Summary
Whole-mantle Voigt-averaged isotropic shear-wave velocity (Vs) and radially anisotropic (xi) structure for the central and southern Atlantic Ocean (latitude: 58 °S-36 °N and longitude: 83°W-43°E) from full waveform tomography using the spectral element method (SEM) for forward modeling.
Quicklinks
Description
| Name | SEMATL_23 |
| Title | Whole mantle model of the central and southern Atlantic Ocean |
| Type | 3D tomography Earth model |
| Units | Isotropic Vs and Radially anisotropic Xi |
| Year | 2024 |
| Data Revision | r0.0 (revision history) |
| Short Description | Whole-mantle Voigt-averaged isotropic shear-wave velocity (Vs) and radially anisotropic (xi) structure for the central and southern Atlantic Ocean (latitude: 58 °S-36 °N and longitude: 83°W-43°E) from full waveform tomography using the spectral element method (SEM) for forward modeling (Munch et al., 2024). Outside the target area, velocity variations reported here correspond to the (initial) model SEMUCB_WM1 (French & Romanowicz 2014). CAUTION: this representation of the model is NOT appropriate for SEM computations. For that purpose, please contact the authors, as the associated 3D crustal model needs to be implemented accurately. |
| Usage Notes | This version of the model is only for visualization 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: | F. D. Munch, Institute of Geophysics, ETH Zurich, Zurich, Switzerland & Berkeley Seismological Laboratory, McCone Hall, University of California, Berkeley, United States B.A. Romanowicz, Berkeley Seismological Laboratory, McCone Hall, University of California, Berkeley, United States S. Mukhopadhyay, School of Earth and Space exploration, Arizona State University, United States M. L. Rudolph, Department of Earth and Planetary Sciences,University of California, Davis, United States |
| Reference Model | |
| Prior Model | SEMUCB_WM1 |
| Model Download | For visualization purposes only: SEMATL23-vs.r0.0.nc (see metadata) is the Voigt-average isotropic shear wave velocity, Vs, model in netCDF 3 Classic format. SEMATL23-xi.r0.0.nc (see metadata) is the Radially anisotropic parameter, Xi, model in netCDF 3 Classic format. |
| Model Home Page | None |
| Depth Coverage | 30 to 2891 km (above netCDF), whole Earth (original model) |
| Area | Global (-90°/90°, -180°/180°) |
| Data Set Description | The data considered in this study consists of: 1) three- component acceleration seismograms recorded at permanent and temporary broad-band seismic stations from 301 events ensuring, inasmuch as possible, uniform coverage over the central and southern Atlantic ocean; and 2) Love and Rayleigh waves group velocity maps in the period range 25 to 150 s (Shapiro & Ritzwoller, 2002). For the former, only events with moment magnitudes (Mw ) larger than 4.5 were considered to guarantee a good signal-to-noise ratio and very large events (i.e., Mw > 7.2) were avoided to prevent possible complications associated to their long source-time duration, which makes the point source assumption invalid. Moreover, in order to avoid superposition of energy from different events, we ensured that all events satisfy the following criteria: 1) no M w > 7 events reported up to 2 days before the origin time of the event (here- in-after, OTE); 2) no Mw > 6 events recorded one day before the OTE; and 3) no Mw > 5 events reported in the 6 hours prior to the OTE. Event hypocentre coordinates, moment tensor components, and origin times were taken from the “Centroid Moment Tensor catalogue”:http://www.globalcmt.org. We incrementally incorporate higher frequency data as the inversion progresses by filtering the waveforms in two frequency bands: 1) 40 and 300 s, with corner frequencies at 53 and 180 s, respectively; and 2) 30 and 300 s, with corner frequencies at 36 and 180 s, respectively. We note that both frequency bands differ from the ones used in the construction of SEMUCB_WM1 (i.e., initial model) – for which cut-off periods were set to 60-400 s and 32-300 s, respectively. See Munch et al, 2024 for further details on the data set and methods used. |
Citations and DOIs
To cite the original work behind this Earth model:
- F.D. Munch, B. Romanowicz, S. Mukhopadhyay, M.L. Rudolph, Deep mantle plumes feeding periodic alignments of asthenospheric fingers beneath the central and southern Atlantic Ocean, Proc. Natl. Acad. Sci. U.S.A. 121 (46) e2407543121, https://doi.org/10.1073/pnas.2407543121 (2024).
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.2024.semalt23.1
References
- Munch, F.D. Romanowicz, B. A., Mukhopadhyay, S. & Rudolph, M. (2024). Deep mantle plumes feeding periodic alignments of asthenospheric fingers beneath the central and southern Atlantic Ocean. Proceedings of the National Academy of Sciences (PNAS). Manuscript in press.
- 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/
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/
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
- Shapiro, N.M. and Ritzwoller, M.H., 2002. Monte-Carlo inversion for a global shear-velocity model of the crust and upper mantle. Geophysical Journal International, 151(1), pp.88-105.
Credits
- r0.0 model provided by Federico Munch, Institute of Geophysics, ETHZ Zurich, Zurich, Switzerland.
h2. Revision History
revision r0.0: uploaded November 19, 2024.
Timeline
- 2024-11-21
- r0.0 online
