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GrowYourIC: a step towards a coherent model of the Earth's inner core seismic structure

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Title: GrowYourIC: a step towards a coherent model of the Earth's inner core seismic structure
Authors: Lableis, M
Waszek, L
Day, E
Item Type: Journal Article
Abstract: A complex inner core structure has been well-established from seismic studies, showing radial and lateral heterogeneities at various length scales. Yet, no geodynamic model is able to explain all the features observed. One of the main limits for this is the lack of tools to compare seismic observations and numerical models successfully. We use here a new Python tool called GrowYourIC to compare models of inner core structure. We calculate properties of geodynamic models of the inner core along seismic ray paths, for random or user-specified datasets. We test kinematic models which simulate fast lateral translation, super-rotation, and differential growth. We explore first the influence on a real inner core data set, which has a sparse coverage of the inner core boundary. Such a data set is however able to successfully constrain the hemispherical boundaries due to a good sampling of latitudes. Combining translation and rotation could explain some of the features of the boundaries separating the inner core hemispheres. The depth shift of the boundaries, observed by some authors, seems unlikely to be modelled by a fast translation, but could be produced by slow translation associated to super-rotation.
Issue Date: 20-Oct-2017
Date of Acceptance: 13-Oct-2017
URI: http://hdl.handle.net/10044/1/52079
DOI: https://dx.doi.org/10.1002/2017GC007149
ISSN: 1525-2027
Publisher: American Geophysical Union
Start Page: 4016
End Page: 4026
Journal / Book Title: Geochemistry, Geophysics, Geosystems
Volume: 18
Issue: 11
Copyright Statement: © 2017. American Geophysical Union. All Rights Reserved.
Keywords: 04 Earth Sciences
02 Physical Sciences
Geochemistry & Geophysics
Publication Status: Published online
Appears in Collections:Earth Science and Engineering
Faculty of Engineering