SALSA3D is a tomographic model of mantle seismic P and S-wave slownesses generated through the inversion of an extensive seismic travel-time dataset.
|Name||SAndia and LoS Alamos (SALSA3D) Version 2|
|Title||A global 3D model of compressional and shear wave slowness in the mantle|
|Type||3D tomography Earth model|
|Sub Type||P & S velocities|
|EMC Data Revision||r0.0 (revision history)|
|Short Description|| SALSA3D is a tomographic model of mantle seismic P and S-wave slownesses generated through the inversion of an extensive seismic travel-time dataset.
|Usage Notes||For visualization purposes, the model is available here in netCDF format. However, for ray-tracing and travel-time prediction purposes, the full model must be downloaded from the model homepage (see below). The full model includes variable topography of layer interfaces that cannot be accurately represented in netCDF format.|
|Authors:||Sanford Ballard, Sandia National Laboratories, New Mexico, USA
James R. Hipp, Sandia National Laboratories, New Mexico, USA
Michael L. Begnaud, Los Alamos National Laboratory, New Mexico, USA
Christopher J. Young, Sandia National Laboratories, New Mexico, USA
Andre V. Encarnacao, Sandia National Laboratories, New Mexico, USA
Eric P. Chael, Sandia National Laboratories, New Mexico, USA
W. Scott Phillips, Los Alamos National Laboratory, New Mexico, USA
Charlotte A. Rowe, Los Alamos National Laboratory, New Mexico, USA
|Reference Model||The reference P and S-wave model consists of the CRUST2.0 (Bassin et al., 2000) and NNSA Unified models (Pasyanos et al., 2004; Aprea et al., 2001) overlain on top of ak135 (Kennett et al., 1995), which acts as the mantle. The Unified model is used in the upper mantle beneath Eurasia and CRUST2.0 is used everywhere else.|
|Model Download||For visualization purposes only, the P-wave and S-wave absolute velocities can be downloaded in netCDF 3 Classic format (salsa3d-v2-viz-only.r0.0.nc, metadata). To use SALSA3D for ray tracing and travel-time prediction, go to the model home page and download the full model from there.|
|Depth Coverage||-5 to 2891 km (netCDF), whole Earth (original model)|
|Area||Global (-90°/90°, -180°/180°)|
|Data Set Description||The dataset consists of ~12 million P and Pn travel-time picks and ~1.8 million S and Sn travel-time picks from 13,000 stations and 122,000 events (Begnaud, 2005; Begnaud et al., 2015; Ballard et al., 2016).|
To cite the original work behind this Earth model:
- Ballard, S., J.R. Hipp, M.L. Begnaud, C.J. Young, A.V. Encarnacao, E.P. Chael, and W.S. Phillips. 2016. SALSA3D: A tomographic model for compressional wave slowness in the Earth’s mantle for improved travel-time prediction and travel-time prediction uncertainty, Bull Seismol Soc Am, 106, https://doi.org/10.1785/0120150271.
- Begnaud, M. L., S. Ballard, C. J. Young, J. R. Hipp, A. V. Encarnacao, M. Maceira, W. S. Phillips, E. P. Chael, and C. A. Rowe. 2015. Extending SALSA3D: Adding secondary phases to a global 3D model for improved seismic event location, Abstract presented at 2015 SSA Annual Meeting, Pasadena, CA, 21-23 April 2015.
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.2021.salsa3d.1
- Aprea, C. M., C. R. Bradley, and L. K. Steck (2001). 3-D Earth models at regional and global scales, in Proc. of the 23rd Seismic Research Review, Jackson Hole, Wyoming, 147-155.
- Bassin, C., G. Laske, and G. Masters. 2000. The current limits of resolution for surface wave tomography in North America, EOS Trans AGU, 81, F897, 2000.
- Begnaud, M. L. 2005. Using a dedicated location database to enhance the gathering of ground truth information, Los Alamos National Laboratory LA-UR-04-5992, 22 pp.
- Kennett, B.L.N., E.R. Engdahl, and R. Buland. 1995. Constraints on seismic velocities in the Earth from travel times, Geophys J Int, 122, 108-124.
- Pasyanos, M. E., W. Walter, R., M. P. Flanagan, P. Goldstein, and J. Bhattacharyya. 2004. Building and testing an a priori geophysical model for western Eurasia and North Africa, Pageoph 161, 235-281.
Sanford Ballard, James Hipp, Michael L. Begnaud, Christopher Young, Andre Encarnacao, Eric
Chael, W. Scott Phillips, Charlotte Rowe, Robert Porritt, Rigobert Tibi, Patrick Hammond,
revision r0.0: uploaded February 5, 2021.