Candy wrapper for the Earth's inner core



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Mattesini, Maurizio and Belonoshko, A.B. and Tkalčić, H. and Buforn Peiró, Elisa and Udías Vallina, Agustín and Ahuja, R. (2013) Candy wrapper for the Earth's inner core. Scientific reports, 3 . ISSN 2045-2322

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Recent global expansion of seismic data motivated a number of seismological studies of the Earth’s inner core that proposed the existence of increasingly complex structure and anisotropy. In the meantime, new hypotheses of dynamic mechanisms have been put forward to interpret seismological results. Here, the nature of hemispherical dichotomy and anisotropy is re-investigated by bridging the observations of PKP(bc-df) differential travel-times with the iron bcc/hcp elastic properties computed from first-principles methods.The Candy Wrapper velocity model introduced here accounts for a dynamic picture of the inner core (i.e., the eastward drift of material), where different iron crystal shapes can be stabilized at the two hemispheres. We show that seismological data are best explained by a rather complicated, mosaic-like, structure of the inner core, where well-separated patches of different iron crystals compose the anisotropic western hemispherical region, and a conglomerate of almost indistinguishable iron phases builds-up the weakly anisotropic eastern side.

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© The authors. The work of M.M., E.B. and A.U. is partially supported by the Spanish Ministry of Science and Innovation (CGL 2010-19803-C03-01). R.A. (VR project 2012-4379) and A.B.B. (VR project 2010-3187) acknowledge financial support from the Swedish Research Council.

Uncontrolled Keywords:Travel-times; Elastic-anisotropy; Seismic velocity; AB-initio; Iron; Pressure; Constraints; Attenuation; Heterogeneity; Temperature.
Subjects:Sciences > Physics > Geophysics
Sciences > Physics > Meteorology
ID Code:29453
Deposited On:13 Apr 2015 15:16
Last Modified:13 Apr 2015 15:16

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