静水压力和单轴压力对后钙钛矿MgSiO<sub>3</sub>中地震波速的影响

何开华; 陈琦丽; 王清波; 王希成; 高本州; 姬广富

doi:10.3799/dqkx.2013.050

Volume 38 Issue 3

May 2013

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Article Navigation > Earth Science > 2013 > 38(3): 501-507

HE Kai-hua, CHEN Qi-li, WANG Qing-bo, WANG Xi-cheng, Gao Ben-zhou, JI Guang-fu, 2013. Effects on Seismic Velocity of Post-Perovskite MgSiO3 under Hydrostatic and Uniaxial Pressure. Earth Science, 38(3): 501-507. doi: 10.3799/dqkx.2013.050

Citation:

HE Kai-hua, CHEN Qi-li, WANG Qing-bo, WANG Xi-cheng, Gao Ben-zhou, JI Guang-fu, 2013. Effects on Seismic Velocity of Post-Perovskite MgSiO₃ under Hydrostatic and Uniaxial Pressure. Earth Science, 38(3): 501-507. doi: 10.3799/dqkx.2013.050

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Effects on Seismic Velocity of Post-Perovskite MgSiO₃ under Hydrostatic and Uniaxial Pressure

doi: 10.3799/dqkx.2013.050

1.
School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China
2.
Institute of Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China

Received Date: 2012-08-25
Publish Date: 2013-05-15

Abstract

Abstract

The elastic property and seismic velocity of Post-Perovsikt (PPv) MgSiO₃ have been studied using first-principles calculations based on density of functional theory (DFT).Firstly, the stability of PPv-MgSiO₃ under high pressure is validated through total energy calculations and the criterion of mechanical stability.The obtained lattice constants are in accordance well with the previous calculated and experimental results.The calculations indicate that the bulk modulus, shear modulus, density and seismic velocity of PPv-MgSiO₃ are larger than those of Pv-MgSiO₃, which are in agreement with seismic observations.Under hydrostatic pressure, the anisotropy of compressed wave has little change, while that of shear wave is enhanced.For the uniaxial pressure, both compressed and shear anisotropies are increased with strain along the a or c axis, while are decreased with strain along the b axis with respect to that of hydrostatic pressure.This study is useful for explaining the seismic velocity discontinuity and lateral heterogeneity in the D" layer.
- Post-Perovskite MgSiO₃,
- hydrostatic pressure,
- uniaxial pressure,
- D" layer,
- seismic velocity,
- mineral materials

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References(39)

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Effects on Seismic Velocity of Post-Perovskite MgSiO3 under Hydrostatic and Uniaxial Pressure

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Effects on Seismic Velocity of Post-Perovskite MgSiO₃ under Hydrostatic and Uniaxial Pressure