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Initial Measurements On The Effect Of Stress On P- And S-Wave Velocities In Olivine, Taryn Traylor
Initial Measurements On The Effect Of Stress On P- And S-Wave Velocities In Olivine, Taryn Traylor
UNLV Theses, Dissertations, Professional Papers, and Capstones
It is well known that elasticity is a key physical property in the determination of the structure and composition of the Earth and provides critical information for the interpretation of seismic data. This study investigates the stress-induced variation in elastic wave velocities, known as the acoustoelastic effect, in San Carlos olivine. A recently developed experimental ultrasonic acoustic system, the Directly Integrated Acoustic System Combined with Pressure Experiments (DIASCoPE), was used with the D-DIA multi-anvil apparatus to transmit ultrasonic sound waves and collect the reflections. We use the DIASCoPE to obtain longitudinal (P) and shear (S) elastic wave velocities from the …
Experimental Polycrystal Stress Mapping Using Raman Spectroscopy, Genevieve C. Kidman
Experimental Polycrystal Stress Mapping Using Raman Spectroscopy, Genevieve C. Kidman
UNLV Theses, Dissertations, Professional Papers, and Capstones
Stress conditions leading to rock deformation influence how a rock will ultimately deform. However, the internal distribution of stress in an elastically anisotropic rock under load, a precursor to rock deformation, is not well understood. Two models that may describe the distribution of stress in polycrystals include the Reuss bound and stress percolation. The Reuss bound, when applied to a polycrystal, describes isostress on each grain resulting in homogeneous intragranular strain and heterogeneous intergranular strain. The stress percolation model involves a network of strong contacts or force chains containing domains of high stress interwoven through areas of lower stress that …