160 citations · 645 across the 24 of their papers we have counts for
24 papers · 1 filter
Pore pressure change during nucleation and slip along experimental faults
Nicolas Brantut, François X. Passelègue, Pierre Dublanchet
In order to clarify the main controlling factors influencing fluid pressure changes in fault zones during the seismic cycle, we conducted laboratory rock friction experiments where…
Microstructural evolution of Carrara marble during semi-brittle deformation
Tongzhang Qu, Nicolas Brantut, David Wallis +1
Fifteen marble samples were subjected to semi-brittle deformation through triaxial compression experiments, reaching axial strains of 0.5%, 1.0%, 2.0%, 4.0%, or 7.5% at temperature…
Analysis of stress in the cohesive zone, dissipation and fracture energy during shear rupture experiments
Nicolas Brantut
We analyse high resolution slip rate data obtained during dynamic shear rupture experiments by Berman et al. (2020). We use an inverse method to extract the details of strength evo…
Semi-brittle flow of rocks: Cracks, dislocations and strain hardening
Nicolas Brantut
Strain hardening is a key feature observed in many rocks deformed in the so-called ``semi-brittle'' regime, where both crystal plastic and brittle deformation mechanisms operate. D…
Opposite variations for pore pressure on and off the fault during simulated earthquakes in the laboratory
Dong Liu, Nicolas Brantut, Franciscus M. Aben
We measured the spatiotemporal evolution of pore pressure on- and off-fault during failure and slip in initially intact Westerly granite under triaxial conditions. The pore pressur…
Shear localisation controls the dynamics of earthquakes
Fabian Barras, Nicolas Brantut
Earthquakes are produced by the propagation of rapid slip along tectonic faults. The propagation dynamics is governed by a balance between elastic stored energy in the surrounding…
Grain-size effects during semi-brittle flow of calcite rocks
Christopher Harbord, Nicolas Brantut, David Wallis
We study the role of grain size in the rheological behaviour of calcite aggregates in the semi-brittle regime. We conduct triaxial deformation tests on three rocks, Solnhofen limes…
Micromechanical controls on the brittle-plastic transition in rocks
Dong Liu, Nicolas Brantut
The rheology of rocks transitions from a localized brittle behaviour to distributed plastic behaviour with increasing pressure and temperature. This brittle-plastic is empirically…
Rupture and afterslip controlled by spontaneous local fluid flow in crustal rock
Frans M. Aben, Nicolas Brantut
Shear rupture and fault slip in crystalline rocks like granite produce large dilation, impacting the spatiotemporal evolution of fluid pressure in the crust during the seismic cycl…
Micromechanics of rock damage and its recovery in cyclic loading conditions
Nicolas Brantut, Léo Petit
Under compressive stress, rock ``damage'' in the form of tensile microcracks is coupled to internal slip on microscopic interfaces, such as preexisting cracks and grain boundaries.…
A high pressure, high temperature gas medium apparatus to measure acoustic velocities during deformation of rock
Christopher Harbord, Nicolas Brantut, Emmanuel David +1
A new set-up to measure acoustic wave velocities through deforming rock samples at high pressures (up to 1000 MPa), temperatures (up to 700C) and differential stress (up to…
On the scale dependence in the dynamics of frictional rupture: constant fracture energy versus size-dependent breakdown work
Federica Paglialunga, François Passelègue, Nicolas Brantut +3
Potential energy stored during the inter-seismic period by tectonic loading around faults is released during earthquakes as radiated energy, heat and fracture energy. The latter is…
Dilatancy toughening of shear cracks and implications for slow rupture propagation
Nicolas Brantut
Dilatancy associated with fault slip produces a transient pore pressure drop which increases frictional strength. This effect is analysed in a steadily propagating rupture model th…
Dilatancy stabilises shear failure in rock
Franciscus M. Aben, Nicolas Brantut
Failure and fault slip in crystalline rocks is associated with dilation. When pore fluids are present and drainage is insufficient, dilation leads to pore pressure drops, which in…
Off-fault damage characterisation during and after experimental quasi-static and dynamic rupture in crustal rock from laboratory P-wave tomography and microstructures
Franciscus M. Aben, Nicolas Brantut, Thomas M. Mitchell
Elastic strain energy released during shear failure in rock is partially spent as fracture energy to propagate the rupture further. is dissipated within the rupture tip pro…
Fluid pressure heterogeneity during fluid flow in rocks: New laboratory measurement device and method
Nicolas Brantut, Franciscus M. Aben
We present a new type of transducer capable of measuring local pore fluid pressure in jacketed rock samples under elevated confining pressure conditions. The transducers are passiv…
Micromechanics of high pressure compaction in granular quartz aggregates
Suzanne J. T. Hangx, Nicolas Brantut
The mechanical behaviour of porous sandstones is generally modelled using concepts from granular mechanics, often overlooking the effect of cementation. To probe the key difference…
Insight into the microphysics of antigorite deformation from spherical nanoindentation
Lars N. Hansen, Emmanuel C. David, Nicolas Brantut +1
The mechanical behavior of antigorite strongly influences the strength and deformation of the subduction interface. Although there is microstructural evidence elucidating the natur…
Stability of pulse-like earthquake ruptures
Nicolas Brantut, Dmitry I. Garagash, Hiroyuki Noda
Pulse-like ruptures arise spontaneously in many elastodynamic rupture simulations and seem to be the dominant rupture mode along crustal faults. Pulse-like ruptures propagating und…
Dilatancy-induced fluid pressure drop during dynamic rupture: Direct experimental evidence and consequences for earthquake dynamics
Nicolas Brantut
Fluid pressure and flow in the crust is a key parameter controlling earthquake physics. Since earthquake slip is linked to spatio-temporal localisation of deformation, it is expect…
Low-Frequency Measurements of Seismic Velocity and Attenuation in Antigorite Serpentinite
Emmanuel C. David, Nicolas Brantut, Lars N. Hansen +1
Laboratory measurements of seismic velocity and attenuation in antigorite serpentinite at a confining pressure of kbar and temperatures up to C (i.e., in the antigor…
Fault reactivation by fluid injection: Controls from stress state and injection rate
François. X. Passelègue, Nicolas Brantut, Thomas M. Mitchell
We studied the influence of stress state and fluid injection rate on the reactivation of faults. We conducted experiments on a saw-cut Westerly granite sample under triaxial stress…
Influence of fluids on ratio: Increase or decrease?
Nicolas Brantut, Emmanuel C. David
The evolution of with increasing fluid-saturated porosity is computed for isotropic rocks containing spheroidal pores. is sh…
Assessing the efficiency of thermal pressurisation using natural pseudotachylyte-bearing rocks
Nicolas Brantut, Thomas M. Mitchell
The efficiency of thermal pressurisation as a dynamic weakening mechanism relies on the thermal and hydraulic properties of the rocks forming the fault core. Here, we assess the ef…