Summary
A 3-D shear velocity structure of mantle based on the inversion of body, surface, and higher mode waveforms, Megnin and Romanowicz (2000) . The model was derived from handpicked transverse component waveforms and is parameterized laterally in spherical harmonics up to degree 24 (Edmonds normalization) and radially in 16 unevenly spaced splines. The SAW24B16 model is expressed as the percent perturbation from PREM .
Quicklinks
Description
| Name | SAW24B16 | |
| Title | A global shear velocity structure of the mantle from body, surface and higher-mode waveforms | |
| Type | 3-D Tomography Earth Model | |
| Sub Type | S velocity | |
| Year | 2000 | |
| Short Description | The model SAW24B16 is a VSH model parameterized laterally in spherical harmonics up to degree 24 (Edmonds normalization) and radially in 16 unevenly spaced splines. Model values are percent perturbation relative to the anisotropic reference model PREM . | |
| Authors: | ||
| Charles Megnin | ||
| Berkeley Seismological Laboratory | ||
| University of California, Berkeley | ||
| Barbara Romanowicz | ||
| Berkeley Seismological Laboratory | ||
| University of California, Berkeley | ||
| Previous Model | ||
| Reference Model | PREM | |
| Model Download | ||
| SAW24B16.grid.2×2.tar.gz (~2.2 MB) – Model on a 2°x2° grid for depths from 50 to 2850 km at 100 km intervals except between 50 and 100 km and 2800 and 2850 km. Includes source code and executable for “QA1grid” to output model values. A1dgrid reads the coefficients from the model file saw24b16.A1d and outputs model values in percent perturbation from PREM on a grid (default 2°x2°). | ||
| A 2°x2° grid for depths from 50 to 2850 km at 100 km intervals except between 50 and 100 km and 2800 and 2850 km expressed as percent perturbation with respect to PREM : SAW24B16_percent.nc (see metadata ), is the netCDF file for the model |
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| A 2°x2° grid for depths from 50 to 2850 km at 100 km intervals except between 50 and 100 km and 2800 and 2850 km expressed as km/s.: SAW24B16_kmps.nc (see metadata ), is the netCDF file for the model |
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| Model Homepage | Whole mantle shear velocity model SAW24B16 http://seismo.berkeley.edu/~barbara/saw24b16.html | |
| Depth Coverage | Whole Mantle (~30 to 2890 km) | |
| Area | Global (-90°/90°, -180°/180°) | |
| Data Set Description | The model was derived with handpicked transverse component waveforms, including: | |
| 1. SH body waves (S, SS, S3, S4, ScS, ScS2, ScS3, Sdiff and corresponding depth phases: sS, etc…), down to a corner frequency of 32 sec | ||
| 2. 1st & 2nd orbit Love waves | ||
| 3. 1st & 2nd orbit higher modes | ||
| down to a corner frequency of 70 sec |
Citations and DOIs
To cite the original work behind this Earth model:
- Megnin, Charles and Barbara Romanowicz. 2000. “The shear velocity structure of the mantle from the inversion of of body, surface and higher modes waveforms.”, Geophys. J. Int. 143:709-728. https://doi.org/10.1046/j.1365-246X.2000.00298.x.
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:
Credits
Model provided by Barbara Romanowicz
Timeline
- 2011-06-24
- Online
