GrowYourIC: a step toward a coherent model of the earth’s inner core seismic structure

Lasbleis, Marine, Waszek, Lauren, and Day, Elizabeth A. (2017) GrowYourIC: a step toward a coherent model of the earth’s inner core seismic structure. Geochemistry, Geophysics, Geosystems, 18 (11). pp. 4016-4026.

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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 raypaths, for random or user‐specified data sets. We test kinematic models which simulate fast lateral translation, superrotation, 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 modeled by a fast translation but could be produced by slow translation associated with superrotation.

Item ID: 65368
Item Type: Article (Research - C1)
ISSN: 1525-2027
Keywords: core dynamics, inner core, seismic data, open‐access tool
Copyright Information: © 2017. American Geophysical Union.
Funders: Japan Society for the Promotion of Science (JSPS), Australian Research Council (ARC), Homerton College (HC), European Research Council (ERC)
Projects and Grants: JSPS International Research Fellowship, ARC Discovery Early Career Research Award project DE170100329, HC Junior Research Fellowship, ERC European Community’s Seventh Framework Programme (FP7/2007–2013)/ERC grant 204995.
Date Deposited: 20 Dec 2020 21:59
FoR Codes: 37 EARTH SCIENCES > 3706 Geophysics > 370609 Seismology and seismic exploration @ 33%
37 EARTH SCIENCES > 3706 Geophysics > 370604 Geodynamics @ 34%
46 INFORMATION AND COMPUTING SCIENCES > 4601 Applied computing > 460104 Applications in physical sciences @ 33%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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