Summary
NEAR-P15 and NEAR-S16 are the teleseismic travel-time body- and shear-wave velocity models of the northern East African Rift respectively.
Quicklinks
Description
| Name | NEAR-P15+NEAR-S16 |
| Title | Teleseismic travel-time body- and shear-wave velocity models of the northern East African Rift |
| Type | 3-D Tomography Earth Model |
| Sub Type | P- and S-wave velocity |
| Year | 2015, 2016 |
| Short Description | 3D P- and S-wave velocity models (respectively NEAR-P15 and NEAR-S16) of the upper mantle beneath northern East African Rift. Relative arrival-time residuals of teleseismic P, S and SKS phases are used to invert for perturbations in the mantle. The data set used includes travel-times recorded between 1995 and 2012, from 17 seismic experiments (452 regional stations).The NEAR-P15 and NEAR-S16 models are expressed as the velocity anomalies (in percentage) relative to the average regional background. Our preferred models (NEAR-P15-damp and NEARS16-damp) are moderately damped towards the surface-wave model of Fishwick (2010), which provides better resolution in the top 300 km depth. |
| Authors: | |
| Chiara Civiero, Saskia Goes, James O. S. Hammond | |
| Department of Earth Science & Engineering | |
| Imperial College London | |
| London, UK | |
| Stewart Fishwick | |
| 2Department of Geology | |
| University of Leicester | |
| Leicester, UK | |
| Abdulhakim Ahmed, Sylvie Leroy | |
| Sorbonne Universités | |
| ISTEP UPMC, UMR7193 CNRS | |
| Paris, France | |
| Atalay Ayele | |
| Authors: Addis Ababa University | |
| Addis Ababa, Ethiopia | |
| Cecile Doubre | |
| Institut de Physique du Globe de Strasbourg, UMR 7516 | |
| Université de Strasbourg/EOST Strasbourg Cedex, France | |
| Berhe Goitom, J.-Michael Kendall | |
| School of Earth Sciences, University of Bristol | |
| Bristol, UK, | |
| Derek Keir | |
| National Oceanography Centre Southampton, University of Southampton, | |
| Southampton, UK | |
| Ghebrebrhan Ogubazghi | |
| Eritrea Institute of Technology | |
| Asmara, Eritrea | |
| Georg Rümpker | |
| Goethe University Frankfurt | |
| Frankfurt, Germany | |
| Graham W. Stuart | |
| School of Earth and Environment, University of Leeds | |
| Leeds, UK | |
| Previous Model | None |
| Reference Model | None |
| Model Download | The below models are expressed as P- and S-wave velocity anomalies in percentage respectively: NEAR-P15-damp.nc (metadata ), is the netCDF file for the damped P-wave velocity model NEAR-S16-damp.nc (metadata ), is the netCDF file for the damped S-wave velocity model NEAR-P15-undamp.nc (metadata ), is the netCDF file for the undamped P-wave velocity model NEAR-S16-undamp.nc (metadata ), is the netCDF file for the undamped S-wave velocity model |
| Model Homepage | |
| Depth Coverage | Upper mantle (~70 to 700 km) |
| Area | Afar and Main Ethiopian Rift (25.5°/57° in longitude, -24.5°/28° in latitude) |
| Data Set Description | Broadband teleseismic travel-time data from around 452 seismic stations (17 seismic experiments and permanent networks operating in the time range 1995-2012) are used in this work. |
| Supplemental Information |
200 and 700 km (modified from Civiero et al., 2015 and Civiero et al., 2016 – the area is a subregion of
the domain where we focus our interpretation). Regions with less than 3 rays per node are shaded gray.
The spacing between the contours is 0.25% for NEAR-P15 and 0.50% for NEAR-S16. The two boxes
covering Afar (A) and an area west of the MER (M) in panel e. show the two main mantle upwellings.
These maps clearly illustrate the change in structure from the rift‐related and broad shallow mantle
anomalies at 200 km depth to two low‐velocity clusters that persist throughout the transition zone and
may link to deeper structure in the lower mantle.
Citations and DOIs
To cite the original work behind this Earth model:
- Civiero, C., J. O. S. Hammond, S. Goes, S. Fishwick, A. Ahmed, A. Ayele, C. Doubre, B. Goitom, D. Keir, and J. Kendall (2015), Multiple mantle upwellings in the transition zone beneath the northern East-African Rift system from relative P-wave travel-time tomography, Geochemistry, Geophysics, Geosystems, 16, 2949–2968, https://doi.org/10.1002/2015GC005948.
- Civiero, C., Goes, S., Hammond, J. O., Fishwick, S., Ahmed, A., Ayele, A., et al. (2016). Small-scale thermal upwellings under the northern East African Rift from S travel time tomography. Journal of Geophysical Research: Solid Earth, 121, 7395–7408. https://doi.org/10.1002/2016JB013070.
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 Chiara Civiero
Timeline
- 2019-11-19
- online
