Statistics of slipping event sizes in granular seismic fault models

Ciamarra, Massimo Pica; Lippiello, Eugenio; Arcangelis, L. de; Godano, C.

doi:10.1209/0295-5075/95/54002

Cited by 21 publications

(29 citation statements)

References 44 publications

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“…Driven granular media exhibit a variety of dynamical behaviors depending on the loading mechanism and properties of the granular material, such as interparticle friction and packing fraction [1]. It is common for continuous forcing of the driver to result in periodic fluctuations in velocity [2], periodic stick-slip behavior [3][4][5][6], irregular stick-slip behavior that has been described in some cases as critical [2,7], or mode-switching between periodic and aperiodic regimes [5]. These phenomena have been observed in experiments and corresponding simulations in which the driving mechanism spans the system, as in boundary shear [5,6,8], or is significantly larger than a single grain, as in the cases of sliders pulled across the surface [2,6,9] or rods inserted into the bulk [4,10]).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a grain-scale intruder in a two-dimensional granular medium with and without basal friction

et al. 2019

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We report on a series of experiments in which a grain-sized intruder is pulled by a spring through a 2D granular material comprised of photoelastic disks in a Couette geometry. We study the intruder dynamics as a function of packing fraction for two types of supporting substrates: a frictional glass plate and a layer of water for which basal friction forces are negligible. We observe two dynamical regimes: intermittent flow, in which the intruder moves freely most of the time but occasionally gets stuck, and stick-slip dynamics, in which the intruder advances via a sequence of distinct, rapid events. When basal friction is present, we observe a smooth crossover between the two regimes as a function of packing fraction, and we find that reducing the interparticle friction coefficient causes the stick-slip regime to shift to higher packing fractions. When basal friction is eliminated, we observe intermittent flow at all accessible packing fractions. For all cases, we present results for the statistics of stick events, the intruder velocity, and the force exerted on the intruder by the grains. Our results indicate the qualitative importance of basal friction at high packing fractions and suggest a possible connection between intruder dynamics in a static material and clogging dynamics in granular flows.

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Section: Introductionmentioning

confidence: 99%

Dynamics of a grain-scale intruder in a two-dimensional granular medium with and without basal friction

et al. 2019

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“…Our results show that the additional background dissipation (especially dynamic friction) provided by the supporting substrate is essential for observing a clear stick-slip dynamics in the case of single-grain perturbations. However, stick-slip is observed without the presence of a frictional substrate if a driving force is applied over a length scale that is much larger than the characteristic particle size [3][4][5][6][7]. One open question is whether an additional background dissipation in the case of larger perturbations can alter the dynamics.…”

Section: Discussionmentioning

confidence: 99%

“…Granular media respond in a variety of ways to applied loads, such as boundary shear [1][2][3], intruding rods [4,5], or surface sliders [3,6,7], exhibiting behaviors that include fluid-like flow, solid-like rigidity, and (sometimes periodic) cycles of stability and failure [8]. The response of a granular medium to a point-load, or single-grain perturbation, is a particularly sensitive probe of the connection between grain-scale dynamics and large-scale material stability and failure.…”

Section: Introductionmentioning

confidence: 99%

Intruder in a two-dimensional granular system: Effects of dynamic and static basal friction on stick-slip and clogging dynamics

et al. 2020

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We discuss the results of simulations of an intruder pulled through a two-dimensional granular system by a spring, using a model designed to lend insight into the experimental findings described by Kozlowski et al. [Phys. Rev. E 100, 032905 (2019)]. In that previous study the presence of basal friction between the grains and the base was observed to change the intruder dynamics from clogging to stick-slip. Here we first show that our simulation results are in excellent agreement with the experimental data for a variety of experimentally accessible friction coefficients governing interactions of particles with each other and with boundaries. Then, we use simulations to explore a broader range of parameter space, focusing on the friction between the particles and the base. We consider a range of both static and dynamic basal friction coefficients, which are difficult to vary smoothly in experiments. The simulations show that dynamic friction strongly affects the stick-slip behaviour when the coefficient is decreased below 0.1, while static friction plays only a marginal role in the intruder dynamics.

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“…In particular, the dynamics consists of almost periodic large events, called slips, and of powerlaw distributed smaller events, called microslips ( Fig. 7) [45].…”

Section: A Numerical Modelmentioning

confidence: 99%

Induced and endogenous acoustic oscillations in granular faults

Arcangelis

Lippiello

Ciamarra

et al. 2018

Phil. Trans. R. Soc. A.

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The frictional properties of disordered systems are affected by external perturbations. These perturbations usually weaken the system by reducing the macroscopic friction coefficient. This friction reduction is of particular interest in the case of disordered systems composed of granular particles confined between two plates, as this is a simple model of seismic fault. Indeed, in the geophysical context frictional weakening could explain the unexpected weakness of some faults, as well as earthquake remote triggering. In this manuscript we review recent results concerning the response of confined granular systems to external perturbations, considering the different mechanisms by which the perturbation could weaken a system, the relevance of the frictional reduction to earthquakes, as well as discussing the intriguing scenario whereby the weakening is not monotonic in the perturbation frequency, so that a re-entrant transition is observed, as the system first enters a fluidized state and then returns to a frictional state.

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Statistics of slipping event sizes in granular seismic fault models

Cited by 21 publications

References 44 publications

Dynamics of a grain-scale intruder in a two-dimensional granular medium with and without basal friction

Dynamics of a grain-scale intruder in a two-dimensional granular medium with and without basal friction

Intruder in a two-dimensional granular system: Effects of dynamic and static basal friction on stick-slip and clogging dynamics

Induced and endogenous acoustic oscillations in granular faults

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