Data Services Products: EMC-SEMUCB-WM1 SEMUCB-WM1 Global Model (v1, r0.1)

Summary

SEMUCB-WM1 is a global whole-mantle tomographic earth model derived from fully numerical SEM-based forward modelling.

Description

Name SEMUCB-WM1
Title SEMUCB-WM1 Global Model (v1)
Data Version v1
Data Revision r0.1 (revision history)
Type 3D tomography Earth model
Sub Type Isotropic Vs and Radially anisotropic Xi
Year 2014
 
Short Description   SEMUCB-WM1 is a global radially anisotropic shear velocity model derived from fully numerical SEM-based forward modelling. It is parametrized in terms of isotropic S velocity (Voigt average) and the anisotropic parameter, xi (Vsh2/Vsv2 ).

 
r0.1 Revision Notes The SEMUCB_WM1 expresses the perturbations to mantle VS and ξ in cubic b-splines radially and in spherical splines laterally. However, the previous SEMUCB_WM1 (r0.0) was only evaluated to limited spherical spline and b-spline nodes. This version updates the model to include appropriate number of nodes to represent the global 3D model laterally and radially.
 
Usage Notes   This version of the model is only for plotting purposes. If you wish to compute synthetic seismograms based on this model, please refer to the guidelines here, or better, if you wish to use SPECFEM_3Dglobe, please ask us (barbarar@berkeley.edu) for the corresponding subroutines, as proper meshing is important, especially for the crust. We are in the process of incorporating these subroutines in the standard distribution of SPECFEM_3Dglobe.
 
Authors: S. W. French, Berkeley Seismological Laboratory, McCone Hall, University of California, Berkeley
B.A.Romanowicz, Berkeley Seismological Laboratory, McCone Hall, University of California, Berkeley
 
Previous Model
Reference Model
 
Model Download For visualization purposes only:
Voigt-average isotropic shear wave velocity, Vs, model can be downloaded in netCDF 3 Classic format (semucb-2014-ucb-vs-viz-only.r0.1.nc, metadata).

Radially anisotropic parameter, Xi (V_SH2/V_SV2), model can be downloaded in netCDF 3 Classic format (semucb-2014-ucb-xi-viz-only.r0.1.nc, metadata).
Details about the model can be seen here as well as versions of the model appropriate for waveform simulations.

Model Homepage http://seismo.berkeley.edu/wiki_br/Broad_plumes_rooted_at_the_base_of_the_mantle_beneath_major_hotspots
 
Depth Coverage 30 to 2891 km (netCDF), whole Earth (original model)
 
Area Global (-90°/90°, -180°/180°)
 
Data Set Description See French and Romanowicz, 2014 for details on the data set used.
 
 

SEMUCB Vs at 70 km
SEMUCB Vs at 70 km – Map views of global VS variations at 70 km depth throughout the mantle for the SEMUCB-WM1. Variations are plotted in percent with respect to the global mean.

Map views of global Xi
Map views of global Xi variations at 250 km depth throughout the mantle for the SEMUCB-WM1. Variations are plotted in per cent with respect to the global mean.

Citations and DOIs

To cite the original work behind this Earth model:

  • French, S., & Romanowicz, B. A. (2014). Whole-mantle radially anisotropic shear velocity structure from spectral-element waveform tomography. Geophysical Journal International, 199(3), 1303–1327. https://doi.org/https://doi.org/10.1093/gji/ggu334

To cite IRIS DMC Data Products effort:

  • Trabant, C., A. R. Hutko, M. Bahavar, R. Karstens, T. Ahern, and R. Aster (2012), Data Products at the IRIS DMC: Stepping Stones for Research and Other Applications, Seismological Research Letters, 83(5), 846–854, https://doi.org/10.1785/0220120032.

DOI for this EMC webpage: https://doi.org/10.17611/dp/emc.2023.semucbwm1.1

References

If you use this model, please check out the following related papers:

  • French, S. W. and B. Romanowicz (2015) Broad plumes Rooted At The Base Of The Earth’s Mantle Beneath Major Hotspots, Nature, 525, 95-99. https://doi.org/10.1038/nature14876
  • French, S. W., Y. Zheng, B. Romanowicz and K. Yelick (2015) Parallel Hessian assembly for Seismic Waveform inversion using Global updates, Proceedings of the 29th IEEE International Parallel and Distributed Processing Symposium (2015) https://doi.org/10.1109/IPDPS.2015.58.
  • French, S.W., V. Lekic, and B. Romanowicz (2013), Waveform Tomography Reveals Channeled Flow at the Base of the Oceanic Asthenosphere, Science, 342, 227- 230

Credits

Utpal Kumar, Berkeley Seismological Lab, University of California, Berkeley

Revision History

revision r0.0: uploaded January 24, 2023.
revision r0.1: uploaded July 17, 2023.

Timeline

2023-01-24
r0.0
2023-07-17
r0.1

Contact

Categories

02:35:00 v.22510d55