High-definition analysis of fluid-induced seismicity related to the mesoscale hydromechanical properties of a fault zone - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2008

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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Dates and versions

insu-00334472 , version 1 (07-03-2021)

Identifiers

Cite

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, 2008, 35 (6, L06306), pp.NIL_45-NIL_50. ⟨10.1029/2007GL033087⟩. ⟨insu-00334472⟩
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