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A narrow, mid-mantle plume below southern Africa

Sun, Daoyuan and Helmberger, Don and Gurnis, Michael (2010) A narrow, mid-mantle plume below southern Africa. Geophysical Research Letters, 37 . L09302. ISSN 0094-8276. doi:10.1029/2009GL042339.

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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.

Item Type:Article
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URLURL TypeDescription
Sun, Daoyuan0000-0003-4461-4664
Gurnis, Michael0000-0003-1704-597X
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.
Group:Seismological Laboratory
Funding AgencyGrant Number
Subject Keywords:Plume; LLSVP; multi-pathing
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Caltech Division of Geological and Planetary Science10040
Record Number:CaltechAUTHORS:20100602-164912539
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Official Citation:Sun, D., D. Helmberger, and M. Gurnis (2010), A narrow, mid-mantle plume below southern Africa, Geophys. Res. Lett., 37, L09302, doi:10.1029/2009GL042339.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18540
Deposited On:23 Jun 2010 18:01
Last Modified:08 Nov 2021 23:44

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