A5039096193- Geophysical and Geoelectrical Methods
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geological and Geophysical Studies
- Seismic Waves and Analysis
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Seismic Imaging and Inversion Techniques
- Geomagnetism and Paleomagnetism Studies
- Geophysical Methods and Applications
- Geological Studies and Exploration
- Cryospheric studies and observations
- Geophysics and Gravity Measurements
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Hydrocarbon exploration and reservoir analysis
- Earthquake Detection and Analysis
- Reservoir Engineering and Simulation Methods
- Methane Hydrates and Related Phenomena
- Seismology and Earthquake Studies
- Characterization and Applications of Magnetic Nanoparticles
- Climate change and permafrost
- Climate variability and models
- Winter Sports Injuries and Performance
- Meteorological Phenomena and Simulations
University of Oslo
2016-2024
Macquarie University
2017-2024
University of Tasmania
2023-2024
University of South Australia
2021-2023
University of California System
2022
ARC Centre of Excellence for Core to Crust Fluid Systems
2020-2022
Australian Research Council
2021
The University of Adelaide
2006-2016
Lamont-Doherty Earth Observatory
2015
Columbia University
2015
The Transantarctic Mountains (TAM) are the world's longest rift shoulder but source of their high elevation is enigmatic. To discriminate importance mechanical vs. thermal sources support, a 550 km-long transect magnetotelluric geophysical soundings spanning central TAM was acquired. These data reveal lithosphere electrical resistivity to at least 150 km depth, implying cold stable state well into upper mantle. Here we find that most likely elevated by non-thermal, flexural cantilever...
Located at the southernmost sector of Western Branch East African Rift System, Malawi exemplifies an active, magma-poor, weakly extended continental rift. To investigate controls on rifting, we image crustal and uppermost mantle structure beneath region using ambient-noise teleseismic Rayleigh-wave phase velocities between 9 100 s period. Our study includes six lake-bottom seismometers located in Lake (Nyasa), first time have been deployed any rift lakes. Noise levels lake are lower than...
Sediments play a key role in subduction. They help control the chemistry of arc volcanoes and location seismic hazards. Here, we present new model describing fate subducted sediments that explains magnetotelluric models subduction zones, which commonly show an enigmatic conductive anomaly at trenchward side volcanic arcs. In many will melt source region for melts. High-pressure experiments these sediment melts react with overlying mantle wedge to produce electrically phlogopite pyroxenites....
Denman Glacier is one of the largest outlet glaciers in Antarctica. Despite its potential significance for sea level change, geometry and dynamics remain poorly constrained, making predictions response to changing climate challenging. Seismic signals arise from internal stress interaction with subglacial landscape, however, seismic methods are still an often underutilised tool investigating glacial characteristics. In fact, seismology provides few tools directly observing processes...
Solid Earth structure, often overlooked as a component of system interactions, can be an important the battle between gravity and heat plays out in mantle. The heterogeneity crust, changing topography character sub-ice region further intensifies or adds fine detail to variability influence from beneath. This is dynamic foundation for ice sheets other components. In this presentation, aspects solid structure that impact sheet components are reviewed their past, present future on...
Research Article| September 07, 2016 Acquisition of a Unique Onshore/Offshore Geophysical and Geochemical Dataset in the Northern Malawi (Nyasa) Rift Donna J. Shillington; Shillington aLamont‐Doherty Earth Observatory Columbia University, Palisades, New York 10964 U.S.A.djs@ldeo.columbia.edu Search for other works by this author on: GSW Google Scholar James B. Gaherty; Gaherty Cynthia Ebinger; Ebinger bEarth Environmental Sciences, University Rochester, 14627 U.S.A. Christopher A. Scholz;...
Abstract Interpretation of electrical conductivity anomalies observed in magnetotelluric models provides an important opportunity to understand the nature lithospheric mantle and its dynamics. Over course last two decades, a great number experimental petrology studies have been carried out which can be utilized construct distribution for given composition geotherm. We developed open‐source software (MATE, Mantle Analysis Tool Electromagnetics) with easy‐to‐use graphical interface that...
Many geophysical images of ancient orogenic belts utilise seismic reflection data but increasingly magnetotelluric (MT) have been shown to provide insights into architecture not evident in surveys, particularly through their ability image steep structures. A 140km long MT survey carried out Palaeoproterozoic crust central Australia has imaged a crustal‐scale conductivity contrast across steeply‐dipping boundary. The surface location this coincides with the Redbank Thrust Zone, previously...
Research Article| September 01, 2009 Magnetotelluric constraints on subduction polarity: Reversing reconstruction models for Proterozoic Australia Kate Selway; Selway 1Tectonics, Resources and Exploration (TRaX), School of Earth Environmental Sciences, University Adelaide, South 5005, Search other works by this author on: GSW Google Scholar Martin Hand; Hand Graham S. Heinson; Heinson Justin L. Payne Australia2GEMOC (Geochemical Evolution Metallogeny Continents), Department Planetary...
Abstract Three parameters: temperature, hydrogen content, and the presence of partial melt, are dominant controls on rheology convecting upper mantle. As such, they determine dynamics that control plate tectonics continental evolution. Since depresses peridotite solidus these parameters strongly linked petrologically. We have developed a genetic algorithm code to statistically assess likelihood section mantle contains melt. This uses magnetotelluric observations petrological constraints...
Abstract The tectonic history of southern Africa includes Archean craton formation, multiple episodes subduction and rifting some the world's most significant magmatic events. These processes left behind a compositional trail that can be observed in xenoliths measured by geophysical methods. abundance kimberlites makes it an ideal place to test calibrate mantle interpretations then applied less well‐constrained regions. Magnetotellurics (MT) is particularly useful tool for understanding...
Abstract Kimberlites are igneous rocks whose formation remains enigmatic due to their severely altered nature, highly variable compositions and rapid ascent through the lithosphere. The spatiotemporal distribution of kimberlites suggests that mantle metasomatism may play an essential role in emplacement. Since magnetotelluric (MT) method is sensitive metasomatic modification forms interconnected minerals water, we compiled MT models from Australia, Brazil, Botswana, Canada, Namibia, South...
Abstract The Southern African Magnetotelluric Experiment (SAMTEX) involved the collection of data at over 700 sites in Archean to Proterozoic southern Africa, spanning features including Kalahari Craton, Bushveld Complex, and voluminous kimberlites. Here, we present first 3D inversions full SAMTEX set. In this paper, focus on assessing robustness models by comparing two different inversion codes, jif3D ModEM , subsets data, one containing all acceptable other a smaller selection undistorted,...
Abstract: Magnetotelluric (MT) data were collected over a 480 km long profile in central Australia, extending from the Mesoarchaean–Palaeoproterozoic Gawler Craton into Mesoproterozoic–Neoproterozoic Musgrave Province. The two regions have contrasting geological histories and many reconstruction models of Proterozoic Australia propose that they juxtaposed during Mesoproterozoic. Despite significant differences background between Province, MT did not image an electrical structure, or any...
Geodynamic models predict that rifting of thick, ancient continental lithosphere should not occur unless it is weakened by heating and magmatic intrusion. Therefore, the processes occurring along sections western branch East African Rift, where ∼150 km Palaeoproterozoic with no surface expression magmatism, are a significant challenge to understand. In an attempt understand apparently amagmatic extension we probed regional uppermost mantle for signatures thermal alteration using...