Changes in Seismic Anisotropy Shed Light on the Nature of the Gutenberg Discontinuity-Reference-Cited by-同舟云学术

Changes in Seismic Anisotropy Shed Light on the Nature of the Gutenberg Discontinuity

Published:2014-03-14 Issue:6176 Volume:343 Page:1237-1240
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Beghein Caroline¹,Yuan Kaiqing¹,Schmerr Nicholas²,Xing Zheng¹

Affiliation:

1. Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, CA 90095–1567, USA.

2. Department of Geology, University of Maryland, College Park, MD 20742, USA.

Abstract

G Below Sea Rheological differences between Earth's lithosphere and asthenosphere help drive plate tectonics. Geophysical analyses repeatedly reveal a seismic Gutenberg (G) discontinuity at 40- to 100-kilometer depth in oceanic plates, although the origin of this boundary remains enigmatic. Beghein et al. (p. 1237 , published online 27 February) found that vertical stratification of anisotropy aligned with the depths of the G discontinuity, but not with the lithosphere-asthenosphere boundary. It appears that the G discontinuity forms when there are geophysical changes in the mantle, such as dehydration beneath mid-ocean ridges.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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