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Shear heating in creeping faults changes the onset of convection

Publication ,  Journal Article
Tung, R; Poulet, T; Alevizos, S; Veveakis, E; Regenauer-Lieb, K
Published in: Geophysical Journal International
January 1, 2017

The interaction between mechanical deformation of creeping faults and fluid flow in porous media has an important influence on the heat and mass transfer processes in Earth sciences. Creeping faults can act as heat sources due to the effect of shear heating and as such could be expected to alter the conditions for hydrothermal convection. In this work, we provide a finite element-based numerical framework developed to resolve the problem of heat and mass transfer in the presence of creeping faults. This framework extends the analytical approach of the linear stability analysis (LSA) frequently used to determine the bifurcation criterion for onset of convection, allowing us to study compressible cases with the option of complex geometry and/or material inhomogeneities. We demonstrate the impact of creeping faults on the onset of convection and show that shear heating-expressed through its dimensionless group the Gruntfest number Gr-has exponential influence on the critical value of the Lewis number Le (inversely proportional to the Rayleigh number Ra) required for convection: Lec ~ Lec0 eGr. In this expression, Lec0 is the critical value of Le in the absence of shear heating. This exponential scaling shows that shear heating increases the critical Lewis number and triggers hydrothermal convection at lower permeability than in situations without it. We also show that the effect of shear heating in a fault significantly alters the pattern of convection in and around the fault zone.

Duke Scholars

Published In

Geophysical Journal International

DOI

EISSN

1365-246X

ISSN

0956-540X

Publication Date

January 1, 2017

Volume

211

Issue

1

Start / End Page

270 / 283

Related Subject Headings

  • Geochemistry & Geophysics
  • 4013 Geomatic engineering
  • 3706 Geophysics
  • 3705 Geology
  • 0909 Geomatic Engineering
  • 0404 Geophysics
  • 0403 Geology
 

Citation

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Tung, R., Poulet, T., Alevizos, S., Veveakis, E., & Regenauer-Lieb, K. (2017). Shear heating in creeping faults changes the onset of convection. Geophysical Journal International, 211(1), 270–283. https://doi.org/10.1093/GJI/GGX295
Tung, R., T. Poulet, S. Alevizos, E. Veveakis, and K. Regenauer-Lieb. “Shear heating in creeping faults changes the onset of convection.” Geophysical Journal International 211, no. 1 (January 1, 2017): 270–83. https://doi.org/10.1093/GJI/GGX295.
Tung R, Poulet T, Alevizos S, Veveakis E, Regenauer-Lieb K. Shear heating in creeping faults changes the onset of convection. Geophysical Journal International. 2017 Jan 1;211(1):270–83.
Tung, R., et al. “Shear heating in creeping faults changes the onset of convection.” Geophysical Journal International, vol. 211, no. 1, Jan. 2017, pp. 270–83. Scopus, doi:10.1093/GJI/GGX295.
Tung R, Poulet T, Alevizos S, Veveakis E, Regenauer-Lieb K. Shear heating in creeping faults changes the onset of convection. Geophysical Journal International. 2017 Jan 1;211(1):270–283.
Journal cover image

Published In

Geophysical Journal International

DOI

EISSN

1365-246X

ISSN

0956-540X

Publication Date

January 1, 2017

Volume

211

Issue

1

Start / End Page

270 / 283

Related Subject Headings

  • Geochemistry & Geophysics
  • 4013 Geomatic engineering
  • 3706 Geophysics
  • 3705 Geology
  • 0909 Geomatic Engineering
  • 0404 Geophysics
  • 0403 Geology