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High-definition analysis of fluid-induced seismicity related to the mesoscale hydromechanical properties of a fault zone

Abstract : Interactions between pore pressure, strain and seismicity were analyzed in a 30-m-thick shallow fault zone that was subjected to a small overpressure of 80 kPa to produce small changes in effective stress. Simultaneous pressure-strain and seismic measurements taken in the fractured damage zone during the pressurization indicated that seismicity is triggered along low-permeable, highly rigid, low-dip angle, mesoscale-inherited fractures where deformation is controlled by the hydromechanical behavior of the surrounding high-permeability, not-so-rigid, aseismic, sub-vertical, fault-related fractures. Using a three-dimensional distinct-element representation of the fractures network, we show that the seismicity observed is mainly due to shear-slip along inherited planes in response to the mechanical loading induced by the opening by a few microns of the surrounding subfaults.
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https://hal-insu.archives-ouvertes.fr/insu-00334472
Contributor : Pascale Talour <>
Submitted on : Monday, October 27, 2008 - 10:00:01 AM
Last modification on : Monday, October 12, 2020 - 11:10:18 AM

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Y. Guglielmi, F. Cappa, D. Amitrano. High-definition analysis of fluid-induced seismicity related to the mesoscale hydromechanical properties of a fault zone. Geophysical Research Letters, American Geophysical Union, 2008, 35 (6, L06306), pp.NIL_45-NIL_50. ⟨10.1029/2007GL033087⟩. ⟨insu-00334472⟩

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