Hybrid thrust sequences – A new structural perspective

Nabavi, Seyed Tohid; Ruh, Jonas B.

doi:10.1016/j.jseaes.2023.105701

Cited by 4 publications

(3 citation statements)

References 189 publications

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“…The deformed surfaces of orogenic belts and continental basins are irregular because of the dynamic movements caused by surface processes (Dal Zilio et al., 2020; Hardy & Cardozo, 2021; Nabavi & Ruh, 2023; Ruh, 2020; Ruh et al., 2018) such as sediment transportation, erosion, and sedimentation. At stress‐free interfaces, undulations naturally occur where there are significant contrasts in density and strength between solid earth materials (e.g., rock and soil) and fluid (e.g., air and water) (Kramer et al., 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Many numerical models can be used to quantify the mechanical responses of all the evolutional processes of geological structures by deriving strain‐rate and stress tensors. Previous continuum based numerical modeling (e.g., finite element and difference methods) studies have attempted to handle the irregular free surface evolution and the strain heterogeneity near the faults associated with brittle and plastic deformation (Buiter et al., 2016; Dean et al., 2013; Li et al., 2021; Nabavi & Ruh, 2023; Yang et al., 2017). In continuum models, abrupt brittle deformation at near‐surfaces may cause numerical instabilities due to mesh distortion and the strength contrasts between air and sediment.…”

Section: Introductionmentioning

confidence: 99%

“…This can be achieved by calculating the Green strain tensor, which indicates the deformation intensity in the horizontal, vertical, and shear directions. Analyzing strain distribution allows us to distinguish areas under high stress and failure potential and visualize fault development by identifying strain localization zones (Alsop et al., 2018; Nabavi & Ruh, 2023). Therefore, the ability to detect and track microfracture evolution using strain analysis provides key insights into the mechanical behavior of geological structures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New Particle‐Wise Finite Element Strain Analysis for Discrete Displacement of Fold‐And‐Thrust Belt and Horst‐And‐Graben Models

An,

So,

Kim

2023

Earth and Space Science

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The granular behaviors of shallow Earth materials are associated with brittle deformations and mass transport along the surface and fault zones. Green strain has been adopted to quantitatively analyze the fold‐and‐thrust belt and horst‐and‐graben discrete element (DE) models driven by contractional and extensional forces, respectively. Deriving Green strain from DE models is challenging because of the need for precise mapping of the discrete particle displacement onto differentiable meshes. Here, we developed a new Green strain calculation methodology, the implicit global‐finite element method (IG‐FEM), which inverts a global matrix to reflect the interconnectivity of all particles. The IG‐FEM obtains strain quantities associated with particles to prevent an information loss, for example, displacement, at particle positions. We validated the accuracy of IG‐FEM compared to the conventional strain analysis scheme for DE model, finite difference method (FDM), by estimating the relative root mean square error from analytical solutions for a given mathematical transformation. On average, the IG‐FEM and the FDM show 2.8% and 17.4% relative root mean square errors, respectively. Furthermore, the strain quantities in the fold‐and‐thrust belt and horst‐and‐graben DE models were computed. The strain patterns of the IG‐FEM are more consistent with the particle spin distribution, which is noninterpolated information of the DE models. We present the potential benefits of the IG‐FEM for assessing strain‐related values such as stress, pore pressure, and seismic velocities within brittle deformation zones. The IG‐FEM is applicable in analog models and geodetic surveys to extract strain from discrete displacement data.

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