Martyn Unsworth
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View article: The Influence of 3‐D Earth Conductivity, Geoelectric Field Polarization, and Power Grid Topology on GIC Risk
The Influence of 3‐D Earth Conductivity, Geoelectric Field Polarization, and Power Grid Topology on GIC Risk Open
Geomagnetically induced currents (GICs) are naturally occurring electrical currents that flow through the Earth and long conductive infrastructure, such as power lines, during geomagnetic storms. GICs in the electric power grid can cause d…
View article: Multiphysics inversion with variable complexity of receiver-function, surface-wave dispersion and magnetotelluric data reduces uncertainty for lithosphere structure
Multiphysics inversion with variable complexity of receiver-function, surface-wave dispersion and magnetotelluric data reduces uncertainty for lithosphere structure Open
We present a probabilistic multiphysics inversion based on Bayesian inference with trans-dimensional models. We jointly consider magnetotelluric, receiver function, and Rayleigh-wave dispersion data to infer one-dimensional lithospheric st…
View article: Updated 3D resistivity model of the Tres Vírgenes geothermal field (Mexico) from magnetotelluric data: Implications for geothermal exploration and development
Updated 3D resistivity model of the Tres Vírgenes geothermal field (Mexico) from magnetotelluric data: Implications for geothermal exploration and development Open
View article: Combining magnetotelluric, DC resistivity, and time-domain electromagnetic data in geothermal exploration: An example from the M’Deek Geothermal Field in Western British Columbia, Canada
Combining magnetotelluric, DC resistivity, and time-domain electromagnetic data in geothermal exploration: An example from the M’Deek Geothermal Field in Western British Columbia, Canada Open
View article: A Tale of Two Kimberlite Fields: the contrasting resistivity structure beneath northern Alberta kimberlites and tectonic implications from magnetotellurics
A Tale of Two Kimberlite Fields: the contrasting resistivity structure beneath northern Alberta kimberlites and tectonic implications from magnetotellurics Open
View article: Long‐Term Peak Geoelectric Field Behavior for Space Weather Hazard Assessment in Alberta, Canada Using Geomagnetic and Magnetotelluric Measurements
Long‐Term Peak Geoelectric Field Behavior for Space Weather Hazard Assessment in Alberta, Canada Using Geomagnetic and Magnetotelluric Measurements Open
To better understand the risks of space weather to electric power transmission networks, magnetometer data and nearby magnetotelluric impedance data at four sites in Alberta, Canada are used to estimate the induced geoelectric field over t…
View article: Integrating Gravity, Magnetic, and Magnetotelluric Data Over Devon Ice Cap, Canadian Arctic, to Investigate the Subglacial Geology
Integrating Gravity, Magnetic, and Magnetotelluric Data Over Devon Ice Cap, Canadian Arctic, to Investigate the Subglacial Geology Open
The subglacial geology beneath Devon Ice Cap (DIC) is not well understood. An airborne radar study published in 2018 suggested the presence of a hypersaline, subglacial lake beneath DIC where geologic modeling suggested that the source of …
View article: Combining Magnetotelluric, Dc Resistivity, and Time-Domain Electromagnetic Data in Geothermal Exploration: An Example from the M’Deek Geothermal Field in Western British Columbia, Canada
Combining Magnetotelluric, Dc Resistivity, and Time-Domain Electromagnetic Data in Geothermal Exploration: An Example from the M’Deek Geothermal Field in Western British Columbia, Canada Open
View article: Contribution of 2-D and 3-D magnetotelluric models to understand the tectonic evolution of the Dom Feliciano Belt and adjacent basins, southern Brazil and northeastern Uruguay
Contribution of 2-D and 3-D magnetotelluric models to understand the tectonic evolution of the Dom Feliciano Belt and adjacent basins, southern Brazil and northeastern Uruguay Open
View article: Magnetotelluric evidence for the formation of the layered Sask Craton by flat slab subduction
Magnetotelluric evidence for the formation of the layered Sask Craton by flat slab subduction Open
View article: Misidentified subglacial lake beneath the Devon Ice Cap, Canadian Arctic: a new interpretation from seismic and electromagnetic data
Misidentified subglacial lake beneath the Devon Ice Cap, Canadian Arctic: a new interpretation from seismic and electromagnetic data Open
In 2018 the first subglacial lake in the Canadian Arctic was proposed to exist beneath the Devon Ice Cap, based on the analysis of airborne radar data. Here, we report a new interpretation of the subglacial material beneath the Devon Ice C…
View article: Using a Differential Magnetometer Technique to Measure Geomagnetically Induced Currents: An Augmented Approach
Using a Differential Magnetometer Technique to Measure Geomagnetically Induced Currents: An Augmented Approach Open
Geoelectric fields produced by time‐varying magnetic fields during geomagnetic storms can result in potentially damaging geomagnetically induced currents (GICs) in long conductors at the Earth's surface. GICs can pose a significant risk to…
View article: Canada’s Geothermal Energy Update in 2023
Canada’s Geothermal Energy Update in 2023 Open
Geothermal energy exploration, development, and research have been ongoing in Canada for several decades. The country’s cold climate and the push to develop renewable energy sources have driven interest in geothermal energy. Despite this d…
View article: Modeling Geomagnetically Induced Currents in the Alberta Power Network: Comparison and Validation Using Hall Probe Measurements During a Magnetic Storm
Modeling Geomagnetically Induced Currents in the Alberta Power Network: Comparison and Validation Using Hall Probe Measurements During a Magnetic Storm Open
During space weather events, geomagnetic disturbances (GMDs) induce geoelectric fields which drive geomagnetically induced currents (GICs) through electrically‐grounded power transmission lines. Alberta, Canada—located near the auroral zon…
View article: Supplemental Material: Crustal structure of the Lazufre volcanic complex and the Southern Puna from 3-D inversion of magnetotelluric data: Im-plications for surface uplift and evidence for melt storage and hydrothermal fluids
Supplemental Material: Crustal structure of the Lazufre volcanic complex and the Southern Puna from 3-D inversion of magnetotelluric data: Im-plications for surface uplift and evidence for melt storage and hydrothermal fluids Open
Additional details of the magnetotelluric data and resulting 3-D resistivity models.
View article: Misidentified subglacial lake beneath the Devon Ice Cap, Canadian Arctic: A new interpretation from seismic and electromagnetic data
Misidentified subglacial lake beneath the Devon Ice Cap, Canadian Arctic: A new interpretation from seismic and electromagnetic data Open
In 2018 the first subglacial lake in the Canadian Artic was proposed to exist beneath Devon Ice cap, based on the analysis of airborne radar data. Here, we report a new interpretation of the subglacial material beneath Devon Ice Cap, suppo…
View article: Locating Active Faults in the Cusco Valley Using Magnetotelluric and Radon Gas Data
Locating Active Faults in the Cusco Valley Using Magnetotelluric and Radon Gas Data Open
View article: Crustal structure of the Lazufre volcanic complex and the Southern Puna from 3-D inversion of magnetotelluric data: Implications for surface uplift and evidence for melt storage and hydrothermal fluids
Crustal structure of the Lazufre volcanic complex and the Southern Puna from 3-D inversion of magnetotelluric data: Implications for surface uplift and evidence for melt storage and hydrothermal fluids Open
The Central Andes are unique in the global system of subduction zones in that a significant, high-altitude plateau has formed above a subduction zone. In this region, both subduction and the associated magmatism have been shown to vary in …
View article: Magnetotelluric Imaging of the Lithospheric Structure of the Southern Oklahoma Aulacogen: Evidence for Long‐Term Weakening Caused by Rifting
Magnetotelluric Imaging of the Lithospheric Structure of the Southern Oklahoma Aulacogen: Evidence for Long‐Term Weakening Caused by Rifting Open
Magnetotelluric data were used to study the lithosphere structure of the Southern Oklahoma Aulacogen (SOA). Inversion of the data revealed two low resistivity anomalies beneath the SOA. The first is located in the depth range 0–90 km in th…
View article: Supplemental Material: Crustal structure of the Lazufre volcanic complex and the Southern Puna from 3-D inversion of magnetotelluric data: Im-plications for surface uplift and evidence for melt storage and hydrothermal fluids
Supplemental Material: Crustal structure of the Lazufre volcanic complex and the Southern Puna from 3-D inversion of magnetotelluric data: Im-plications for surface uplift and evidence for melt storage and hydrothermal fluids Open
Additional details of the magnetotelluric data and resulting 3-D resistivity models.
View article: Supplemental Material: Crustal structure of the Lazufre volcanic complex and the Southern Puna from 3-D inversion of magnetotelluric data: Im-plications for surface uplift and evidence for melt storage and hydrothermal fluids
Supplemental Material: Crustal structure of the Lazufre volcanic complex and the Southern Puna from 3-D inversion of magnetotelluric data: Im-plications for surface uplift and evidence for melt storage and hydrothermal fluids Open
Additional details of the magnetotelluric data and resulting 3-D resistivity models.
View article: Caracterización magnetotelúrica de las fallas y sistema de fallas en el valle del Cusco, sur del Perú
Caracterización magnetotelúrica de las fallas y sistema de fallas en el valle del Cusco, sur del Perú Open
En este estudio, se presenta los resultados obtenidos de la investigación magnetotelúrica (MT) llevada a cabo en abril de 2018 en las principales fallas y sistemas de fallas identificados a lo largo del valle del Cusco, sur del Perú. El pe…
View article: Multi-technique surface geophysical surveys over Devon Ice Cap, Canadian Arctic
Multi-technique surface geophysical surveys over Devon Ice Cap, Canadian Arctic Open
This dataset was acquired during a multi-technique surface geophysical campaign in May 2022 over Devon Ice Cap, Canadian Arctic. Description of data: Seismic 9 km of active source seismic reflection data r…
View article: Multi-technique surface geophysical surveys over Devon Ice Cap, Canadian Arctic
Multi-technique surface geophysical surveys over Devon Ice Cap, Canadian Arctic Open
This dataset was acquired during a multi-technique surface geophysical campaign in May 2022 over Devon Ice Cap, Canadian Arctic. Description of data: Seismic 9 km of active source seismic reflection data r…
View article: Trans-crustal structural control of CO2-rich extensional magmatic systems revealed at Mount Erebus Antarctica
Trans-crustal structural control of CO2-rich extensional magmatic systems revealed at Mount Erebus Antarctica Open
View article: Mechanism for the Uplift of Gongga Shan in the Southeastern Tibetan Plateau Constrained by 3D Magnetotelluric Data
Mechanism for the Uplift of Gongga Shan in the Southeastern Tibetan Plateau Constrained by 3D Magnetotelluric Data Open
Gongga Shan (GGS) is the highest mountain on the eastern margin of the Tibetan Plateau. However, the mechanism for the uplift of Gongga Shan is still unclear due to a lack of detailed geophysical studies. Inversion of an array of magnetote…
View article: Mechanism for the Uplift of Gongga Shan in the Southeastern Tibetan Plateau Constrained by 3D Magnetotelluric Data
Mechanism for the Uplift of Gongga Shan in the Southeastern Tibetan Plateau Constrained by 3D Magnetotelluric Data Open
The *.data, *.rho, and *.zip files are associated with a paper titled 'Mechanism for the Uplift of Gongga Shan in the Southeastern Tibetan Plateau Constrained by 3D Magnetotelluric Data' in Geophysical Research Letters published in 2022. O…
View article: Mechanism for the Uplift of Gongga Shan in the Southeastern Tibetan Plateau Constrained by 3D Magnetotelluric Data
Mechanism for the Uplift of Gongga Shan in the Southeastern Tibetan Plateau Constrained by 3D Magnetotelluric Data Open
The *.data, *.rho, and *.zip files are associated with a paper titled 'Mechanism for the Uplift of Gongga Shan in the Southeastern Tibetan Plateau Constrained by 3D Magnetotelluric Data' in Geophysical Research Letters published in 2022. O…
View article: Estimating the Geoelectric Field, Transmission Line Voltages, and GICs During a Geomagnetic Storm in Alberta, Canada
Estimating the Geoelectric Field, Transmission Line Voltages, and GICs During a Geomagnetic Storm in Alberta, Canada Open
<p>Estimating the effect of geomagnetic disturbances on infrastructure is an important problem since they can induce damaging currents in electric power transmission lines. In this study, an array of magnetotelluric (MT) impedance me…
View article: A 3-D, Technicolor Zombie: Joint Analysis of Multidisciplinary Geophysical and Geochemical Data at Uturuncu Volcano, Bolivia Reveals Active Hydrothermal System and Possible Sulfide Deposition
A 3-D, Technicolor Zombie: Joint Analysis of Multidisciplinary Geophysical and Geochemical Data at Uturuncu Volcano, Bolivia Reveals Active Hydrothermal System and Possible Sulfide Deposition Open
Uturuncu volcano in southern Bolivia is a member of a distinctive class of volcanoes – systems that show unrest despite not having erupted in the Holocene. Uturuncu has not erupted in 250 kyr, but has been deforming (uplift with a moat of …