Shear Inelasticity Measurements in Mantle Minerals

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9526988 Getting The PI proposes experiments to measure the complex torsional modulus of olivine and periclase at high temperatures, small strain amplitudes, and seismic frequencies by subjecting a cylindrical sample to harmonic torsion. The ability to measure strain wave attenuation over large frequency and temperature ranges is important for the direct interpretation of attenuation of seismic waves in the earth for the interpretation of lateral seismic velocity variations, and to illuminate the fundamental relations between stress, microdefects and strain wave propagation. The systematic study of inelasticity in earth materials is a vital complement to the study of the elastic properties of these materials. ***