The extreme acoustic anisotropy and fast sound velocities of cubic high-pressure ice polymorphs at Mbar pressure Academic Article uri icon


  • We presented the experimentally determined single-crystal elasticity model of ice up to 103(3) GPa, based on the sound velocity measurements of high-P ice polymorphs within multiple diamond anvil cells using Brillouin spectroscopy. We have not observed any discontinuities of the P-wave (Vp) or S-wave (Vs) velocities over the entire P range. The elastic moduli of high-P ice show a close to linear P dependence. In comparison with the high-P silicate minerals in terrestrial planetary bodies, the Vp and Vs values of ice exceed those of both bridgmanite and ferropericlase at P<8090GPa, counter-intuitively indicating that the high-P ice, if existing in the deep terrestrial planets' interior, is not a slow phase. Instead, the high-P ice shows extremely strong elastic anisotropy, reaching 27% and 74% at 100GPa for Vp and Vs, respectively. The presence of high-P ice in terrestrial planets' interior, even on a small scale may lead to the observable anisotropic signatures, such as the 25% Vs anisotropy in the deep earthquake-generating zone in subducting slabs. We anticipate our measurements to serve as an important base for explaining and modeling the geophysical observations for various types of planetary bodies.

published proceedings


altmetric score

  • 0.5

author list (cited authors)

  • Zhang, J. S., Hao, M., Ren, Z., & Chen, B.

citation count

  • 8

complete list of authors

  • Zhang, Jin S||Hao, M||Ren, Z||Chen, B

publication date

  • May 2019