Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland-Reference-Cited by-同舟云学术

Complex Shear Wave Velocity Structure Imaged Beneath Africa and Iceland

Published:1999-12-03 Issue:5446 Volume:286 Page:1925-1928
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Ritsema Jeroen¹,Heijst Hendrik Jan van¹,Woodhouse John H.²

Affiliation:

1. Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA.

2. Department of Earth Sciences, Oxford University, Oxford OX1 3PR, UK.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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