Skip to main content
Dryad logo

Supplemental dataset from: Initial acoustoelastic measurements in olivine: Investigating the effect of stress on P- and S-wave velocities

Citation

Traylor, Taryn; Burnley, Pamela; Whitaker, Matthew (2022), Supplemental dataset from: Initial acoustoelastic measurements in olivine: Investigating the effect of stress on P- and S-wave velocities, Dryad, Dataset, https://doi.org/10.5061/dryad.98sf7m0jn

Abstract

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 sample which we compare to our known stress state in the D-DIA derived from synchrotron X-ray diffraction. We use elastic-plastic self-consistent (EPSC) numerical modeling to forward model X-ray diffraction data collected in D-DIA experiments to obtain the macroscopic stress on our sample. We can observe the relationship between the relative elastic wave velocity change (ΔV/V) and macroscopic stress to determine the acoustoelastic constants, and interpret our observations using the linearized first-order equation based on the model proposed by Hughes and Kelly (1953). This work supports the presence of the acoustoelastic effect in San Carlos olivine, which can be measured as a function of pressure and temperature. This study will aid in our understanding of the acoustoelastic effect and provide a new experimental technique to measure the stress state in elastically deformed geologic materials at high pressure conditions.

Methods

The ultrasonics-modified deformation-DIA experiments were conducted using the D-DIA multi-anvil apparatus (Durham et al., 2002) and DIASCoPE acoustic system (Whitaker et al., 2017) located at the 6-BM-B beamline at the Advanced Photon Source at Argonne National Laboratory, Chicago, Illinois. The D-DIA multi-anvil apparatus combined with a synchrotron beamline provides the ability to measure sample stress and strain using in-situ X-ray techniques during the deformation experiment. The incorporation of the DIASCoPE acoustic system into a traditional D-DIA experiment allowed for simultaneous travel time measurements when deforming. Using the sample length measurements from synchrotron X-radiographic imaging and P- and S-wave travel times from the DIASCoPE, the elastic P- and S-wave velocities were determined. We peak fit diffraction data from the compressional (ψ= 0°, 180°) and transverse detectors (ψ= 90°) using Plot85. The olivine diffraction peaks measured to obtain d-spacing values were (130), (131), (112), (122), (140), and (211). Powder diffraction data collected from the sample during deformation was then interpreted through elastic-plastic self-consistent (EPSC) modeling (Tomé & Oliver, 2002) following the strategies devised by Burnley (2015) and Burnley and Kaboli (2019) to determine the macroscopic stress on the sample.

Funding

National Science Foundation, Award: NSF-EAR13613399

National Nuclear Security Administration, Award: DE-NA0001982