Computer Science
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990sci...250..794g&link_type=abstract
Science (ISSN 0036-8075), vol. 250, Nov. 9, 1990, p. 794-797. Research supported by the Department of Industry Technology and Co
Computer Science
52
Earth Mantle, Magnesium Compounds, Planetary Composition, Pressure Dependence, Propagation Velocity, Seismic Waves, Silicates, Elastic Waves, Seismology, Solid Phases
Scientific paper
Ultrasonic pulse interferometry is presently used to ascertain the room temperature pressure dependence of elastic-wave velocities in hot-pressed, elastically isotropic polycrystals of the modified spinel beta-phase of Mg2SiO4. Pressure derivatives of the bulk and shear moduli derived from the travel times of the compressional, P, and shear, S, waves show that the contrast in velocity between the olivine and beta phases decreased with rising pressure. These results can ultimately be used to calculate the contrast in P and S wave velocities across an olivine-beta phase transformation occurring under temperature and pressure conditions representative of a 400-km depth in the earth.
Gwanmesia Gabriel D.
Jackson Ian
Liebermann Robert C.
Rigden Sally
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