Stress and fluid transfer in a fault zone due to overpressures in the seismogenic crust - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2007

Stress and fluid transfer in a fault zone due to overpressures in the seismogenic crust

Y. Guglielmi
  • Function : Author
J. Virieux
  • Function : Author

Abstract

Stress and fluid transfers were analyzed on the surface of a 30 m thick dextral strike-slip fault zone subjected to an overpressure of 63 kPa. Pressure-strain measurements taken during the pressurization indicated a strain state primarily controlled by the hydromechanical behavior of permeable fractures, and then, by the fluid diffusion in the matrix. Using THM modeling, we simulated an extension of these hydromechanical effects to a 25 km depth in the seismogenic crust, applying a lithostatic pressure at the base of the fault. The simulations indicate that a significant strain in the damage zone greater than that in the protolith, along with the differences in hydraulic diffusivity between the damage zone and protolith, may induce high static stress and fluid accumulations in the core. Under this stress, this core is projected to exhibit deformity—as much as a 12 m shear slip distributed over a 175 m long active zone.
Fichier principal
Vignette du fichier
2006GL028980.pdf (184.21 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

insu-00355205 , version 1 (03-06-2021)

Licence

Copyright

Identifiers

Cite

F. Cappa, Y. Guglielmi, J. Virieux. Stress and fluid transfer in a fault zone due to overpressures in the seismogenic crust. Geophysical Research Letters, 2007, 34, pp.L05301. ⟨10.1029/2006GL028980⟩. ⟨insu-00355205⟩
47 View
26 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More