Three-dimensional spherical models of layered and whole mantle convection

1993 ◽  
Vol 98 (B12) ◽  
pp. 21969-21976 ◽  
Author(s):  
Gary A. Glatzmaier ◽  
Gerald Schubert
Keyword(s):  
Mantle Convection ◽  
Three Dimensional ◽  
Spherical Models

scholarly journals Tectonic plates in 3D mantle convection model with stress- history-dependent rheology

2020 ◽  
Author(s):  
Takehiro Miyagoshi ◽  
Masanori Kameyama ◽  
Masaki Ogawa
Keyword(s):  
Mantle Convection ◽  
Plate Tectonics ◽  
Three Dimensional ◽  
Vertical Component ◽  
Plate Motion ◽  
Stress History ◽  
Tectonic Plates ◽  
Convection Model ◽  
Narrow Plate ◽  
Narrow Bands

Abstract Plate tectonics is a key feature of the dynamics of the Earth’s mantle. By taking into account the stress-history-dependent rheology of mantle materials, we succeeded in realistically producing tectonic plates in our numerical model of mantle convection in a three-dimensional rectangular box. The calculated lithosphere is separated into several pieces (tectonic plates) that rigidly move. Deformation of the lithosphere caused by the relative motion of adjacent plates is concentrated in narrow bands (plate margins) where the viscosity is substantially reduced. The plate margins develop when the stress exceeds a threshold and the lithosphere is ruptured. Once formed, the plate margins persist, even after the stress is reduced below the threshold, allowing the plates to stably move over geologic time. The vertical component of vorticity takes a large value in the narrow plate margins. Secondary convection occurs beneath old tectonic plates as two-dimensional rolls with their axes aligned to the direction of plate motion. The surface heat flow decreases with increasing distance from divergent plate margins (ridges) in their vicinity in the way the cooling half-space model predicts, but it tends towards a constant value away from ridges as observed for the Earth because of the heat transport by the secondary convection.

Towards ready-to-use open source automated geodynamic diagnostics and fair representation of numerical models

2020 ◽  
Author(s):  
Fabio Crameri
Keyword(s):  
Mantle Convection ◽  
State Of The Art ◽  
Numerical Models ◽  
Three Dimensional ◽  
Model Diagnostics ◽  
Model Data ◽  
Geological Processes ◽  
Fair Representation ◽  
Geodynamic Models ◽  
Machine Readable

<p>Advances in numerical modelling of geological processes are based upon, and driven by, diagnosing models. Such model diagnostics are often performed by hand, by eye, or else, by individually written routines that are neither tested or testable, nor reproducible.</p><p>Collecting geodynamic diagnostics, automating them in a robust manner to be applied to the multitude of different geodynamic models and codes, and providing them back to the community can foster additional progress within the modelling community.</p><p>In this presentation, I introduce the latest version of StagLab (Crameri 2018; <strong>www.fabiocrameri.ch/StagLab</strong>; currently version 5.0), which is a growing resource of geodynamic diagnostics, openly available, and easy to use. StagLab works seamlessly with StagYY (Tackley 2008) and can be made compatible with any other mantle convection code, if the respective developers start to provide machine-readable and documented output. Moreover, StagLab represents model data fairly to its users and to the readers of their papers. StagLab allows its users, whether professional or beginner, to produce state-of-the-art post-processing of geodynamic models, and publication-ready figures and movies, in a blink of an eye; all fully tested, testable and reproducible.</p><p> </p><p><em>Crameri (2018), Geodynamic diagnostics, scientific visualisation and StagLab 3.0, Geosci. Model Dev., http://dx.doi.org/10.5194/gmd-11-2541-2018</em></p><p><em>Tackley (2008), Modelling compressible mantle convection with large viscosity contrasts in a three-dimensional spherical shell using the Yin-Yang grid, PEPI, http://dx.doi.org/10.1016/j.pepi.2008.08.005.</em></p>

Three-Dimensional Instabilities of Mantle Convection with Multiple Phase Transitions

Science ◽  
1993 ◽  
Vol 259 (5099) ◽  
pp. 1308-1311 ◽  
Author(s):  
S. Honda ◽  
D. A. Yuen ◽  
S. Balachandar ◽  
D. Reuteler
Keyword(s):  
Phase Transitions ◽  
Mantle Convection ◽  
Three Dimensional ◽  
Multiple Phase
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