Robert Myhill
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View article: A method for the prediction of seismic discontinuity topography from thermochemical mantle circulation models
A method for the prediction of seismic discontinuity topography from thermochemical mantle circulation models Open
SUMMARY We demonstrate a method for the prediction of seismic discontinuity topography from thermochemical Mantle Circulation Models (MCMs). We find the discontinuity depth by using the peak reflectivity at each location in our mantle tran…
View article: A Method for the Prediction of Seismic Discontinuity Topography from Thermochemical Mantle Circulation Models
A Method for the Prediction of Seismic Discontinuity Topography from Thermochemical Mantle Circulation Models Open
We demonstrate a method for the prediction of seismic discontinuity topography from thermochemical Mantle Circulation Models (MCMs). We find the discontinuity depth by using the peak reflectivity at each location in our mid-mantle, taking …
View article: Reply to comment by T. Ruedas on ‘The SPOCK Equation of State for condensed phases under arbitrary compression’
Reply to comment by T. Ruedas on ‘The SPOCK Equation of State for condensed phases under arbitrary compression’ Open
SUMMARY A brief reply to the comment by Ruedas.
View article: How to assess similarities and differences between mantle circulation models and Earth using disparate independent observations
How to assess similarities and differences between mantle circulation models and Earth using disparate independent observations Open
Mantle circulation in the Earth acts to remove heat from its interior and is thus a critical driver of our planet’s internal and surface evolution. Numerical mantle circulation models (MCMs) driven by plate motion history allow us to model…
View article: On the global geodynamic consequences of different phase boundary morphologies
On the global geodynamic consequences of different phase boundary morphologies Open
Phase transitions can influence mantle convection patterns, inhibiting or promoting vertical flow. One such transition is the ringwoodite-to-bridgmanite plus periclase transition, which has a negative Clapeyron slope and therefore reduces …
View article: ASPECT 3.0: The Advanced Solver for Planetary Evolution, Convection, and Tectonics
ASPECT 3.0: The Advanced Solver for Planetary Evolution, Convection, and Tectonics Open
Modern geodynamic models have become increasingly complex, coupling detailed numerical approximations to many physical processes with large observational datasets. This coupling creates unique challenges for modern research software such a…
View article: Modelling Grain Size Evolution and its Role in Mantle Dynamics: From Small-scale Convection to Passive Margin Collapse
Modelling Grain Size Evolution and its Role in Mantle Dynamics: From Small-scale Convection to Passive Margin Collapse Open
Dynamic models of Earth's lithosphere and convecting mantle often simplify the rheological behavior of mantle rocks, for example by assuming constant grain size or considering limited changes in material properties with mineral assemblage.…
View article: How Phase Transitions Impact Changes in Mantle Convection Style Throughout Earth’s History: From Stalled Plumes to Surface Dynamics
How Phase Transitions Impact Changes in Mantle Convection Style Throughout Earth’s History: From Stalled Plumes to Surface Dynamics Open
Mineral phase transitions can either hinder or accelerate mantle flow. In the present day Earth, the formation of the bridgmanite + ferropericlase assemblage from ringwoodite at 660 km depth has been found to cause weak and intermittent la…
View article: Chemical potentials in non-hydrostatically stressed anisotropic phases
Chemical potentials in non-hydrostatically stressed anisotropic phases Open
SUMMARY Chemical potentials can be defined as the partial derivatives of the Helmholtz energy with respect to moles of chemical components under conditions of zero domain strain and fixed temperature. Under hydrostatic conditions, chemical…
View article: The SPOCK equation of state for condensed phases under arbitrary compression
The SPOCK equation of state for condensed phases under arbitrary compression Open
SUMMARY This short paper presents a new equation of state for condensed phases. The equation of state is built on the premise that $K^{\prime }$, the first derivative of the bulk modulus, monotonically increases with volume according to a …
View article: A model of elastic softening and displacive phase transitions in anisotropic phases, with application to stishovite and post-stishovite
A model of elastic softening and displacive phase transitions in anisotropic phases, with application to stishovite and post-stishovite Open
SUMMARY This paper introduces a comprehensive framework for modelling both instantaneous and time-dependent elastic softening in anisotropic materials at high pressure and temperature. This framework employs Landau Theory, minimizing the H…
View article: On the global geodynamic consequences of different phase boundary morphologies
On the global geodynamic consequences of different phase boundary morphologies Open
Phase transitions can influence mantle convection patterns, inhibiting or promoting vertical flow. One such transition is the ringwoodite-to-bridgmanite plus periclase transition, which has a negative Clapeyron slope and therefore reduces …
View article: An anisotropic equation of state for solid solutions, with application to plagioclase
An anisotropic equation of state for solid solutions, with application to plagioclase Open
SUMMARY This paper presents a framework for building anisotropic equations of state for solid solutions. The framework satisfies the connections between elastic and thermodynamic properties required by Maxwell’s relations. It builds on a r…
View article: Unique composition and evolutionary histories of low velocity mantle domains
Unique composition and evolutionary histories of low velocity mantle domains Open
The two `large low velocity provinces' (LLVPs) are broad seismic wave speed anomalies in Earth's lower mantle beneath Africa and the Pacific Ocean. Recent research suggests they represent volumes that contain relatively dense subducted oce…
View article: The emerging picture of a complex core-mantle boundary
The emerging picture of a complex core-mantle boundary Open
Recent seismological studies challenge the traditional view that the interface between the core and mantle is a straightforward discontinuity. As seismology is pushed to its observational limits, a complex - potentially compositionally lay…
View article: An anisotropic equation of state for solid solutions, with application to plagioclase
An anisotropic equation of state for solid solutions, with application to plagioclase Open
This paper presents a framework for building anisotropic equations of state for solid solutions. The framework satisfies the connections between elastic and thermodynamic properties required by Maxwell’s reciprocal relations. It buil…
View article: Chemical potentials in non-hydrostatically stressed anisotropic phases
Chemical potentials in non-hydrostatically stressed anisotropic phases Open
This paper presents expressions for chemical potentials in non-hydrostatically stressed anisotropic phases. Chemical potentials are here defined as the change in Helmholtz energy on adding a single chemical component to a material while lo…
View article: A model of elastic softening and second order phase transitions in anisotropic phases, with application to stishovite and post-stishovite
A model of elastic softening and second order phase transitions in anisotropic phases, with application to stishovite and post-stishovite Open
This paper presents a Landau framework for describing instantaneous and time-dependent elastic softening in anisotropic solid solutions. As with previous Landau models, the framework minimizes a thermodynamic potential by varying isochemic…
View article: BurnMan – a Python toolkit for planetary geophysics,geochemistry and thermodynamics
BurnMan – a Python toolkit for planetary geophysics,geochemistry and thermodynamics Open
Many branches of physics, chemistry and Earth sciences build complex materials from simpler constructs: rocks are composites made up of one or more phases; phases are solutions of more than one endmember; and endmembers are usually mixture…
View article: The Stability of Dense Oceanic Crust Near the Core‐Mantle Boundary
The Stability of Dense Oceanic Crust Near the Core‐Mantle Boundary Open
The large low‐shear‐velocity provinces (LLSVPs) are thought to be thermo‐chemical in nature, with recycled oceanic crust (OC) being a contender for the source of the chemical heterogeneity. The melting process which forms OC concentrates h…
View article: Seismic detection of a deep mantle discontinuity within Mars by InSight
Seismic detection of a deep mantle discontinuity within Mars by InSight Open
Constraining the thermal and compositional state of the mantle is crucial for deciphering the formation and evolution of Mars. Mineral physics predicts that Mars’ deep mantle is demarcated by a seismic discontinuity arising from the pressu…
View article: Monsters of rock: are Uranus and Neptune rock giants?
Monsters of rock: are Uranus and Neptune rock giants? Open
<p><strong>Introduction</strong></p> <p>To understand solar system formation it is critical to know how Uranus and Neptune formed. This requires knowledge of internal composition. Uranus and Neptune are genera…
View article: An anisotropic equation of state for high-pressure, high-temperature applications
An anisotropic equation of state for high-pressure, high-temperature applications Open
SUMMARY This paper presents a strategy for extending scalar (P–V–T) equations of state to self-consistently model anisotropic materials over a wide range of pressures and temperatures under nearly hydrostatic conditions. The method involve…
View article: Towards waveform seismic filtering of mantle convection models
Towards waveform seismic filtering of mantle convection models Open
<p>Earth science has been heavily data-driven due to the abundance in data. Yet, when there are relatively a small number of hypotheses to verify, the inverse problem becomes a classification problem. It is then worth directly examin…
View article: Geometry and Segmentation of Cerberus Fossae, Mars: Implications for Marsquake Properties
Geometry and Segmentation of Cerberus Fossae, Mars: Implications for Marsquake Properties Open
The NASA InSight mission to Mars successfully landed on 26 November 2018 in Elysium Planitia. It aims to characterize the seismic activity and aid in the understanding of the internal structure of Mars. We focus on the Cerberus Fossae regi…
View article: Geometry and segmentation of Cerberus Fossae, Mars: implications for marsquake properties.
Geometry and segmentation of Cerberus Fossae, Mars: implications for marsquake properties. Open
The dataset is made of three different files: - Perrin-et-al-Calculated-DEMs.zip : we use HiRISE stereo pair images (https://www.uahirise.org/) to compute high-resolution DEMs along the Cerberus Fossae system using the SOCET SET mapping so…
View article: Geometry and segmentation of Cerberus Fossae, Mars: implications for marsquake properties.
Geometry and segmentation of Cerberus Fossae, Mars: implications for marsquake properties. Open
The dataset is made of three different files: - Perrin-et-al-Calculated-DEMs.zip : we use HiRISE stereo pair images (https://www.uahirise.org/) to compute high-resolution DEMs along the Cerberus Fossae system using the SOCET SET mapping so…