Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland
A model of three-dimensional shear wave velocity variations in the mantle reveals a tilted low velocity anomaly extending from the core-mantle boundary (CMB) region beneath the southeastern Atlantic Ocean into the upper mantle beneath eastern Africa. This anomaly suggests that Cenozoic flood basalt...
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American Association for the Advancement of Science
1999
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Online Access: | https://doi.org/10.1126/science.286.5446.1925 |
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ftcaltechauth:oai:authors.library.caltech.edu:nfjnv-1dh03 2024-06-23T07:53:57+00:00 Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland Ritsema, Jeroen van Heijst, Hendrik-Jan Woodhouse, John H. 1999-12-03 https://doi.org/10.1126/science.286.5446.1925 unknown American Association for the Advancement of Science https://doi.org/10.1126/science.286.5446.1925 oai:authors.library.caltech.edu:nfjnv-1dh03 eprintid:52078 resolverid:CaltechAUTHORS:20141124-075055910 info:eu-repo/semantics/closedAccess Other Science, 286(5446), 1925-1928, (1999-12-03) info:eu-repo/semantics/article 1999 ftcaltechauth https://doi.org/10.1126/science.286.5446.1925 2024-06-12T02:02:50Z A model of three-dimensional shear wave velocity variations in the mantle reveals a tilted low velocity anomaly extending from the core-mantle boundary (CMB) region beneath the southeastern Atlantic Ocean into the upper mantle beneath eastern Africa. This anomaly suggests that Cenozoic flood basalt volcanism in the Afar region and active rifting beneath the East African Rift is linked to an extensive thermal anomaly at the CMB more than 45 degrees away. In contrast, a low velocity anomaly beneath Iceland is confined to the upper mantle. © 1999 American Association for the Advancement of Science. Received 23 August 1999; accepted 9 November 1999. Data were provided by the IRIS and GEOSCOPE data management centers. This research was funded by a grant from the National Science Foundation. We thank D. Anderson, Y. Fialko, and M. Gurnis for helpful discussions. This is contribution number 8687 of the Division of Geological and Planetary Sciences at California Institute of Technology. Article in Journal/Newspaper Iceland Caltech Authors (California Institute of Technology) Science 286 5446 1925 1928 |
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Caltech Authors (California Institute of Technology) |
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description |
A model of three-dimensional shear wave velocity variations in the mantle reveals a tilted low velocity anomaly extending from the core-mantle boundary (CMB) region beneath the southeastern Atlantic Ocean into the upper mantle beneath eastern Africa. This anomaly suggests that Cenozoic flood basalt volcanism in the Afar region and active rifting beneath the East African Rift is linked to an extensive thermal anomaly at the CMB more than 45 degrees away. In contrast, a low velocity anomaly beneath Iceland is confined to the upper mantle. © 1999 American Association for the Advancement of Science. Received 23 August 1999; accepted 9 November 1999. Data were provided by the IRIS and GEOSCOPE data management centers. This research was funded by a grant from the National Science Foundation. We thank D. Anderson, Y. Fialko, and M. Gurnis for helpful discussions. This is contribution number 8687 of the Division of Geological and Planetary Sciences at California Institute of Technology. |
format |
Article in Journal/Newspaper |
author |
Ritsema, Jeroen van Heijst, Hendrik-Jan Woodhouse, John H. |
spellingShingle |
Ritsema, Jeroen van Heijst, Hendrik-Jan Woodhouse, John H. Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland |
author_facet |
Ritsema, Jeroen van Heijst, Hendrik-Jan Woodhouse, John H. |
author_sort |
Ritsema, Jeroen |
title |
Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland |
title_short |
Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland |
title_full |
Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland |
title_fullStr |
Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland |
title_full_unstemmed |
Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland |
title_sort |
complex shear wave velocity structure imaged beneath africa and iceland |
publisher |
American Association for the Advancement of Science |
publishDate |
1999 |
url |
https://doi.org/10.1126/science.286.5446.1925 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Science, 286(5446), 1925-1928, (1999-12-03) |
op_relation |
https://doi.org/10.1126/science.286.5446.1925 oai:authors.library.caltech.edu:nfjnv-1dh03 eprintid:52078 resolverid:CaltechAUTHORS:20141124-075055910 |
op_rights |
info:eu-repo/semantics/closedAccess Other |
op_doi |
https://doi.org/10.1126/science.286.5446.1925 |
container_title |
Science |
container_volume |
286 |
container_issue |
5446 |
container_start_page |
1925 |
op_container_end_page |
1928 |
_version_ |
1802645859016376320 |