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Elastic constants and anisotropy of forsterite at high pressure

da Silva, C; Stixrude, L; Wentzcovitch, RM; (1997) Elastic constants and anisotropy of forsterite at high pressure. Geophysical Research Letters , 24 (15) 1963 - 1966. 10.1029/97GL01756. Green open access

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Abstract

We have determined from first principles the athermal elastic constant tensor of Mg2SiO4 forsterite with the plane wave pseudopotential method over a wide range of pressure (0-100 GPa) that encompasses the full range over which forsterite has been observed experimentally. The computed elastic constants are in excellent agreement with experimental data up to the maximum pressure of the experiments (16 GPa). We calculate the single-crystal elastic anisotropy from the elastic constants. We find that the anisotropy is strong (azimuthal P- and S-wave anisotropy: 25 % and 20 %, respectively, polarization anisotropy: 15 %), in agreement with experiment, and that it depends weakly on pressure over the range 0-25 GPa, in contrast to the behavior of other silicates and oxides.

Type: Article
Title: Elastic constants and anisotropy of forsterite at high pressure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/97GL01756
Publisher version: http://dx.doi.org/10.1029/97GL01756
Language: English
Additional information: Copyright 1997 by the American Geophysical Union
Keywords: Upper-mantle, Molecular-dynamics, California, Beneath, MgSiO3, Gulf, GPa
UCL classification: UCL
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UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/112634
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