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Dynamics of Fluid Induced Aseismic Slip

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Pierre Dublanchet

Résumé

Fluid operations at depth not only trigger earthquakes but also aseismic slip on preexisting faults. In many cases the aseismic slip activates in turn a significant amount of seismicity. Understanding the dynamics of such propagating slow slip phenomena is thus of primarily importance to better assess the induced seismicity hazard. Here we model a typical aseismic fault by a planar interface between elastic half spaces, where slip is resisted by Dieterich-Ruina friction. We present numerical results about the slow slip events generated by a local fluid injection on such a fault. We demonstrate the existence of a self similar solution for slip rate along this fault of the form $V=t^{−1}f(x/t)$. This solution allows to identify the mechanical parameters controlling the evolution of slow slip in response to a localized pressure increase.
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Dates et versions

hal-01545714 , version 1 (23-06-2017)

Identifiants

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Pierre Dublanchet, Robert C. Viesca. Dynamics of Fluid Induced Aseismic Slip. EAGE conference, European Association of Geoscientists & Engineers, Jun 2017, Paris, France. pp.1-5, ⟨10.3997/2214-4609.201700960⟩. ⟨hal-01545714⟩
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