PREM.

43. SGLOBE-rani_dvs.nc
    Paper : [Chang et al., 2015] https://doi.org/10.1002/2014JB011824
    Download link: http://ds.iris.edu/spud/earthmodel/13619038 (netCDF binary files for the above model expressed as Voigt isotropy)
    Changes : rename "dvs" to "v". Reference model is PREM.

44. SGLOBE-rani_vsv.nc
    Paper : [Chang et al., 2015] https://doi.org/10.1002/2014JB011824
    Download link: http://ds.iris.edu/spud/earthmodel/13619038 (netCDF binary files for the above model expressed as Voigt isotropy)
    Changes : convert dvs in previous nc file to vs (Voigt isotropy) using PREM. Then use the nc file downloaded from (netCDF binary files for the above model expressed as radial anisotropy in (SH/SV)^2 dimensionless scale) to calculate the vsv. in this nc file, "v" represents "vsv". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_SGLOBE-rani_vsv_vsh.cpp

45. SGLOBE-rani_vsh.nc
    Paper : [Chang et al., 2015] https://doi.org/10.1002/2014JB011824
    Download link: http://ds.iris.edu/spud/earthmodel/13619038 (netCDF binary files for the above model expressed as Voigt isotropy)
    Changes : convert dvs in previous nc file to vs (Voigt isotropy) using PREM. Then use the nc file downloaded from (netCDF binary files for the above model expressed as radial anisotropy in (SH/SV)^2 dimensionless scale) to calculate the vsh. in this nc file, "v" represents "vsh". see https://github.com/shuleyu/seismic-tomography-models/blob/master/Processing/Create_SGLOBE-rani_vsv_vsh.cpp

46. SPani_dvp.nc
    Paper : [Tesoniero et al., 2015] https://doi.org/10.1002/2015JB012026
    Download link: http://ds.iris.edu/spud/earthmodel/10162642 (the netCDF binary for the above model)
    Changes : lose variables "dlnvs", "vp", "vs", "xi", "phi", rename variable "dlnvp" to "v". Relative to PREM.

47. SPani_dvs.nc
    Paper : [Tesoniero et al., 2015] https://doi.org/10.1002/2015JB012026
    Download link: http://ds.iris.edu/spud/earthmodel/10162642 (the netCDF binary for the above model)
    Changes : lose variables "dlnvp", "vp", "vs", "xi", "phi", rename variable "dlnvs" to "v". Relative to PREM.

48. SPani_vp.nc
    Paper : [Tesoniero et al., 2015] https://doi.org/10.1002/2015JB012026
    Download link: http://ds.iris.edu/spud/earthmodel/10162642 (the netCDF binary for the above model)
    Changes : lose variables "dlnvp", "dlnvs", "vs", "xi", "phi", rename variable "vp" to "v". vp=(vpv^2+4vph^2)/5.

49. SPani_vs.nc
    Paper : [Tesoniero et al., 2015] https://doi.org/10.1002/2015JB012026
    Download link: http://ds.iris.edu/spud/earthmodel/10162642 (the netCDF binary for the above model)
    Changes : lose variables "dlnvp", "dlnvs", "vp", "xi", "phi", rename variable "vs" to "v". vs=(vph^2+2vpv^2)/3;

50. SPani_xi.nc
    Paper : [Tesoniero et al., 2015] https://doi.org/10.1002/2015JB012026
    Download link: http://ds.iris.edu/spud/earthmodel/10162642 (the netCDF binary for the above model)
    Changes : lose variables "dlnvp", "dlnvs", "vp", "vs", "phi", rename variable "xi" to "v". In paper it reads xi = (vsh^2/vsv^2). In this nc file, the comment reads xi=(vsv^2/vsh^2), which could be a typo.

51. SPani_phi.nc
    Paper : [Tesoniero et al., 2015] https://doi.org/10.1002/2015JB012026
    Download link: http://ds.iris.edu/spud/earthmodel/10162642 (the netCDF binary for the above model)
    Changes : lose variables "dlnvp", "dlnvs", "vp", "vs", "xi", rename variable "phi" to "v". In paper it reads phi = (vpv^2/vph^2).

52. GAP_P4_dvp.nc
    Paper : [Obayashi et al., 2013] https://doi.org/10.1002/2013GL057401 [Fukao and Obayashi, 2013] https://doi.org/10.1002/2013JB010466
    Download link: http://www.godac.jamstec.go.jp/catalog/data_catalog/metadataDisp/GAP_P4?lang=en
    Changes : create .nc file with Python 3 script. take midpoint of depth layers in source README as depths for each layer rather than layer boundaries. In this file, "v" refers to "dvp".

53. OJP_P_dvp.nc
    Paper : [Obayashi et al., 2021] https://doi.org/10.1038/s41598-021-99833-5
    Download link: Personal communication
    Changes : create .nc file with Python 3 script. take midpoint of depth layers in source README as depths for each layer rather than layer boundaries. In this file, "v" refers to "dvp".

54. TX2019slab_dvp.nc
    Paper : [Lu et al., 2019] https://doi.org/10.1029/2019JB017448
    Download link: https://ds.iris.edu/ds/products/emc-tx2019slab
    Changes : separated dvp and dvs and converted to a -180 to 180 format for consistency. Rename variable from "dvp" to "v".

55. TX2019slab_dvs.nc
    Paper : [Lu et al., 2019] https://doi.org/10.1029/2019JB017448
    Download link: https://ds.iris.edu/ds/products/emc-tx2019slab
    Changes : separated dvp and dvs and converted to a -180 to 180 format for consistency. Rename variable from "dvs" to "v".