The quartz α↔β phase transition: Does it drive damage and reaction in continental crust?

Johnson, Scott E.; Song, Won Joon; Cook, Alden C.; Vel, Senthil S.; Gerbi, Christopher

doi:10.1016/j.epsl.2020.116622

Cited by 24 publications

(17 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number of grains in the microstructure is 238 and the ratio of finite elements to grains is 288. Thus, we classify our microstructure as a representative volume element in the sense that analyzing a larger area would not significantly change our results (see Appendix A of S. E. Johnson et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

Energy Partitioning, Dynamic Fragmentation, and Off‐Fault Damage in the Earthquake Source Volume

et al. 2021

Self Cite

View full text Add to dashboard Cite

During an earthquake, released elastic strain energy rel E U is converted to the energy conv E U required to advance the rupture and to overcome the frictional resistance to slip on the trailing fault (see Table 1 for notation used in this paper). The rest radiates away as elastodynamic waves rad E U that produce ground shaking. rad E U is the only quantity that can be directly measured and generally comprises less than 15%-20% of rel E U (e.g., Lachenbruch &

show abstract

Section: Discussionmentioning

confidence: 99%

Energy Partitioning, Dynamic Fragmentation, and Off‐Fault Damage in the Earthquake Source Volume

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, only a slight increase in Vp is observed at temperature beyond the transition, in disagreement with the sharp change in velocity predicted by (Abers and Hacker, 2016), and measured experimentally (Kern, 1982;Zappone and Benson, 2013), albeit at lower pressure. The causes of this discrepancy, may be due to experimental artifacts such as a strong thermal gradient in our sample or micro-cracks induced by the structural transition (Glover et al, 1995;Johnson et al, 2021), or possibly inaccurate thermodynamic databases.…”

Section: Evolution Of P-wave Velocities At the α→β Quartz Phase Transitionmentioning

confidence: 98%

A new generation Griggs apparatus with active acoustic monitoring

et al. 2021

View full text Add to dashboard Cite

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

show abstract

“…EBSD data were post‐processed with EDAX‐TSL OIM Analysis 5.31 software to produce clean EBSD maps for the purpose of numerical analysis, following the procedure suggested in Johnson, Song, Cook, et al. (2021). They were reindexed to accurately identify phases using Hough peaks and chemistry, and to eliminate minor accessory phases (<5 modal%).…”

Section: Methodsmentioning

confidence: 99%

“…EDAX-TSL OIM Data Collection 5.31 software was used to index EBSD patterns on square grids with step size of 5 and 2 μm for relatively coarse-grained QF and fine-grained schist samples, respectively. EBSD data were post-processed with EDAX-TSL OIM Analysis 5.31 software to produce clean EBSD maps for the purpose of numerical analysis, following the procedure suggested in Johnson, Song, Cook, et al (2021). They were reindexed to accurately identify phases using Hough peaks and chemistry, and to eliminate minor accessory phases (<5 modal%).…”

Section: Data Acquisition and Post-processingmentioning

confidence: 99%

“…To quantitatively determine bulk stiffness tensors and seismic wave velocities from the cleaned EBSD maps, the Euler angles, pixel coordinates and phase information were used in the TESA (Thermo-Elastic and Seismic Analysis) numerical toolbox featuring a MATLAB-based graphical user interface (Figure S1a in Supporting Information S1; Cook et al, 2018;Johnson, Song, Cook, et al, 2021;Vel et al, 2016). The TESA toolbox was developed by Cook et al (2018) to investigate seismic anisotropy of rocks, but also calculates grain-scale mechanical and thermal stresses and thermal conductivity for polyphase aggregates.…”

Section: Calculation Of Elastic and Seismic Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Elastic Contrast, Rupture Directivity, and Damage Asymmetry in an Anisotropic Bimaterial Strike‐Slip Fault at Middle Crustal Depths

Song

Johnson

et al. 2022

JGR Solid Earth

Self Cite

View full text Add to dashboard Cite

Mature faults with large cumulative slip often separate rocks with dissimilar elastic properties and show asymmetric damage distribution. Elastic contrast across such bimaterial faults can significantly modify various aspects of earthquake rupture dynamics, including normal stress variations, rupture propagation direction, distribution of ground motions, and evolution of off‐fault damage. Thus, analyzing elastic contrasts of bimaterial faults is important for understanding earthquake physics and related hazard potential. The effect of elastic contrast between isotropic materials on rupture dynamics is relatively well studied. However, most fault rocks are elastically anisotropic, and little is known about how the anisotropy affects rupture dynamics. We examine microstructures of the Sandhill Corner shear zone, which separates quartzofeldspathic rock and micaceous schist with wider and narrower damage zones, respectively. This shear zone is part of the Norumbega fault system, a Paleozoic, large‐displacement, seismogenic, strike‐slip fault system exhumed from middle crustal depths. We calculate elastic properties and seismic wave speeds of elastically anisotropic rocks from each unit having different proportions of mica grains aligned sub‐parallel to the fault. Our findings show that the horizontally polarized shear wave propagating parallel to the bimaterial fault (with fault‐normal particle motion) is the slowest owing to the fault‐normal compliance and therefore may be important in determining the elastic contrast that affects rupture dynamics in anisotropic media. Following results from subshear rupture propagation models in isotropic media, our results are consistent with ruptures preferentially propagated in the slip direction of the schist, which has the slower horizontal shear wave and larger fault‐normal compliance.

show abstract

The quartz α↔β phase transition: Does it drive damage and reaction in continental crust?

Cited by 24 publications

References 44 publications

Energy Partitioning, Dynamic Fragmentation, and Off‐Fault Damage in the Earthquake Source Volume

Energy Partitioning, Dynamic Fragmentation, and Off‐Fault Damage in the Earthquake Source Volume

A new generation Griggs apparatus with active acoustic monitoring

Elastic Contrast, Rupture Directivity, and Damage Asymmetry in an Anisotropic Bimaterial Strike‐Slip Fault at Middle Crustal Depths

Contact Info

Product

Resources

About