High-Pressure Nano-seismic Events in Serpentine as a Function of Shear Stresses
Abstract
We collect acoustic emissions and map shear stresses across serpentine compressed in the laboratory up to 25 GPa. At these conditions, relevant to deep-focus earthquakes, serpentine releases acoustic energy and undergoes brittle-like failure as it transforms from crystalline to amorphous states. Maps of the local stress tensor are generated with ~ 0.7 μm transverse resolution using optically detected magnetic resonance (ODMR) spectroscopy of nitrogen vacancy centers implanted in the tips of the pressure-transmitting diamonds. Acoustic emissions are measured using four broadband displacement transducers placed orthogonally on the diamond cell, allowing us to monitor source displacements as the sample is actively deforming. Stress maps are obtained on timescales of 103 s, before and after acoustic emissions that characterize dynamic failure of the sample on timescales of 10-5s-10-3 s.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMMR22A..02S
- Keywords:
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- 3919 Equations of state;
- MINERAL PHYSICS;
- 3924 High-pressure behavior;
- MINERAL PHYSICS;
- 3939 Physical thermodynamics;
- MINERAL PHYSICS;
- 3994 Instruments and techniques;
- MINERAL PHYSICS