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friction

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Journal Article
Journal: Interpretation
Published: 11 May 2020
Interpretation (2020) SM39–SM52.
... of the Gangjiang Delta to reveal the deposition along the shoreline of the lacustrine shallow-water delta. The numerical simulation shows that the shallow-water delta is dominated by bed friction with an extensive hydrodynamical boundary layer. The bed shear stress, which varies with the changes in river flux...
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Journal Article
Journal: Geology
Published: 18 March 2020
Geology (2020) 48 (5): 514–518.
... ). However, documenting coseismic paleotemperatures in exhumed fault rocks is challenging, owing to overprinting thermal, physio-chemical, and deformation processes ( Rowe and Griffith, 2015 ). Thermally activated dynamic weakening processes include frictional melting ( Sibson, 1975 ; Di Toro et al., 2006...
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Journal Article
Journal: Geology
Published: 09 January 2020
Geology (2020) 48 (3): 283–287.
... embeds a large number of isolated pulverized quartz clasts (PQCs). Structural analysis indicates that the gouge fabric was mainly developed by slow frictional sliding along phyllosilicate-lined Riedel shear bands during continued shearing. In contrast, the PQCs show tensile fracture network features...
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Journal Article
Journal: GSA Bulletin
Published: 31 December 2019
GSA Bulletin (2020) 132 (9-10): 1817–1828.
... normal faults are poorly oriented in the stress field (≥60° from σ 1 ) and weak (low friction). In contrast, models for low-angle normal fault formation in isotropic rocks typically assume Coulomb failure and require inclined σ 1 (no misorientation). Here, a data-based, mechanical-tectonic model...
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Journal Article
Journal: Geology
Published: 15 October 2019
Geology (2019) 47 (12): 1203–1207.
...A.K. Ault; J.L. Jensen; R.G. McDermott; F.-A. Shen; B.R. Van Devener Abstract Friction-generated heat and the subsequent thermal evolution control fault material properties and thus strength during the earthquake cycle. We document evidence for transient, nanoscale fault rheology on a high-gloss...
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Series: Geological Society, London, Special Publications
Published: 30 September 2019
DOI: 10.1144/SP477.3
EISBN: 9781786203861
... frictional resistance and increased excess pore pressure. Excess pore pressure increases in buried sedimentary layers in response to high sedimentation rates, but vertical variations in pore pressure can also be controlled by lithological differences ( Sultan et al. 2004 ). In active continental-margin...
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Series: Geological Society, London, Special Publications
Published: 30 September 2019
DOI: 10.1144/SP477.32
EISBN: 9781786203861
... to simulate turbidity currents over an erodible sediment bed was built based on the Saint-Venant solver in the open-source code Basilisk. A modified HLLC solver for the new Riemann Problem was proposed. The model takes deposition, entrainment and friction into consideration, and numerically solves the full...
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Journal Article
Journal: Geosphere
Published: 10 September 2019
Geosphere (2019) 15 (5): 1665–1676.
...Rob M. Skarbek; Heather M. Savage Abstract We present a MATLAB graphical user interface (GUI) software package for analyzing rate and state friction experiments. Called RSFit3000, the software allows users to easily determine frictional parameters by fitting velocity-step and slide-hold-slide...
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Journal Article
Journal: AAPG Bulletin
Published: 15 June 2019
AAPG Bulletin (2019) 103 (6): 1383–1400.
... shear fractures. The angle between the shear fractures and maximum principal stress is equal to 45° ± φ /2, with φ being the internal friction angle. The shear strength depends on the cohesive force, the internal friction angle, and the positive stress on the shear fracture surface, which can...
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Journal Article
Journal: Geology
Published: 31 May 2019
Geology (2019) 47 (8): 744–748.
...) during failure of carbonates at shallow depth conditions ( Schubnel et al., 2006 ; Nicolas et al., 2017 ). To investigate the frictional stability of carbonates, recent experimental studies focused on the frictional behavior of calcite- and dolomite-rich fault rocks sheared at subseismic to seismic slip...
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Journal Article
Journal: AAPG Bulletin
Published: 15 May 2019
AAPG Bulletin (2019) 103 (5): 1153–1177.
... as R and some R’ fracture sets, where R and R’ represent an angle of approximately Φ /2 and 90- Φ /2 to the general shear-zone direction, respectively, where Φ is the angle of internal friction ( Riedel, 1929 ). The R’ set is bedding parallel, whereas R-fractures terminate on bedding interfaces...
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Journal Article
Published: 07 May 2019
Bulletin of the Seismological Society of America (2019) 109 (3): 1164–1170.
...Naum I. Gershenzon Abstract Here, we re‐examine the necessary and sufficient conditions for instability of frictional sliding based on a dynamic model derived from the Frenkel–Kontorova model and the rate‐and‐state frictional law. Two main findings follow from our analysis. First, sliding...
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Journal Article
Published: 01 May 2019
Rocky Mountain Geology (2019) 54 (1): 1–17.
... record predominantly strike-slip motion, and 74% of measured faults in Precambrian rocks have slickenline rakes < 45°. Frictional-sliding analysis suggests that < 7% of Precambrian basement fabrics were favorably oriented for reactivation as reverse faults in the Laramide stress field. We propose...
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Journal Article
Journal: Geology
Published: 28 February 2019
Geology (2019) 47 (4): 343–346.
...Tsuyoshi Ishikawa; Kohtaro Ujiie Abstract Pseudotachylytes found in exhumed accretionary complexes are important for understanding earthquake faulting in subduction zones. However, frictional melting processes in a subduction zone fault under wet conditions remain poorly understood, mainly because...
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Journal Article
Journal: Interpretation
Published: 07 February 2019
Interpretation (2019) 7 (1): SA21–SA27.
... intensity factor criterion. The hydraulic behavior of these faces is governed by a Barton-Bandis model ( Barton et al., 1985 ), and the contact behavior is based upon Coulomb or rate- and state-dependent friction ( Dieterich, 1979 ). A comprehensive discussion regarding the numerical formulation, fracture...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 06 February 2019
Lithosphere (2019) 11 (3): 322–332.
... responds to a population balance equation, with nucleation, strengthening, and failure of patches of the interface that have greater static frictional strength, defined in the model as “asperities.” An exponential rate law for nucleation and strengthening, based on Arrhenius equation silica kinetics, leads...
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Journal Article
Journal: Interpretation
Published: 23 January 2019
Interpretation (2019) 7 (1): T207–T219.
... is the Young’s modulus, ν is the Poisson’s ratio, T is the tensile strength, C is the cohesion, and φ is the internal friction angle. Unit type Density ( g · cm − 3 ) E (GPa) ν T (MPa) C (MPa) φ (°) Fault zone...
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Journal Article
Published: 19 September 2018
Quarterly Journal of Engineering Geology and Hydrogeology (2019) 52 (1): 46–60.
...-coated and -cemented discontinuities have a marked higher shear friction, while staining has little influence on friction. Discontinuities with iron-coating and -cementing reduce the susceptibility to weathering of a rock mass as weathered material is less easily eroded and underlying material...
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Journal Article
Journal: Geology
Published: 02 August 2018
Geology (2018) 46 (9): 807–810.
... centerline velocity of 345 m yr –1 (∼10 −5 m s −1 ), and once a steady-state sliding friction coefficient, μ ss , was attained, slip was stopped. After slip surfaces were held in stationary contact for a given duration (hold time), sliding was re-initiated. Slip resistance then abruptly rose above...
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Journal Article
Journal: Geology
Published: 30 May 2018
Geology (2018) 46 (7): 583–586.
.... MSs produced during high-velocity friction experiments (>0.1 m s –1 ) are typically interpreted to be frictional principal slip surfaces, where weakening mechanisms are activated by shear heating. We re-examined this model by performing friction experiments in a rotary shear apparatus on calcite...
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