Published May 4, 2010
| Published
Journal Article
Open
A narrow, mid-mantle plume below southern Africa
- Creators
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Sun, Daoyuan
- Helmberger, Don
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Gurnis, Michael
Abstract
New waveform tomographic evidence displays a narrow plume-like feature emitting from the top of the large African low-velocity structure in the lower mantle. A detailed SKS wavefield is assembled for a segment along the structure's southern edge by combining multiple events recorded by a seismic array in the Kaapvaal region of southern Africa. With a new processing technique that emphases multi-pathing, we locate a relatively jagged, sloping wall 1000 km high with low velocities near it's basal edge. Forward modeling indicates that the plume's diameter is less than 150 km and consistent with an iso-chemical, low-viscosity plume conduit.
Additional Information
© 2010 American Geophysical Union. Received 29 December 2009; accepted 29 March 2010; published 4 May 2010. The authors would like to thank the Editor Michael Wysession, Allen McNamara, and an anonymous reviewer for their comments. This work was supported by the National Science Foundation, grant MCG.00021‐1‐NSF.CSEDIFINE and contribution 10040 of the Division of Geological and Planetary Science, California Institute of Technology.Attached Files
Published - Sun2010p10119Geophys_Res_Lett.pdf
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Additional details
- Eprint ID
- 18540
- Resolver ID
- CaltechAUTHORS:20100602-164912539
- MCG.00021‐1‐NSF.CSEDIFINE
- NSF
- Created
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2010-06-23Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field
- Caltech groups
- Seismological Laboratory
- Other Numbering System Name
- Caltech Division of Geological and Planetary Science
- Other Numbering System Identifier
- 10040