Document Detail


Hemispherical anisotropic patterns of the Earth's inner core.
MedLine Citation:
PMID:  20457937     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
It has been shown that the Earth's inner core has an axisymmetric anisotropic structure with seismic waves traveling approximately 3% faster along polar paths than along equatorial directions. Hemispherical anisotropic patterns of the solid Earth's core are rather complex, and the commonly used hexagonal-close-packed iron phase might be insufficient to account for seismological observations. We show that the data we collected are in good agreement with the presence of two anisotropically specular east and west core hemispheres. The detected travel-time anomalies can only be disclosed by a lattice-preferred orientation of a body-centered-cubic iron aggregate, having a fraction of their [111] crystal axes parallel to the Earth's rotation axis. This is compelling evidence for the presence of a body-centered-cubic Fe phase at the top of the Earth's inner core.
Authors:
Maurizio Mattesini; Anatoly B Belonoshko; Elisa Buforn; María Ramírez; Sergei I Simak; Agustín Udías; Ho-Kwang Mao; Rajeev Ahuja
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Publication Detail:
Type:  Journal Article     Date:  2010-05-10
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  107     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-05-26     Completed Date:  2010-06-29     Revised Date:  2011-03-03    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9507-12     Citation Subset:  -    
Affiliation:
Departamento de Física de la Tierra, Astronomía y Astrofísica I, Universidad Complutense de Madrid, E-28040 Madrid, Spain. mmattesi@fis.ucm.es
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