Selected elastic moduli of single-crystal olivines from ultrasonic experiments to mantle pressures

Ultrasonic interferometric measurements, developed for polycrystalline samples in a multi-anvil apparatus, were extended to single-crystal samples of San Carlos olivine and forsterite. The elastic moduli, C-22 and C-55 of San Carlos olivine and C-55 of pure forsterite, were measured to about 13 gigapascals. These data on C-22 for San Carlos olivine and C-55 for forsterite are consistent with earlier measurements and extrapolations. The C-55 for San Cartes olivine increases linearly as a function of increasing pressure, unlike the earlier nonlinear behavior observed at high pressure with impulsive stimulated scattering techniques.