Earthquake Nucleation Along Faults With Heterogeneous Weakening Rate

Lebihain, Mathias; Roch, Thibault; Violay, Marie; Molinari, Jean‐François

doi:10.1029/2021gl094901

Cited by 31 publications

(32 citation statements)

References 50 publications

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“…Capturing these effects would require more complex physics and in particular more advanced friction formulations such as rate and state or mechanistic models. Also, slip is known to be governed by local fluctuations in friction properties, both at small scales (Luo & Ampuero, 2018;Lebihain et al, 2021) and at larger scales because friction properties are lithology-dependent (Hunfeld et al, 2017). More advanced friction formulations and heterogeneities in friction properties can be implemented relatively straightforward in the current formulation.…”

Section: Discussionmentioning

confidence: 99%

Induced aseismic slip and the onset of seismicity in displaced faults

Meulenbroek

2022

Netherlands Journal of Geosciences

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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.

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Section: Discussionmentioning

confidence: 99%

Induced aseismic slip and the onset of seismicity in displaced faults

Meulenbroek

2022

Netherlands Journal of Geosciences

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“…Similarly, for slip-weakening friction, we can use LSA to compute the universal nucleation length for any non-uniform loading condition [3,20,[22][23][24]. Uenishi and Rice [20] showed that starting from the equation for quasi-static elastic equilibrium (Eq.…”

Section: Stress Criterionmentioning

confidence: 99%

“…Previous numerical works on nucleation of frictional sliding have mostly focused on the yielding phase, either because residual friction is disregarded [20] or simply because it is not triggered during nucleation [23,24]. Other works that do trigger residual friction concentrate mainly on the effect of background stress and pore pressure [25][26][27][28], while some others explore the role of heterogeneity but are still limited to a single source [29][30][31] or focus exclusively on the quasi-static features of nucleation [16,32], missing out on the rich dynamics of late nucleation mechanisms triggered by the onset of fracture.…”

Section: Introductionmentioning

confidence: 99%

Nucleation of frictional slip: A yielding or a fracture process?

Castellano¹,

Flavio²,

Kammer³

2022

Preprint

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“…1c, d). The general existence of heterogeneous fault structure and pre-existing stress may lead to multiple rupture fronts nucleating simultaneously from several asperities (Lebihain et al, 2021;Dublanchet et al, 2013;Mai and Beroza, 2002;Campillo et al, 2001), complex collective slip fronts in 3D, jumps of the rupture front, and repeated acceleration and deceleration of the failure process. Source time functions of earthquakes are frequently complex, showing multiple peaks that re ect these processes.…”

Section: Field Studiesmentioning

confidence: 99%

Fracture, friction and damage processes in earthquake rupture zones

Ben‐Zion

Dresen

2022

Preprint

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We discuss properties and processes of earthquake rupture zones based on field studies, laboratory observations, theoretical models and simulations, with the goal of assessing the possible dominance of different processes in different parts of the rupture and validity of commonly used models. Rupture zones may be divided into front, intermediate, and tail regions that interact to different extents. The rupture front is dominated by fracturing and granulation processes and strong dilatation, producing faulting products that are reworked by subsequent sliding behind. The intermediate region sustains primarily frictional sliding with relatively high slip rates that produce appreciable stress transfer to the propagating front. The tail region further behind is characterized by low slip rates that effectively do not influence the propagating front, although it (and the intermediate region) can spawn small offspring rupture fronts. Earthquake ruptures are often spatially discontinuous and intermittent with a hierarchy of asperity and segment sizes that radiate waves with different tensorial composition and frequency bands. While different deformation processes dominating parts of the rupture zones can be treated effectively with existing constitutive relations, a more appropriate analysis of earthquake processes would require a model that combines aspects of fracture, damage-breakage, and frictional frameworks.

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Earthquake Nucleation Along Faults With Heterogeneous Weakening Rate

Cited by 31 publications

References 50 publications

Induced aseismic slip and the onset of seismicity in displaced faults

Induced aseismic slip and the onset of seismicity in displaced faults

Nucleation of frictional slip: A yielding or a fracture process?

Fracture, friction and damage processes in earthquake rupture zones

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