HR: 0800h
AN: DI31A-0261    [Abstracts]
TI: Origin of the Low Rigidity of the Earth's Inner Core
AU: Belonoshko, A B
EM: anatoly.belonoshko@fysik.uu.se
AF: Applied Materials Physics, Department of Materials Science and Engineering, The Royal Institute of Technology, SE-100 44 Stockholm, Sweden, Stockholm, 10044, Sweden
AU: Belonoshko, A B
EM: anatoly.belonoshko@fysik.uu.se
AF: Condensed Matter Theory, AlbaNova University Center, Department of Theoretical Physics,The Royal Institute of Technology, SE-10691 Stockholm, Sweden, Stockholm, 10691, Sweden
AU: * Skorodumova, N V
EM: snv@fysik.uu.se
AF: Condensed Matter Theory Group, Department of Physics, Uppsala University, Uppsala Box 530, Sweden, Uppsala, 75121, Sweden
AU: Davis, S
EM: sergdavisgmail.com
AF: Applied Materials Physics, Department of Materials Science and Engineering, The Royal Institute of Technology, SE-100 44 Stockholm, Sweden, Stockholm, 10044, Sweden
AU: Osiptsov, A N
EM: osiptsov@imec.msu.ru
AF: Institute of Mechanics, Moscow State University, 142432 Moscow, Russia, Moscow, 142432, Russian Federation
AU: Rosengren, A
EM: roseng@kth.se
AF: Condensed Matter Theory, AlbaNova University Center, Department of Theoretical Physics,The Royal Institute of Technology, SE-10691 Stockholm, Sweden, Stockholm, 10691, Sweden
AU: Johansson, B
EM: borje.johansson@fysik.uu.se
AF: Applied Materials Physics, Department of Materials Science and Engineering, The Royal Institute of Technology, SE-100 44 Stockholm, Sweden, Stockholm, 10044, Sweden
AU: Johansson, B
EM: borje.johansson@fysik.uu.se
AF: Condensed Matter Theory Group, Department of Physics, Uppsala University, Uppsala Box 530, Sweden, Uppsala, 75121, Sweden
AU: Johansson, B
EM: borje.johansson@fysik.uu.se
AF: School of Physics and Optoelectronic Technology and College of Advanced Science and Technology, Dalian University of Technology, Dalian 116024, China, Dalian, 116024, China
AB: The solid iron Earth's inner core has a low rigidity which manifests itself in the anomalously low velocities of shear waves as compared to those in iron alloys. Normally, when estimating elastic properties of a polycrystal one calculates an average over different orientations of a single crystal. This approach does not take into account the grain boundaries and defects likely to be abundant at high temperatures relevant for the inner core conditions. We show, by molecular dynamics simulations that if defects are considered, the calculated shear modulus and shear wave velocity decrease dramatically compared to the averaged single crystal values. Thus, the low shear wave velocity in the inner core receives its explanation (Science 316, 1603 (2007)).
DE: 3909 Elasticity and anelasticity
DE: 3924 High-pressure behavior
DE: 7207 Core (1212, 1213, 8124)
SC: Study of the Earth's Deep Interior [DI]
MN: 2007 Fall Meeting