Print Email Facebook Twitter Induced aseismic slip and the onset of seismicity in displaced faults Title Induced aseismic slip and the onset of seismicity in displaced faults Author Jansen, J.D. (TU Delft Civil Engineering & Geosciences) Meulenbroek, B.J. (TU Delft Mathematical Physics) Faculty Civil Engineering & Geosciences Date 2022 Abstract We address aseismic fault slip and the onset of seismicity resulting from depletion-induced or injection-induced stresses in reservoirs with pre-existing vertical or inclined faults. Building on classic results, we discuss semi-analytical modelling techniques for fault slip including dislocation theory, Cauchy-type singular integral equations and the use of Chebyshev polynomials for their solution and an eigenvalue-based stability analysis. We consider slip patch development during depletion for faults with zero, constant static and slip-weakening friction, and our results confirm earlier findings based on numerical simulation, in particular the aseismic growth of two slip patches that may subsequently merge and/or become unstable resulting in nucleation of seismic slip. New findings include improved approximate expressions for the induced seismic moment per unit strike length and a description of the effect of coupling between the slip patches which affects both forward simulation and eigenvalue computation for high values of the ratio of fault throw to reservoir height. Our implementation based on analytical inversion and semi-analytical integration with Chebyshev polynomials is more efficient and more robust than our numerical integration approach. It is not yet well suited for Monte Carlo simulation, which typically requires sub-second simulation times, but with some further development that option seems to be within reach. Moreover, our results offer a possibility for embedded fault modelling in large-scale numerical simulation tools. Subject Keywords: Chebyshev polynomialsemi-analyticalsingular integralstability To reference this document use: http://resolver.tudelft.nl/uuid:80a003c4-76d6-4bbf-83ff-063e619a64ed DOI https://doi.org/10.1017/njg.2022.9 Embargo date 2022-11-07 ISSN 0016-7746 Source Netherlands Journal of Geosciences: Geologie en Mijnbouw, 101 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 J.D. Jansen, B.J. Meulenbroek Files PDF induced_aseismic_slip_and ... faults.pdf 1.43 MB Close viewer /islandora/object/uuid:80a003c4-76d6-4bbf-83ff-063e619a64ed/datastream/OBJ/view