[1] We apply adjoint models of mantle convection to North America since the Late Cretaceous. The present-day mantle structure is constrained by seismic tomography and the time-dependent evolution by plate motions and stratigraphic data (paleoshorelines, borehole tectonic subsidence, and sediment isopachs). We infer values of average upper and lower mantle viscosities, provide a synthesis of Nor...

Abstract In flat-slab frames, which are typically designed as secondary seismic structures, the shear failure of slab around column (punching failure) is governing mode limits deformation capacity and can potentially lead to a progressive collapse structure. Existing rules predict flat frames resist imposed lateral displacements without losing capability bear gravity loads have been derived emp...

This paper deals with the modeling of punching shear failure in reinforced concrete slabs using nonlinear finite element analysis. The 3D finite element analyses (FEA) were performed with the appropriate modeling of element size and mesh, and the constitutive modeling of concrete. The FE numerical models are validated by comparing with the experimental results obtained from tested specimens and...

Figure 3. Coronal (top) and axial (bottom) views from a 3D acquisiton slightly above the heart. Images have 2x2x3 mm resolution. The coronal image shows the 4cm, TB=10 slab profile in vivo. The contrast is consistent across the slab, indicating a flat slab profile. The black level is 0 for these images. Introduction: Balanced steady-state free precession (SSFP) imaging (TrueFISP, FIESTA, balanc...

We study steady thin reaction fronts described by the Kuramoto-Sivashinsky equation that separates fluids of different densities. This system may lead to hydrodynamic instabilities as buoyancy forces interact with the propagating fronts in a two-dimensional slab. We use Darcy's law to describe the fluid motion in this geometry. Steady front profiles can be flat, axisymmetric, or nonaxisymmetric...

The morphology of the transition from flat to normal subduction in eastern central Mexico is explored using intraslab earthquakes recorded by temporary and permanent regional seismic arrays. Observations of a sharp transition in slab dip near the abrupt end of the Trans-Mexican Volcanic Belt (TMVB) suggest a possible slab tear located within the subducted South Cocos plate. The eastern lateral ...