Modelling fluid induced seismicity on a nearby active fault

S Murphy, GS O'Brien, J McCloskey, CJ Bean, S Nalbant

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    18 Citations (Scopus)

    Abstract

    We present a numerical investigation of the effect that static stress perturbations due to fluid injection have on a nearby active fault where the fluid does not come in physical contact with the fault. Our modelling employs a lattice Boltzmann pore diffusion model coupled with a quasi-dynamic earthquake rupture model. As diffusivities and frictional parameters can be defined independently at individual nodes/cells this allows us to replicate complex 3-D geological media in our simulations. We demonstrate the effect an injection can have on an active nearby fault. Compared with our control catalogue (identical to the original simulation but without the injection), the injection not only altered the timing of the next earthquake sequence, it also changed its size, producing a Mw 6.7 event, the largest observed earthquake on the fault. This large event pushes the fault into a subcritical state from which it took roughly 200 yr of continuous tectonic loading for the fault to return to a critical state.
    Original languageEnglish
    Pages (from-to)1613-1624
    JournalGeophysical Journal International
    Volume194
    Issue number3
    DOIs
    Publication statusPublished - Sep 2013

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  • Cite this

    Murphy, S., O'Brien, GS., McCloskey, J., Bean, CJ., & Nalbant, S. (2013). Modelling fluid induced seismicity on a nearby active fault. Geophysical Journal International, 194(3), 1613-1624. https://doi.org/10.1093/gji/ggt174