Alistair Boyce
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View article: Craton Formation by Underplating and Development of the MLD: Evidence from Bayesian Surface Wave Inversion 
Craton Formation by Underplating and Development of the MLD: Evidence from Bayesian Surface Wave Inversion  Open
Craton formation and evolution remains enigmatic because observations from long and short period seismic waves and geochemical data are inconsistent. For example, both internal layering and radial anisotropy are poorly constrained. By inve…
View article: Seismic Evidence for Craton Formation by Underplating and Development of the MLD
Seismic Evidence for Craton Formation by Underplating and Development of the MLD Open
Inconsistencies between observations from long and short period seismic waves and geochemical data mean craton formation and evolution remains enigmatic. Specifically, internal layering and radial anisotropy are poorly constrained. Here, w…
View article: Craton Radial Anisotropy and Low Velocity Zones imaged with Bayesian and LSQR methods
Craton Radial Anisotropy and Low Velocity Zones imaged with Bayesian and LSQR methods Open
******************** README for Rad_anisotropy_BOYCE_GRL ***************************** This repository contains data files, inversion software, outputs and plotting codes to accompany the following submitted manuscript: Boyce, A., Bodin, T…
View article: Craton Radial Anisotropy and Low Velocity Zones imaged with Bayesian and LSQR methods
Craton Radial Anisotropy and Low Velocity Zones imaged with Bayesian and LSQR methods Open
******************** README for Rad_anisotropy_BOYCE_GRL ***************************** This repository contains data files, inversion software, outputs and plotting codes to accompany the following submitted manuscript: Boyce, A., Bodin, T…
View article: Mantle Wavespeed and Discontinuity Structure Below East Africa: Implications for Cenozoic Hotspot Tectonism and the Development of the Turkana Depression
Mantle Wavespeed and Discontinuity Structure Below East Africa: Implications for Cenozoic Hotspot Tectonism and the Development of the Turkana Depression Open
Ethiopia's Cenozoic flood basalt magmatism, uplift, and rifting have been attributed to one or more mantle plumes. The Nubian plate, however, has drifted 500–1,000 km north since initial magmatism at ∼45 Ma, having developed above mantle t…
View article: Multigenetic Origin of the X‐Discontinuity Below Continents: Insights From African Receiver Functions
Multigenetic Origin of the X‐Discontinuity Below Continents: Insights From African Receiver Functions Open
Constraints on chemical heterogeneities in the upper mantle may be derived from studying the seismically observable impedance contrasts that they produce. Away from subduction zones, several causal mechanisms are possible to explain the in…
View article: A New P‐Wave Tomographic Model (CAP22) for North America: Implications for the Subduction and Cratonic Metasomatic Modification History of Western Canada and Alaska
A New P‐Wave Tomographic Model (CAP22) for North America: Implications for the Subduction and Cratonic Metasomatic Modification History of Western Canada and Alaska Open
Our understanding of the present‐day state and evolution of the Canadian and Alaskan mantle is hindered by a lack of absolute P‐wavespeed constraints that provide complementary sensitivity to composition in conjunction with existing S‐wave…
View article: CAP22 Tomographic model: Data, Software, Plotting
CAP22 Tomographic model: Data, Software, Plotting Open
CAP22 (Boyce et al., 2023), is an absolute P-wavespeed tomographic model with focus on North American, specifically Canadian and Alaskan, mantle structure, provided with and without crustal correction. Please cite the following work when u…
View article: CAP22 Tomographic model: Data, Software, Plotting
CAP22 Tomographic model: Data, Software, Plotting Open
CAP22 (Boyce et al., 2023), is an absolute P-wavespeed tomographic model with focus on North American, specifically Canadian and Alaskan, mantle structure, provided with and without crustal correction. Please cite the following work when u…
View article: AFRP22 Tomographic Model & MTZ Receiver Functions: Data, Software, Plotting
AFRP22 Tomographic Model & MTZ Receiver Functions: Data, Software, Plotting Open
AFRP22 (Boyce et al., 2023), is an adaptively parameterized, absolute P-wave tomographic model for Africa provided with and without crustal correction. Also provided is mantle transition zone Receiver Functions for new stations in the Turk…
View article: AFRP22 Tomographic Model & MTZ Receiver Functions: Data, Software, Plotting
AFRP22 Tomographic Model & MTZ Receiver Functions: Data, Software, Plotting Open
AFRP22 (Boyce et al., 2023), is an adaptively parameterized, absolute P-wave tomographic model for Africa provided with and without crustal correction. Also provided is mantle transition zone Receiver Functions for new stations in the Turk…
View article: The X-discontinuity as a Tracer for Chemical Heterogeneity: Observations from East Africa
The X-discontinuity as a Tracer for Chemical Heterogeneity: Observations from East Africa Open
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]The X-discontinuity as a Tracer for Chemical Heterogeneity: Observations from East AfricaAuthorsStephenPughiDAlistairBoyceiDIanBastowiD…
View article: The Mantle Seismic Structure below Canada and Alaska Constrained by a New Absolute P-wavespeed Tomographic Model
The Mantle Seismic Structure below Canada and Alaska Constrained by a New Absolute P-wavespeed Tomographic Model Open
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]The Mantle Seismic Structure below Canada and Alaska Constrained by a New Absolute P-wavespeed Tomographic ModelAuthorsMitchLiddelliDAl…
View article: Constraints on the Mantle Wavespeed and Discontinuity Structure below the Turkana Depression, East Africa: Insights into Topographic Development and Ethiopian Flood Basalt Volcanism
Constraints on the Mantle Wavespeed and Discontinuity Structure below the Turkana Depression, East Africa: Insights into Topographic Development and Ethiopian Flood Basalt Volcanism Open
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v2]Constraints on the Mantle Wavespeed and Discontinuity Structure below the Turkana Depression, East Africa: Insights into Topographic De…
View article: Constraints on the Mantle Wavespeed and Discontinuity Structure below the Turkana Depression, East Africa: Insights into Topographic Development and Ethiopian Flood Basalt Volcanism
Constraints on the Mantle Wavespeed and Discontinuity Structure below the Turkana Depression, East Africa: Insights into Topographic Development and Ethiopian Flood Basalt Volcanism Open
Earth and Space Science Open Archive PosterOpen AccessYou are viewing an older version [v1]Go to new versionConstraints on the Mantle Wavespeed and Discontinuity Structure below the Turkana Depression, East Africa: Insights into Topographi…
View article: Insights Into Deep Mantle Thermochemical Contributions to African Magmatism From Converted Seismic Phases
Insights Into Deep Mantle Thermochemical Contributions to African Magmatism From Converted Seismic Phases Open
The contribution of mantle upwellings of varying spatial extent to Cenozoic magmatism across Africa is debated because geochemical and seismological tools used to interrogate them are primarily sensitive to either composition or temperatur…
View article: Global receiver function observations of the X-discontinuity reveal recycled basalt beneath hotspots
Global receiver function observations of the X-discontinuity reveal recycled basalt beneath hotspots Open
The distribution of chemical heterogeneity beneath hotspots provides important constraints on the source of magmatism and mantle convection. Chemical heterogeneities in the upper mantle produce discontinuities that can be interrogated seis…
View article: AFRP20: New <i>P</i>‐Wavespeed Model for the African Mantle Reveals Two Whole‐Mantle Plumes Below East Africa and Neoproterozoic Modification of the Tanzania Craton
AFRP20: New <i>P</i>‐Wavespeed Model for the African Mantle Reveals Two Whole‐Mantle Plumes Below East Africa and Neoproterozoic Modification of the Tanzania Craton Open
Africa's Cenozoic tectonism is often attributed to mantle plumes, particularly below East Africa, but their morphology, number, location, and impact on the African lithosphere are debated. The broad slow wavespeed African Superplume, ubiqu…
View article: The Proterozoic building of North America: insights from broadband seismic tomography
The Proterozoic building of North America: insights from broadband seismic tomography Open
Cratons, the Archean (≥ 2.5 Ga) cores of the continents are the longest-lived features of Earth’s surface. They are underlain by cold, iron-depleted, thick (>250 km), seismically fast lithospheric mantle roots or keels that have survived t…
View article: From Relative to Absolute Teleseismic Travel Times: The Absolute Arrival‐Time Recovery Method (AARM)
From Relative to Absolute Teleseismic Travel Times: The Absolute Arrival‐Time Recovery Method (AARM) Open
Dense, short‐term deployments of seismograph networks are frequently used to study upper‐mantle structure. However, recordings of variably emergent teleseismic waveforms are often of lower signal‐to‐noise ratio (SNR) than those recorded at…
View article: Peering beneath the Canadian crust
Peering beneath the Canadian crust Open
Amy Gilligan and researchers from the UK, Canada and the US take a deep look at the North American craton.
View article: Subduction beneath Laurentia modified the eastern North American cratonic edge: Evidence from <i>P</i> wave and <i>S</i> wave tomography
Subduction beneath Laurentia modified the eastern North American cratonic edge: Evidence from <i>P</i> wave and <i>S</i> wave tomography Open
The cratonic cores of the continents are remarkably stable and long‐lived features. Their ability to resist destructive tectonic processes is associated with their thick (∼250 km), cold, chemically depleted, buoyant lithospheric keels that…
View article: Lithospheric deformation in the Canadian Appalachians: evidence from shear wave splitting
Lithospheric deformation in the Canadian Appalachians: evidence from shear wave splitting Open
Plate-scale deformation is expected to impart seismic anisotropic fabrics on the lithosphere. Determination of the fast shear wave orientation (ϕ) and the delay time between the fast and slow split shear waves (δt) via SKS splitting can he…