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Journal Article
Published: 19 September 2018
Quarterly Journal of Engineering Geology and Hydrogeology (2018) qjegh2017-143.
...-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...
Journal Article
Journal: Geology
Published: 22 March 2018
Geology (2018) 46 (5): 471-474.
... are commonly free or poor of garnet. Based on a study of amphibolite-facies mylonite-pseudotachylyte association of the Mont Mary unit (western Alps) we suggest a general process for garnet disappearance due to thermal shock fragmentation during coseismic frictional heating. We show that garnet has the lowest...
FIGURES
Journal Article
Journal: Geosphere
Published: 28 February 2018
Geosphere (2018) 14 (2): 604-625.
...Matt J. Ikari; Achim J. Kopf; Andre Hüpers; Christoph Vogt AbstractAt convergent margins, marine sediments deposited seaward of the subduction zone forearc on the incoming plate (the “subduction inputs”) represent the initial condition for geomechanical processes during subduction. The frictional...
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Journal Article
Journal: Geology
Published: 04 January 2018
Geology (2018) 46 (3): 223-226.
..., which poured millions of tons of limestone rubble from a cliff top into the valley below, causing 79 deaths. We quantified frictional resistance (µ, 0.1–0.2) and rapid frictional heating using thermogravimetry, mineral alteration close to the sliding surface, and high-speed rotary experiments...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP461.14
EISBN: 9781786203427
... ranged between 3 and 10 mm a −1 . No model configuration resulted in a freeze rate less than 3 mm a −1 . Heating from increases in geothermal flux model boundary conditions resulted in much slower basal temperature evolution than from frictional heating solely at the ice–bed interface, because...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 2017
AAPG Bulletin (2017) 101 (10): 1567-1597.
... to understand the impacts. Eight autoclave experiments reacting Marcellus and Eagle Ford Shale samples with synthetic brines and a friction reducer were conducted for more than 21 days. To better determine mineral dissolution and precipitation at the rock–water interface, the shale samples were ion milled...
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Series: Geological Society, London, Special Publications
Published: 01 January 2017
DOI: 10.1144/SP439.12
EISBN: 9781862399716
..., the synthetic dip adjacent to the fault gives the appearance of so-called ‘drag’, but is not the product of friction on the fault (see Ferrill et al . 2016 b ). Figure 5. Annotated field photograph of the small-displacement faults (heavy red lines) within the Balcones Fault Zone along Green...
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Journal Article
Journal: Geology
Published: 01 December 2016
Geology (2016) 44 (12): 1003-1006.
...B. Proctor; D.A. Lockner AbstractSolidified frictional melts, or pseudotachylytes, are observed in exhumed faults from across the seismogenic zone. These unique fault rocks, and many experimental studies, suggest that frictional melting can be an important process during earthquakes. However...
Journal Article
Journal: Geology
Published: 01 December 2016
Geology (2016) 44 (12): 1059-1062.
...Thomas M. Mitchell; Virginia Toy; Giulio Di Toro; Jörg Renner; Richard H. Sibson AbstractDuring earthquakes, melt produced by frictional heating can accumulate on slip surfaces and dramatically weaken faults by melt lubrication. Once seismic slip slows and arrests, the melt cools and solidifies...
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Journal Article
Journal: Economic Geology
Published: 01 November 2016
Economic Geology (2016) 111 (7): 1705-1729.
... of the Sudbury breccia: (1) in situ frictional or shock melting of target rocks, (2) cataclasis of the target rocks, and/or (3) injection of allochthonous impact melt from the Sudbury Igneous Complex into the brecciated crater floor. This study reports new mineralogical and geochemical data for samples...
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Journal Article
Published: 25 October 2016
Bulletin of the Seismological Society of America (2016) 106 (6): 2764-2776.
... that the intermediate principal stress is equal to the mean stress and then average the results for hydrostatic pore pressure and dry conditions. The details of the estimate are in the Appendix . The effective normal stress is 122 MPa resulting in an initial stress of τ 0 =104  MPa for a Byerlee friction of 0.85...
Journal Article
Published: 04 October 2016
Bulletin of the Seismological Society of America (2016) 106 (6): 2777-2783.
... is that the shear modulus of the rock self‐organizes so that the rock barely fails in friction with typical imposed dynamic strains. The predicted value of stiffness divided by depth is then independent of depth for constant rock density and constant coefficient of friction with the water table at the surface...
Journal Article
Published: 01 September 2016
Journal of Sedimentary Research (2016) 86 (9): 1083-1101.
...Francesco Fidolini; Massimiliano Ghinassi Abstract: Sediment transport and deposition at river-dominated river mouths are controlled by: i) outflow inertia, ii) turbulent bed friction, or iii) outflow buoyancy. In mouth-bar-type deltas, which typically form in shallow-water settings, friction...
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Journal Article
Published: 16 August 2016
Bulletin of the Seismological Society of America (2016) 106 (5): 2302-2312.
...Norman H. Sleep; Nori Nakata AbstractStrong Rayleigh waves are expected to bring the shallow subsurface into frictional failure. They may nonlinearly interact with high‐frequency S waves. The widely applied Drucker and Prager (1952) rheology predicts that horizontal compression half‐cycle...
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Journal Article
Published: 29 July 2016
Geological Magazine (2016) 153 (5-6): 827-844.
... Friction coefficient 0.85 0.73 0.85 Cohesion (MPa) 10–20 1.4 × 10 −4 1.4–2.8 × 10 −5 Non-dimensional shear strength ratio, ρlg/τ 0 0.38–0.76 0.1 0.1–0.3 Strike-slip fault systems commonly show an anastomosing array of contemporaneous faults including rhomb-shaped pull-apart...
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Journal Article
Published: 07 July 2016
Journal of the Geological Society (2016) 173 (6): 949-953.
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Journal Article
Published: 28 June 2016
Geological Magazine (2016) 153 (5-6): 811-826.
... in a relatively strong crust (basement) and filled with weak syn-rift sediments (cover). We investigate the relative influence of the internal friction (µ) of the basin-bounding normal fault, tectonic burial (h) under an overlying nappe and the geothermal gradient. We use...
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Journal Article
Published: 07 June 2016
Bulletin of the Seismological Society of America (2016) 106 (4): 1772-1787.
...Naoyuki Kato AbstractNumerical simulations of complex earthquake cycles are conducted using a model with two patches (asperities) on a fault, where friction obeys a rate‐and‐state‐dependent law. The patches are represented by regions of steady‐state velocity‐weakening friction and are in contact...
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Journal Article
Published: 03 June 2016
Geological Magazine (2016) 153 (5-6): 845-865.
... are made of glass, resulting in a model with a relatively high basal friction. Side walls are not lubricated during experimental runs, as the model apparatus is sufficiently wide to obtain results in the centre of the apparatus which are free from edge effects. An empirical rule...
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Journal Article
Published: 24 May 2016
Bulletin of the Seismological Society of America (2016) 106 (3): 819-831.
... hypocentral area. This unusual phenomenon may have provided a second breath to the rupture that enhanced its final size. Here, we propose that rupture reactivation may have been governed by a slip‐weakening friction model with two sequential strength drops, the second one being activated at large slip...
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