Dynamic synchrotron imaging of brittle failure in crustal rocks
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- Institutt for geofag [2342]
Sammendrag
Majority of earthquakes originate at depths of 15-20 kilometers and may propagate on to the surface resulting in catastrophes. Predicting their occurrence is an important question in Earth science. These geological phenomena have microstructural origins and can be better understood when considering the material failure properties of rocks at microscale. To investigate microscale deformation in centimetre-scale rock specimen, a special triaxial rock deformation apparatus, HADES (built in-house) is employed. Three-dimensional images of the microstructural deformation at every step increase in axial load are obtained using the technique of synchrotron X-ray micro tomography. A series of digital volumes of the rock microstructure is obtained until failure, which facilitates tracking the accumulation of damage, localization of strain and underlying microstructural mechanisms that govern failure in brittle rocks. Using a detailed analysis of microstructural evolution, this experimental study provide the first test of theoretical models of failure proposed for heterogeneous brittle rocks and identify mechanisms of strain localization and earthquake nucleation in them.Artikkelliste
Paper 1: Dynamics of microscale precursors during brittle compressive failure in Carrara marble. Neelima Kandula, Benoît Cordonnier, Elodie Boller, Jérôme Weiss, Dag Kristian Dysthe and François Renard. Journal of Geophysical Research: Solid Earth, 124(6), 6121-6139 (2019). DOI: 10.1029/2019JB017381. The article is included in the thesis. Also available at: https://doi.org/10.1029/2019JB017381 |
Paper 2: Synchrotron 4D X-ray imaging reveals strain localization at the onset of system-size failure in porous reservoir rocks. Neelima Kandula, Jessica McBeck, Benoît Cordonnier, Jérôme Weiss, Dag Kristian Dysthe and François Renard. Submitted to Pure and Applied Geophysics (2021). To be published. The paper is not available in DUO awaiting publishing. |
Paper 3: Volumetric and shear processes in crystalline rock approaching faulting. François Renard, Jessica McBeck, Neelima Kandula, Benoît Cordonnier, Paul Meakin, & Yehuda Ben-Zion. Proceedings of the National Academy of Sciences, 116(33), 16234-16239 (2019). DOI: 10.1073/pnas.1902994116. The article is included in the thesis. Also available at: https://doi.org/10.1073/pnas.1902994116 |
Paper 4: Isolating the factors that govern fracture development in rocks throughout dynamic in situ X-ray tomography experiments. Jessica McBeck, Neelima Kandula, John M. Aiken, Benoît Cordonnier, and François Renard. Geophysical Research Letters 46, no. 20: 11127-11135 (2019). DOI: 10.1029/2019GL084613. The article is included in the thesis. Also available at: https://doi.org/10.1029/2019GL084613 |