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Slab

About: Slab is a research topic. Over the lifetime, 31617 publications have been published within this topic receiving 318693 citations.


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TL;DR: In this paper, the response of slab structures after initial failure is investigated in order to determine a means of preventing progressive collapse, and analytical models for predicting the post-failure response of slabs are presented and the predictions are compared with experimental results.
Abstract: The response of slab structures after initial failure is investigated in order to determine a means of preventing progressive collapse. Analytical models for predicting the post‐failure response of slabs are presented and the predictions are compared with experimental results. These analytical models along with an experimental investigation enabled the development of simple design and detailing guidelines for bottom slab reinforcement which is capable of hanging the slab from the columns after initial failures due to punching shear and flexure.

119 citations

Journal ArticleDOI
TL;DR: The effects of plate rheology (strong plate interiors and weak plate margins) and stiff subducted lithosphere (slabs) on the geoid and plate motions, considered jointly, are examined with three-dimensional spherical models of mantle flow.

119 citations

Journal ArticleDOI
TL;DR: In this paper, the authors constrain the relative importance of slab suction and slab pull by comparing Cenozoic plate motions to model predictions that include viscous mantle flow and a proxy for slab strength.
Abstract: Although mantle slabs ultimately drive plate motions, the mechanism by which they do so remains unclear. A detached slab descending through the mantle will excite mantle flow that exerts shear tractions on the base of the surface plates. This "slab suction'' force drives subducting and overriding plates symmetrically toward subduction zones. Alternatively, cold, strong slabs may effectively transmit stresses to subducting surface plates, exerting a direct "slab pull'' force on these plates, drawing them rapidly toward subduction zones. This motion induces mantle flow that pushes overriding plates away from subduction zones. We constrain the relative importance of slab suction and slab pull by comparing Cenozoic plate motions to model predictions that include viscous mantle flow and a proxy for slab strength. We find that slab pull from upper mantle slabs combined with slab suction from lower mantle slabs explains the observation that subducting plates currently move similar to4 times faster than nonsubducting plates. This implies that upper mantle slabs are strong enough to support their own weight. Slab suction and slab pull presently account for about 40 and 60% of the forces on plates, but slab suction only similar to30% if a low-viscosity asthenosphere decouples plates from mantle flow. The importance slab pull has been increasing steadily through the Cenozoic because the mass and length of upper mantle slabs has been increasing. This causes subducting plates to double their speed relative to nonsubducting plates during this time period. Our model explains this temporal evolution of plate motions for the first time.

118 citations

Journal ArticleDOI
TL;DR: In this article, the authors compared subduction zone earthquake magnitudes to tectonically constrained estimates of the degree to which each slab transmits its excess weight as a direct pull force on a subducting plate.

118 citations

Journal ArticleDOI
TL;DR: The distribution and magnitude of the strike-parallel component of velocity in an obliquely converging thrust wedge or accretionary prism are determined by the geometry and mechanical properties of the wedge as discussed by the authors.
Abstract: The distribution and magnitude of the strike-parallel component of velocity in an obliquely converging thrust wedge or accretionary prism are determined by the geometry and mechanical properties of the wedge A mechanical analysis based on the assumption of a critical or stable geometry of the wedge, for which the rate of cross-strike deformation is zero, leads to the following conclusions for different bulk rheologies (1) In a linear viscous wedge, the strike-parallel motion relative to the underthrust slab decreases exponentially away from the rear and is effectively concentrated in a shear zone with a width comparable to the thickness of the wedge at the rear The wedge also deforms by corner flow, producing a circulation in the cross-strike plane The strike-parallel and corner flow velocities depend on the thickness and viscosity of the wedge and on the shear stresses applied to its lower and rear boundaries Convergence at the wedge front is normal to strike (2) A critically tapered perfect plastic wedge moves coherently without internal deformation For low and moderate obliquities of the convergence vector, the wedge moves at the same velocity as the backstop (upper plate) For high angles of obliquity, the wedge moves laterally relative to the underthrust slab at a maximum velocity dependent on its dimensions and the stress conditions on its boundaries, so that it is separated from the upper plate by a strike-slip fault, defining a forearc sliver No geometrical configuration exists that allows the strike-parallel motion to be distributed through the wedge (3) A noncohesive Coulomb wedge behaves in much the same way as a plastic wedge, but the geometry and velocity depend only on its mechanical properties and the shear stresses on its boundaries, and they are independent of scale

118 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
20231,170
20222,180
2021774
20201,133
20191,317