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    Dynamic fault interaction during a fluid-injection induced earthquake: The 2017 Mw 5.5 Pohang event

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    Palgunadi_et_al_IS_BSSA_ver2_preprint.pdf
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    Type
    Preprint
    Authors
    Palgunadi, Kadek Hendrawan cc
    Gabriel, Alice-Agnes cc
    Ulrich, Thomas
    Lopéz-Comino, José Ángel
    Mai, Paul Martin cc
    KAUST Department
    Computational Earthquake Seismology (CES) Research Group
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-03-03
    Permanent link to this record
    http://hdl.handle.net/10754/662276
    
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    Abstract
    The November 15th, 2017 Mw 5.5 Pohang earthquake (South Korea) has been linked to hydraulic stimulation and fluid injections, making this the largest induced seismic event associated with an Enhanced Geothermal System (EGS). To understand its source dynamics and fault interactions, we conduct the first 3D high-resolution spontaneous dynamic rupture simulations of an induced earthquake. We account for topography, off-fault plastic deformation under depth-dependent bulk cohesion, rapid velocity weakening friction and 1D subsurface structure. A guided fault reconstruction approach that clusters spatio-temporal aftershock locations (including their uncertainties) is used to identify a main and a secondary fault plane that intersects under a shallow angle of 15°. Based on simple Mohr-Coulomb failure analysis and 180 dynamic rupture experiments in which we vary local stress loading conditions, fluid pressure, and relative fault strength, we identify preferred two fault plane scenarios that well reproduce observations. We find that the regional far-field tectonic stress regime promotes pure strike-slip faulting, while local stress conditions constrained by borehole logging generate the observed thrust faulting component. Our preferred model is characterized by overpressurized pore fluids, non-optimally oriented but dynamically weak faults and a close to critical local stress state. In our model, earthquake rupture “jumps” to the secondary fault by dynamic triggering, generating a measurable non-double couple component. Our simulations suggest that complex dynamic fault interaction may occur during fluid-injection induced earthquakes and that local stress perturbations dominate over the regional stress conditions. These findings, therefore, have important implications for seismic hazard in active geo-reservoir.
    Citation
    Palgunadi, K. H., Gabriel, A.-A., Ulrich, T., Lopéz-Comino, J. Á., & Mai, P. M. (2020). Dynamic fault interaction during a fluid-injection induced earthquake: The 2017 Mw 5.5 Pohang event. doi:10.31223/osf.io/w5b9s
    Publisher
    Center for Open Science
    DOI
    10.31223/osf.io/w5b9s
    Additional Links
    https://osf.io/w5b9s
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    • [Dataset]
      Palgunadi, K. H., Gabriel, A.-A., Ulrich, T., Lopéz-Comino, J. Á., & Mai, P. M. (2020). Dynamic fault interaction during a fluid-injection induced earthquake: The 2017 Mw 5.5 Pohang event. Zenodo. https://doi.org/10.5281/ZENODO.3930818. DOI: 10.5281/zenodo.3930818 Handle: 10754/665100
    ae974a485f413a2113503eed53cd6c53
    10.31223/osf.io/w5b9s
    Scopus Count
    Collections
    Preprints; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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