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Sharp Sides to the African Superplume

Ni, Sidao and Tan, Eh and Gurnis, Michael and Helmberger, Don (2002) Sharp Sides to the African Superplume. Science, 296 (5574). pp. 1850-1852. ISSN 0036-8075. http://resolver.caltech.edu/CaltechAUTHORS:20121120-125635450

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Abstract

Beneath southern Africa is a large structure about 1200 kilometers across and extending obliquely 1500 kilometers upward from the core-mantle boundary with a shear velocity reduction of about 3%. Using a fortuitous set of SKS phases that travel along its eastern side, we show that the boundary of the anomaly appears to be sharp, with a width less than 50 kilometers, and is tilted outward from its center. Dynamic models that fit the seismic constraints have a dense chemical layer within an upwardly flowing thermal structure. The tilt suggests that the layer is dynamically unstable on geological time scales.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.1070698DOIUNSPECIFIED
http://www.sciencemag.org/content/296/5574/1850PublisherUNSPECIFIED
Additional Information:© 2002 American Association for the Advancement of Science. Received 8 February 2002; accepted 5 April 2002. Supported by NSF grants EAR-00001966 and EAR-9725808.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-00001966
NSFEAR-9725808
Record Number:CaltechAUTHORS:20121120-125635450
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121120-125635450
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35571
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Nov 2012 17:51
Last Modified:23 Aug 2016 10:21

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