A Caltech Library Service

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. doi:10.1126/science.1070698.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


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
Ni, Sidao0000-0003-2988-4850
Gurnis, Michael0000-0003-1704-597X
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
Funding AgencyGrant Number
Issue or Number:5574
Record Number:CaltechAUTHORS:20121120-125635450
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35571
Deposited By: Tony Diaz
Deposited On:21 Nov 2012 17:51
Last Modified:09 Nov 2021 23:16

Repository Staff Only: item control page