Coupled normal-mode sensitivity to inner-core shear velocity and attenuation

Andrews, J. and Deuss, A. and Woodhouse, J. (2006) Coupled normal-mode sensitivity to inner-core shear velocity and attenuation. Geophysical Journal International, 167 (1). pp. 204-212. DOI 10.1111/j.1365-246X.2006.03022.x

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Official URL: http://dx.doi.org/10.1111/j.1365-246X.2006.03022.x

Abstract

We have studied the response of normal modes to perturbations in inner-core shear velocity and attenuation, using fully coupled mode synthetics. Our results indicate that (i) mode pairs nSl–n±1Sl are strongly coupled by anelasticity, (ii) this coupling causes shear velocity perturbations to strongly affect the Q values of modes through exchange of inner-core characteristics, (iii) there is no evidence for a weakly attenuating inner core in shear, and (iv) the discrepancy between attenuation models returned from normal modes and body waves is small. These results suggest that inversions for inner-core attenuation and shear velocity should be performed simultaneously and should take account of the strong cross-coupling due to attenuation.

Item Type: Article
Uncontrolled Keywords: 2006 AREP IA52 2006 P
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Geophysical Journal International
Volume: 167
Page Range: pp. 204-212
Identification Number: 10.1111/j.1365-246X.2006.03022.x
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:01
Last Modified: 23 Jul 2013 10:01
URI: http://eprints.esc.cam.ac.uk/id/eprint/108

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