Imperial College London
Alternate

Saskia Goes

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Geophysics
 
 
 
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Contact

 

+44 (0)20 7594 6434s.goes

 
 
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Location

 

4.47Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Civiero:2016:10.1002/2016JB013070,
author = {Civiero, C and Goes, S and Hammond, JOS and Fishwick, S and Ahmed, A and Ayele, A and Doubre, C and Goitom, B and Keir, D and Kendall, JM and Leroy, S and Ogubazghi, G and Rümpker, G and Stuart, GW},
doi = {10.1002/2016JB013070},
journal = {Journal of Geophysical Research. Solid Earth},
pages = {7395--7408},
title = {Small-scale thermal upwellings under the northern East African Rift from S travel time tomography},
url = {http://dx.doi.org/10.1002/2016JB013070},
volume = {121},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - There is a long-standing debate over how many and what types of plumes underlie the East African rift and whether they do or do not drive its extension and consequent magmatism and seismicity. Here we present a new tomographic study of relative teleseismic S and SKS residuals that expands the resolution from previous regional studies below the northern East African Rift to image structure from the surface to the base of the transition zone. The images reveal two low-velocity clusters, below Afar and west of the Main Ethiopian Rift, that extend throughout the upper mantle and comprise several smaller-scale (about 100-km diameter) low-velocity features. These structures support those of our recent P tomographic study below the region. The relative magnitude of S to P residuals is around 3.5, which is consistent with a predominantly thermal nature of the anomalies. The S- and P-velocity anomalies in the low-velocity clusters can be explained by similar excess temperatures in the range of 100-200°C, consistent with temperatures inferred from other seismic, geochemical and petrological studies. Somewhat stronger VS anomalies below Afar than west of the MER may include an expression of volatiles and/or melt in this region. These results, together with a comparison with previous larger scale tomographic models, indicate that these structures are likely small-scale upwellings with mild excess temperatures, rising from a regional thermal boundary layer at the base of the upper mantle.
AU  - Civiero,C
AU  - Goes,S
AU  - Hammond,JOS
AU  - Fishwick,S
AU  - Ahmed,A
AU  - Ayele,A
AU  - Doubre,C
AU  - Goitom,B
AU  - Keir,D
AU  - Kendall,JM
AU  - Leroy,S
AU  - Ogubazghi,G
AU  - Rümpker,G
AU  - Stuart,GW
DO  - 10.1002/2016JB013070
EP  - 7408
PY  - 2016///
SN  - 2169-9313
SP  - 7395
TI  - Small-scale thermal upwellings under the northern East African Rift from S travel time tomography
T2  - Journal of Geophysical Research. Solid Earth
UR  - http://dx.doi.org/10.1002/2016JB013070
UR  - http://hdl.handle.net/10044/1/41221
VL  - 121
ER  -
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