Off‐fault plasticity and earthquake rupture dynamics: 1. Dry materials or neglect of fluid pressure changes

Templeton, E. L.; Rice, James R.

doi:10.1029/2007jb005529

Cited by 160 publications

(236 citation statements)

References 58 publications

Supporting

Mentioning

210

Contrasting

Order By: Relevance

“…[3] In part 1 of this study, Templeton and Rice [2008] considered dynamic rupture in an elastic-plastic material, which was considered to be dry, or simply to have negligible changes in pore pressure during rupture. They considered a Mohr-Coulomb type of plasticity in the form of the Drucker-Prager model and presented several key results; specifically, that the extent and distribution of the off-fault inelastic deformation is dependent on the initial loading direction of the fault, and the initial proximities of the fault and off-fault material to failure.…”

Section: Objectives Of the Present Workmentioning

confidence: 99%

Off‐fault plasticity and earthquake rupture dynamics: 2. Effects of fluid saturation

2008

Self Cite

View full text Add to dashboard Cite

[1] We present an analysis of inelastic off-fault response in fluid-saturated material during earthquake shear rupture. The analysis is conducted for 2-D plane strain deformation using an explicit dynamic finite element formulation. Along the fault, linear slip-weakening behavior is specified, and the off-fault material is described using an elastic-plastic description of the Drucker-Prager form, which characterizes the brittle behavior of rocks under compressive stress when the primary mode of inelastic deformation is frictional sliding of fissure surfaces, microcracking and granular flow. In this part (part 1), pore pressure changes were neglected in materials bordering the fault. In part 2, we more fully address the effects of fluid saturation. During the rapid stressing by a propagating rupture, the associated undrained response of the surrounding fluid-saturated material may be either strengthened or weakened against inelastic deformation. We consider poroelastoplastic materials with and without plastic dilation. During nondilatant undrained response near a propagating rupture, large increases in pore pressure on the compressional side of the fault decrease the effective normal stress and weaken the material, and decreases in pore pressure on the extensional side strengthen the material. Positive plastic dilatancy reduces pore pressure, universally strengthening the material. Dilatantly strengthened undrained deformation has a diffusive instability on a long enough timescale when the underlying drained deformation is unstable. Neglecting this instability on the short timescale of plastic straining, we show that undrained deformation is notably more resistant to shear localization than predicted by neglect of pore pressure changes.Citation: Viesca, R. C., E. L. Templeton, and J. R. Rice (2008), Off-fault plasticity and earthquake rupture dynamics: 2. Effects of fluid saturation,

show abstract

Section: Objectives Of the Present Workmentioning

confidence: 99%

Off‐fault plasticity and earthquake rupture dynamics: 2. Effects of fluid saturation

2008

Self Cite

View full text Add to dashboard Cite

show abstract

“…For instance, Templeton and Rice [2008] found that off-fault plasticity was delaying the supershear transition. Previously, Andrews [2005] showed that the total fracture energy, including the energy dissipated inelastically, is increasing linearly with rupture propagation distance.…”

Section: Introductionmentioning

confidence: 99%

Off‐fault plasticity favors the arrest of dynamic ruptures on strength heterogeneity: Two‐dimensional cases

Hok

Campillo

Cotton

et al. 2010

Geophysical Research Letters

View full text Add to dashboard Cite

[1] We study the effects of a plastic behavior of the volume around the fault on in-plane and anti-plane 2D rupture dynamics. Both rupture modes exhibit similar answer to off-fault yielding, in terms of modification of the kinematics of the rupture front, and in terms of energy lost outside the fault plane. We then compare the ability of the rupture to propagate through a barrier on the interface. The plastic behavior, responsible for a linear increase of the global fracture energy during dynamic crack growth, enhances the rupture front sensitivity to a static resistance increase on the fault. Consequently, the rupture arrest is more easily provoked in heterogeneous models that include a plastic yielding, even with relatively small variations of frictional resistance along the fault plane. Citation: Hok, S., M. Campillo, F. Cotton, P. Favreau, and I. Ionescu (2010), Offfault plasticity favors the arrest of dynamic ruptures on strength heterogeneity: Two-dimensional cases, Geophys. Res. Lett., 37, L02306,

show abstract

“…We use such an approach here to gain insights into influential processes at the rupture front. The treatment of the model domain is similar to that described in Templeton and Rice (2008) and Viesca et al (2008), who examined rupture in an unbounded medium. 4-noded plane-strain, reduced-integration elements compose the bulk and a predefined split-node interface represents a likely failure plane.…”

Section: Finite Element Model Of a Dynamic Subsurface Rupturementioning

confidence: 99%

“…The rupture criterion set by the surface weakening behavior eliminates stress singularities, however there remain significant stress concentrations. It is well known in dynamic shear rupture that in such cases regions of inelastic deformation grow, with propagation, to dimensions significant in comparison to rupture length (e.g., Templeton and Rice 2008) and one can expect such regions of failure around the rupture tip in the quasi-static limit. In the following we propose a model in which pore pressure on the slip-surface is determined by the poro-elastic-plastic deformation and consequent fluid flux surrounding the slip surface.…”

Section: Introductionmentioning

confidence: 99%

Modeling Slope Instability as Shear Rupture Propagation in a Saturated Porous Medium

Viesca

Rice

2010

Submarine Mass Movements and Their Consequences

View full text Add to dashboard Cite

The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters AbstractWhen a region of intense shear in a slope is much thinner than other relevant geometric lengths, this shear failure may be approximated as localized slip like in faulting, with strength determined by frictional properties of the sediment and effective stress normal to the failure surface. Peak and residual frictional strengths of submarine sediments indicate critical slope angles well above those of most submarine slopes-in contradiction to abundant failures. Because deformation of sediments is governed by effective stress, processes affecting pore pressures are a means of strength reduction. However, common methods of examining slope stability neglect dynamically variable pore pressure during failure. We examine elastic-plastic models of the capped Drucker-Prager type and derive approximate equations governing pore pressure about a slip surface when the adjacent material may deform plastically. In the process we identify an elastic-plastic hydraulic diffusivity with an evolving permeability and plastic storage term analogous to the elastic term of traditional poroelasticity. We also examine their application to a dynamically propagating subsurface rupture and find indications of downslope directivity.

show abstract

Off‐fault plasticity and earthquake rupture dynamics: 1. Dry materials or neglect of fluid pressure changes

Cited by 160 publications

References 58 publications

Off‐fault plasticity and earthquake rupture dynamics: 2. Effects of fluid saturation

Off‐fault plasticity and earthquake rupture dynamics: 2. Effects of fluid saturation

Off‐fault plasticity favors the arrest of dynamic ruptures on strength heterogeneity: Two‐dimensional cases

Modeling Slope Instability as Shear Rupture Propagation in a Saturated Porous Medium

Contact Info

Product

Resources

About