Hemispherical anisotropic patterns of the Earth's inner core

Mattesinia M.; Belonoshko A.B.; Buforn E.Ramírez M.Simak S.I.Udías A.Mao H.-K.Ahujae R.

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Hemispherical anisotropic patterns of the Earth's inner core

机译：Hemispherical anisotropic patterns of the Earth's inner core

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It has been shown that the Earth's inner core has an axisymmetric anisotropic structure with seismic waves traveling ～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.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2010年第21期|9507-9512|共6页
作者
Mattesinia M.; Belonoshko A.B.; Buforn E.Ramírez M.Simak S.I.Udías A.Mao H.-K.Ahujae R.;
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作者单位

Departamento de Física de la Tierra, Astronomía Y Astrofísica I, Universidad Complutense de Madrid, E-28040 Madrid, Spain;

Department of Theoretical Physics, AlbaNova University Center, Royal Institute of Technology, SE-10691 Stockholm, Sweden;

Division of Theory and Modeling, Link?ping University, SE-581 83 Link?ping, SwedenGeophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United StatesCondensed Matter Theory Group, Physics Department, Uppsala University, Box 530, SE-75121 Uppsala, Sweden;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Elastic anisotropy; Fe-bcc/-hcp; Molecular dynamics; PKiKP/PKIKP waves;

Hemispherical anisotropic patterns of the Earth's inner core

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