RSFit3000: A MATLAB GUI-based program for determining rate and state frictional parameters from experimental data

Skarbek, R. M.; Savage, H. M.

doi:10.1130/ges02122.1

Cited by 47 publications

(35 citation statements)

References 44 publications

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“…The results of recent seismological studies showed that plate interfaces in a shallow mantle wedge have a nearly lithostatic pore pressure due to slab-derived water at various subduction zones in SE Japan, Cascadia, central Mexico, and Hikurangi (Audet et al, 2009;Audet and Kim, 2016;Eberhart-Phillips and Reyners, 2012;Matsubara et al, 2009;Shelly et al, 2006;Song and Kim, 2012). Such low effective normal stress conditions are conducive to brittle deformation rather than ductile behavior (French and Condit, 2019;Gao and Wang, 2017).…”

Section: Application To the Mantle Wedge Conditionsmentioning

confidence: 99%

“…In addition, nearly lithostatic pore pressure conditions, which lead to low effective normal stress conditions, have been inferred based on seismic velocity structures at the plate interfaces of several subduction zones where slow earthquakes coincidently occur in regions such as Cascadia, SW Japan, central Mexico, and Hikurangi (Audet et al, 2009;Audet and Kim, 2016;Eberhart-Phillips and Reyners, 2012;Matsubara et al, 2009;Shelly et al, 2006;Song and Kim, 2012). This low effective normal stress condition may be correlated with slow earthquakes because frictional deformation becomes dominant, rather than viscous deformation, in terms of shear strength (French and Condit, 2019;Gao and Wang, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Effect of normal stress on the frictional behavior of brucite: application to slow earthquakes at the subduction plate interface in the mantle wedge

et al. 2021

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Abstract. We report the results of friction experiments on brucite under both dry and wet conditions under various normal stresses (10–60 MPa). The final friction coefficients of brucite were determined to be 0.40 and 0.26 for the dry and wet cases, respectively, independent of the normal stress. Under dry conditions, velocity-weakening behavior was observed in all experiments at various normal stresses. Under wet conditions, velocity weakening was observed at low normal stress (10 and 20 MPa), whereas velocity strengthening was determined at a higher applied normal stress. Microstructural observations of recovered experimental samples indicate localized deformation within a narrow shear band, implying that a small volume of brucite can control the bulk frictional strength in an ultramafic setting. Among serpentinite-related minerals, weak and unstable frictional behavior of brucite under hydrated mantle wedge conditions may play a role in slow earthquakes at the subduction plate interface in the mantle wedge.

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Section: Application To the Mantle Wedge Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of normal stress on the frictional behavior of brucite: application to slow earthquakes at the subduction plate interface in the mantle wedge

et al. 2021

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“…To determine the velocity dependence of friction, data were fit with the rate-and-state friction relation using an iterative least squares inversion method (Reinen & Weeks, 1993) and the RS3000 code developed for triaxial deformation apparatus (Skarbek & Savage, 2019). Individual rate-steps were de-trended using a linear fit to the 300 μm before the rate-step to correct for slip hardening, and the 400 μm following each rate-step was used to model the evolution of friction.…”

Section: Rate-and-state Fittingmentioning

confidence: 99%

Frictional Strengths of Subduction Thrust Rocks in the Region of Shallow Slow Earthquakes

et al. 2020

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Earthquakes are expected to nucleate within velocity‐weakening materials; however, at the updip limit of the subduction seismogenic zone, the principal lithologies exhibit velocity‐strengthening behavior. At an exhumed analogue for present‐day subduction at Nankai (the Mugi Mélange, Japan) two examples of paleoseismic features occur within altered basalts, suggesting that they may be velocity‐weakening. We shear altered basalt and shale matrix from the mélange in the triaxial saw cut configuration at in situ conditions of deformation (Pc = 120 MPa, T = 150 °C) for two pore fluid factors (λ = 0.36, 0.7). The shale matrix exhibits a coefficient of friction between 0.4 and 0.5, and velocity‐strengthening behavior. Altered basalt exhibits Byerlee friction and velocity‐weakening behavior. In most experiments deformation was partitioned into Riedel shears, which have a lower percentage of clasts, clast size distributions with higher fractal dimensions, and shape factors indicating rounder clasts compared to the matrix between Riedel shears. We hypothesize that earthquakes preferentially nucleate within altered basalt at the updip limit of the seismogenic zone. More complex forms of deformation (e.g., shallow very low frequency earthquakes) may occur by mixing velocity‐weakening altered basalt into the velocity‐strengthening shale matrix. In subduction zones where the matrix is composed of shale, this complex behavior is limited to shallow depths (T < ~250 °C), above the updip transition to velocity‐weakening behavior for the matrix. Altered basalt is a ubiquitous subducting material, and future studies on its behavior through a range of subduction zone conditions are required for a full understanding of the mechanical behavior of subduction zones.

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“…Then, we inverted the frictional parameters from experimental measurements by modeling the velocity steps, assuming the rate-and-state slip law (Ruina, 1983;equation 2). The inversion of the experimental data was made using the software package developed by Skarbek and Savage (2019; Figure 5b). The rate-and-state parameters found ( Figure 6) show (i) No significant difference between the experiment with P f = 1 or 10 MPa.…”

Section: 1029/2019jb018517mentioning

confidence: 99%

Fault Reactivation During Fluid Pressure Oscillations: Transition From Stable to Unstable Slip

et al. 2019

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High-pressure fluid injection in deep georeservoirs can induce earthquakes. Recent observations suggest that cyclic injections might trigger less seismicity than monotonic injections. Here, we report triaxial laboratory experiments conducted on faulted quartz-rich sandstone that provide new insight into the physics of fault-fluid interactions subjected to cyclic fluid pressure variations. The experiments were performed at 30 and 45 MPa confining pressure, imposing constant or sinusoidal fluid pressure oscillations of amplitudes ranging from 0 to 8 MPa in addition to a far-field constant loading rate (10 −4 and 10 −3 mm s −1 ). The results show that (i) in agreement with the Mohr-Coulomb theory, faults reactivate at the static friction criterion, which is generally reached at the maximum fluid pressure during oscillations. (ii) Oscillating fluid pressure perturbations promote seismic behavior rather than aseismic slip, and (iii) increasing the oscillation's amplitude enhances the onset of seismic activity along the fault. We demonstrate that this behavior is caused by slip rate variations resulting from the fluid pressure oscillations. Without fluid pressure oscillations, increasing the far-field loading rate also promotes seismic activity. Our experiments demonstrate that the seismicity intensification due to cyclic fluid injections could be promoted at shallow depth, where confining pressure is relatively low, resulting in large strain rate perturbations.

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RSFit3000: A MATLAB GUI-based program for determining rate and state frictional parameters from experimental data

Cited by 47 publications

References 44 publications

Effect of normal stress on the frictional behavior of brucite: application to slow earthquakes at the subduction plate interface in the mantle wedge

Effect of normal stress on the frictional behavior of brucite: application to slow earthquakes at the subduction plate interface in the mantle wedge

Frictional Strengths of Subduction Thrust Rocks in the Region of Shallow Slow Earthquakes

Fault Reactivation During Fluid Pressure Oscillations: Transition From Stable to Unstable Slip

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