Efficacy of the post-perovskite phase as an explanation for lowermost-mantle seismic properties
Article Abstract:
The efficacy of post-perovskite phase to explain the seismic properties of the lowermost mantle through coupled ab initio and seismic modeling of perovskite and post-perovskite polymorphs of MgSiO(sub 3), performed at lowermost mantle temperatures and pressures is explored. It is showed that a post-perovskite model can explain the topography and location of the D" discontinuity, apparent differences in compressional and shear wave models and the observation of a deeper, weaker discontinuity also calculations show that the regional variations in the lower-mantle shear-wave anistropy are consistent with the proposed phase change in MgSiO(sub 3) perovskite.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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The vector alignments of asteroid spins by thermal torques
Article Abstract:
Research has been conducted on processes altering asteroid rotations. The authors suggest that asteroids' non-random orientations and spin rates can be caused by thermal torques, and that these thermal torques may be more important for asteroids' spin state change than collisions.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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