Dave A. May
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View article: Quantifying the Influence of Fault Geometry via Mesh Morphing With Applications to Earthquake Dynamic Rupture and Thermal Models of Subduction
Quantifying the Influence of Fault Geometry via Mesh Morphing With Applications to Earthquake Dynamic Rupture and Thermal Models of Subduction Open
Subsurface geometries, such as faults and subducting slab interfaces, are often poorly constrained, yet they exert first‐order control on key geophysical processes, including subduction zone thermal structure and earthquake rupture dynamic…
View article: Syn‐Rift Magmatism and Oceanic Spreading Initiation Controlled by Rift Obliquity: Insights From 3D Coupled Thermo‐Mechanical and Surface Processes Modeling
Syn‐Rift Magmatism and Oceanic Spreading Initiation Controlled by Rift Obliquity: Insights From 3D Coupled Thermo‐Mechanical and Surface Processes Modeling Open
Continental rifting is often oblique, controlled by various inherited weak crustal and mantle heterogeneities striking at non‐orthogonal angles to the direction of extension. Oblique rifting is known to induce strain partitioning and along…
View article: Reduced-order modelling of Cascadia’s slow slip cycles
Reduced-order modelling of Cascadia’s slow slip cycles Open
Slow-slip events (SSEs) modulate the earthquake cycle in subduction zones, yet understanding their physics remains challenging due to sparse observations and high computational cost of physics-based simulations. We present a scientific mac…
View article: Quantifying the influence of fault geometry via mesh morphing with applications to earthquake dynamic rupture and thermal models of subduction
Quantifying the influence of fault geometry via mesh morphing with applications to earthquake dynamic rupture and thermal models of subduction Open
Subsurface geometries are often poorly constrained, yet they exert first-order control on key geophysical processes, including subduction zone thermal structure and earthquake rupture dynamics. Quantifying model sensitivity to geometric va…
View article: Inefficient Melt Transport Across a Weakened Lithosphere Led to Anomalous Rift Architecture in the Turkana Depression
Inefficient Melt Transport Across a Weakened Lithosphere Led to Anomalous Rift Architecture in the Turkana Depression Open
The Turkana Depression, located between the Ethiopian and East African plateaus, displays an anomalous rift architecture. It is missing the narrow, magma‐rich morphology observed in the Main Ethiopian Rift that cuts through the Ethiopian P…
View article: Dual Mechanism Transition Controls Rupture Development of Large Deep Earthquakes
Dual Mechanism Transition Controls Rupture Development of Large Deep Earthquakes Open
Deep earthquakes at depths below 500 km are under prohibitive pressure and temperature conditions for brittle failure. Individual events show diverse rupture behaviors and a coherent mechanism to explain their rupture nucleation, propagati…
View article: 3D Reconstruction of Complex Fault Systems From Volumetric Geodynamic Shear Zones Using Medial Axis Transform
3D Reconstruction of Complex Fault Systems From Volumetric Geodynamic Shear Zones Using Medial Axis Transform Open
Reconstructing fault surfaces from volumetric data is a longstanding challenge in geosciences. We present a novel 3D method based on the medial axis to transform a volumetric strain‐rate invariant field from long‐term geodynamic simulation…
View article: Sensitivity Analysis of the Thermal Structure Within Subduction Zones Using Reduced‐Order Modeling
Sensitivity Analysis of the Thermal Structure Within Subduction Zones Using Reduced‐Order Modeling Open
Megathrust earthquakes are the largest on Earth, capable of causing strong ground shaking and generating tsunamis. Physical models used to understand megathrust earthquake hazard are limited by existing uncertainties about material propert…
View article: Community‐Driven Code Comparisons for Simulations of Fluid‐Induced Aseismic Slip
Community‐Driven Code Comparisons for Simulations of Fluid‐Induced Aseismic Slip Open
Numerical simulations of Sequences of Earthquakes and Aseismic Slip (SEAS) have rapidly progressed to address fundamental problems in fault mechanics and provide self‐consistent, physics‐based frameworks to interpret and predict geophysica…
View article: Modelling the influence of pre-collisional rift linkage during mountain building
Modelling the influence of pre-collisional rift linkage during mountain building Open
It is well documented that many mountain belts, like the Pyrenees, European Alps, Greater Caucasus, or Atlas, form to a large degree by the inversion of pre-collisional extensional basins. Looking at present-day extensional systems, we obs…
View article: Effects of Stress and Friction Heterogeneity on Spatiotemporal Complexity of Seismic and Aseismic Slip on Strike-Slip Faults
Effects of Stress and Friction Heterogeneity on Spatiotemporal Complexity of Seismic and Aseismic Slip on Strike-Slip Faults Open
Numerical and laboratory models of earthquake cycles on faults governed by rate-and-state friction often show cycle-invariant behavior, while natural faults exhibit considerable variability in slip history. Possible explanations include he…
View article: Reduced-order modelling for complex three-dimensional seismic wave propagation
Reduced-order modelling for complex three-dimensional seismic wave propagation Open
SUMMARY Elastodynamic Green’s functions are an essential ingredient in seismology as they form the connection between direct observations of seismic waves and the earthquake source. They are also fundamental to various seismological techni…
View article: Eastern Himalayan syntaxis formation controlled by slab flattening and transient crustal channel flow
Eastern Himalayan syntaxis formation controlled by slab flattening and transient crustal channel flow Open
Plate corners in collisional orogens are often characterised by sharply curving orogenic syntaxis zones, where plate tectonic mountain building processes and surface processes interact vigorously. The formation and evolution of these zones…
View article: Controls of Dynamic and Static Stress Changes and Aseismic Slip on Delayed Earthquake Triggering: Application to the 2019 Ridgecrest Earthquake Sequence
Controls of Dynamic and Static Stress Changes and Aseismic Slip on Delayed Earthquake Triggering: Application to the 2019 Ridgecrest Earthquake Sequence Open
Dynamic earthquake triggering often involves a time delay relative to the peak stress perturbation. In this study, we investigate the physical mechanisms responsible for delayed triggering. We compute detailed spatiotemporal changes in dyn…
View article: Sensitivity Analysis of the Thermal Structure Within Subduction Zones Using Reduced-Order Modeling
Sensitivity Analysis of the Thermal Structure Within Subduction Zones Using Reduced-Order Modeling Open
Megathrust earthquakes are the largest on Earth, capable of causing strong ground shaking and generating tsunamis. Physical models used to understand megathrust earthquake hazard are limited by existing uncertainties about material propert…
View article: PETSc/TAO Users Manual Revision 3.22
PETSc/TAO Users Manual Revision 3.22 Open
This manual describes the use of the Portable, Extensible Toolkit for Scientific Computation (PETSc) and the Toolkit for Advanced Optimization (TAO) for the numerical solution of partial differential equations (PDEs) and related problems o…
View article: Reduced-order modeling for complex 3D seismic wave propagation
Reduced-order modeling for complex 3D seismic wave propagation Open
Elastodynamic Green's functions are an essential ingredient in seismology as they form the connection between direct observations of seismic waves and the earthquake source. They are also fundamental to various seismological techniques inc…
View article: Coupling 3D geodynamics and dynamic earthquake rupture: fault geometry, rheology and stresses across timescales
Coupling 3D geodynamics and dynamic earthquake rupture: fault geometry, rheology and stresses across timescales Open
Tectonic deformation crucially shapes the Earth's surface, with strain localization resulting in the formation of shear zones and faults that accommodate significant tectonic displacement. Earthquake dynamic rupture models, which provide v…
View article: Generalisation of the Navier-slip boundary condition to arbitrary directions: Application to 3D oblique geodynamic simulations
Generalisation of the Navier-slip boundary condition to arbitrary directions: Application to 3D oblique geodynamic simulations Open
Although boundary conditions are mandatory to solve partial differential equations, they also represent a transfer of information between the domain being modelled and its surroundings. In the case of isolated or closed systems, these can …
View article: PETSc/TAO Users Manual V.3.21
PETSc/TAO Users Manual V.3.21 Open
This manual describes the use of the Portable, Extensible Toolkit for Scientific Computation (PETSc) and the Toolkit for Advanced Optimization (TAO) for the numerical solution of partial differential equations (PDEs) and related problems o…
View article: Competing effects of crustal shortening, thermal inheritance, and surface processes explain subsidence anomalies in inverted rift basins
Competing effects of crustal shortening, thermal inheritance, and surface processes explain subsidence anomalies in inverted rift basins Open
Structural inversion of rifted basins is generally associated with surface uplift and denudation of the sedimentary infill, reflecting the active contractional deformation in the crust. However, worldwide examples of inverted rifts show co…
View article: Characterization of a 5-nozzle array using premix/micromix injection for hydrogen
Characterization of a 5-nozzle array using premix/micromix injection for hydrogen Open
Hydrogen is one of the most promising fuels to decarbonize energy systems since it has a high specific energy, a carbon-free combustion process, and may be produced sustainably through electrolysis. Direct fuel drop-in replacement cannot b…
View article: Interaction of tectonics and surface process during oblique rifted margin formation. Insights from 3-D forward coupled geodynamic-surface process modelling.
Interaction of tectonics and surface process during oblique rifted margin formation. Insights from 3-D forward coupled geodynamic-surface process modelling. Open
The magma-poor passive rifted conjugate margins in the Southern Equatorial Atlantic, North Atlantic/Arctic oceans, and Northern Mozambique Channel display en-echelon extensional segments separated by long transform faults (>300 km), influe…
View article: One-way linking of 3D long-term geodynamic models and short-term earthquake dynamic rupture models
One-way linking of 3D long-term geodynamic models and short-term earthquake dynamic rupture models Open
Tectonic deformation plays a crucial role in shaping the Earth's surface, with strain localization resulting in the formation of shear zones in depth and faults on the surface. These structures accommodate a significant portion of the disp…
View article: Reduced magmatism in the Turkana Depression: a consequence of inefficient melt transport
Reduced magmatism in the Turkana Depression: a consequence of inefficient melt transport Open
Geophysical studies along the Main Ethiopian Rift and Eastern Rift in Kenya indicate that strain accommodation is dominated by magmatic intrusion rather than tectonic extension (e.g., Ebinger and Casey, 2001). However, it remains unclear h…
View article: Stress, strain and crustal flow patterns in a corner collision: insights from coupled 3D numerical models
Stress, strain and crustal flow patterns in a corner collision: insights from coupled 3D numerical models Open
Large and fast collisional systems such as the Eastern Tibetan-Himalayan orogenic system can have distinct corner structures. Away from the corners, plate convergence is accommodated primarily by convergence-parallel processes such as (con…
View article: On the causes of melt focusing at mid-ocean ridges: Ridge suction versus permeability barrier
On the causes of melt focusing at mid-ocean ridges: Ridge suction versus permeability barrier Open
Emplacement of magmatic crust at mid-ocean ridges (MORs) is confined in a narrow neovolcanic zone on the seafloor, whereas geophysical observations suggest that mantle melting occurs over a broad region. How melt is transported horizontall…
View article: A Three‐Field Formulation for Two‐Phase Flow in Geodynamic Modeling: Toward the Zero‐Porosity Limit
A Three‐Field Formulation for Two‐Phase Flow in Geodynamic Modeling: Toward the Zero‐Porosity Limit Open
Two‐phase flow, a system where Stokes flow and Darcy flow are coupled, is of great importance in the Earth's interior, such as in subduction zones, mid‐ocean ridges, and hotspots. However, it remains challenging to solve the two‐phase equa…