Normal mode splitting function measurements of anelasticity and attenuation in the Earth's inner core

Mäkinen, A. M and Deuss, A. (2013) Normal mode splitting function measurements of anelasticity and attenuation in the Earth's inner core. Geophysical Journal International, 194 (1). pp. 401-416. ISSN 0956-540X DOI 10.1093/gji/ggt092

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Official URL: http://dx.doi.org/10.1093/gji/ggt092

Abstract

We have used the iterative spectral fitting method to measure both the elastic and anelastic splitting functions of 20 inner core sensitive normal modes. These modes show significant improvement in spectral fit when anelastic splitting function coefficients dst are introduced in addition to the elastic splitting function coefficients cst. We employ two separate anelastic treatments: (i) fully anelastic measurement, in which a complete set of anelastic splitting function coefficients is measured in addition to the elastic coefficients, and (ii) zonal anelastic measurement, in which anelasticity is only allowed in zonal splitting function coefficients. Together, these two approaches confirm that normal modes sensitive to the Earth’s inner core resolve zonally dominant elastic and anelastic structures. The zonal dominance of anelasticity suggests that the inner core exhibit cylindrical attenuation anisotropy in addition to cylindrical velocity anisotropy. In particular, the zonally dominant anelasticity correlates with zonal elastic structure, that is, directions of higher velocity in the inner core also appear more attenuating.

Item Type: Article
Additional Information: This is an electronic version of an article published in Geophysical Journal International © The Authors 2013. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 2013AREP; IA66; OAgE
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Geophysical Journal International
Volume: 194
Page Range: pp. 401-416
Identification Number: 10.1093/gji/ggt092
Depositing User: Sarah Humbert
Date Deposited: 04 Sep 2013 12:06
Last Modified: 11 Jul 2014 11:42
URI: http://eprints.esc.cam.ac.uk/id/eprint/2882

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