Search Results - "Kalscheuer, Thomas"

Magnetotelluric Constraints on the Temperature, Composition, Partial Melt Content, and Viscosity of the Upper Mantle Beneath Svalbard by Kate Selway, Maxim Yu Smirnov, Thomas Beka, J. P. O'Donnell, Alexander Minakov, Kim Senger, Jan Inge Faleide, Thomas Kalscheuer

“…Abstract Long‐period magnetotelluric (MT) data can be used to interpret upper mantle temperature, hydrogen content, and the presence of partial melt, all of…”
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Research note: A comparison between normalized controlled‐source electromagnetic field components and transfer functions as input data for three‐dimensional non‐linear conjugate gradient inversion by Rulff, Paula, Kalscheuer, Thomas

“…Controlled‐source electromagnetic methods are applied to survey the electrical resistivity distribution of the subsurface. This work compares normalized…”
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Uncertainty and Resolution Analysis of 2D and 3D Inversion Models Computed from Geophysical Electromagnetic Data by Ren, Zhengyong, Kalscheuer, Thomas

“…A meaningful solution to an inversion problem should be composed of the preferred inversion model and its uncertainty and resolution estimates. The model…”
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A goal-oriented adaptive finite-element approach for plane wave 3-D electromagnetic modelling by Ren, Zhengyong, Kalscheuer, Thomas, Greenhalgh, Stewart, Maurer, Hansruedi

“…We have developed a novel goal-oriented adaptive mesh refinement approach for finite-element methods to model plane wave electromagnetic (EM) fields in 3-D…”
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Correction to: Uncertainty and Resolution Analysis of 2D and 3D Inversion Models Computed from Geophysical Electromagnetic Data by Ren, Zhengyong, Kalscheuer, Thomas

“…An error has been found and should be corrected…”
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Efficient goal-oriented mesh refinement in 3-D finite-element modelling adapted for controlled source electromagnetic surveys by Rulff, Paula, Buntin, Laura M, Kalscheuer, Thomas

“…SUMMARY We developed a 3-D forward modelling code, which simulates controlled source electromagnetic problems in frequency domain using edge-based finite…”
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Iterative solution methods for 3D controlled-source electromagnetic forward modelling of geophysical exploration scenarios by Weiss, Michael, Neytcheva, Maya, Kalscheuer, Thomas

“…We develop an efficient and robust iterative framework suitable for solving the linear system of equations resulting from the spectral element discretisation…”
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Two-Dimensional Magnetotelluric Modelling of Ore Deposits: Improvements in Model Constraints by Inclusion of Borehole Measurements by Kalscheuer, Thomas, Juhojuntti, Niklas, Vaittinen, Katri

“…A combination of magnetotelluric (MT) measurements on the surface and in boreholes (without metal casing) can be expected to enhance resolution and reduce the…”
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Two-dimensional probabilistic inversion of plane-wave electromagnetic data: methodology, model constraints and joint inversion with electrical resistivity data by Rosas-Carbajal, Marina, Linde, Niklas, Kalscheuer, Thomas, Vrugt, Jasper A.

“…Probabilistic inversion methods based on Markov chain Monte Carlo (MCMC) simulation are well suited to quantify parameter and model uncertainty of nonlinear…”
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Boat-towed radio-magnetotelluric and controlled source audio-magnetotelluric study to resolve fracture zones at Äspö Hard Rock Laboratory site, Sweden by Wang, Shunguo, Bastani, Mehrdad, Constable, Steven, Kalscheuer, Thomas, Malehmir, Alireza

“…SUMMARY Boat-towed radio-magnetotelluric (RMT) measurements using signals between 14 and 250 kHz have attracted increasing attention in the near-surface…”
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Spectral element method for 3-D controlled-source electromagnetic forward modelling using unstructured hexahedral meshes by Weiss, M, Kalscheuer, T, Ren, Z

“…SUMMARY For forward modelling of realistic 3-D land-based controlled-source electromagnetic (EM) problems, we develop a parallel spectral element approach,…”
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Gravity Gradient Tensor of Arbitrary 3D Polyhedral Bodies with up to Third-Order Polynomial Horizontal and Vertical Mass Contrasts by Ren, Zhengyong, Zhong, Yiyuan, Chen, Chaojian, Tang, Jingtian, Kalscheuer, Thomas, Maurer, Hansruedi, Li, Yang

“…During the last 20 years, geophysicists have developed great interest in using gravity gradient tensor signals to study bodies of anomalous density in the…”
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Gravity Anomalies of Arbitrary 3D Polyhedral Bodies with Horizontal and Vertical Mass Contrasts by Ren, Zhengyong, Chen, Chaojian, Pan, Kejia, Kalscheuer, Thomas, Maurer, Hansruedi, Tang, Jingtian

“…During the last 15 years, more attention has been paid to derive analytic formulae for the gravitational potential and field of polyhedral mass bodies with…”
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Improved accuracy of plane-wave electromagnetic modelling by application of the total and scattered field decomposition and perfectly matched layers by Buntin, L M, Kalscheuer, T, Kreiss, G, Ren, Z

“…SUMMARY In 2-D magnetotelluric modelling, the standard application of Dirichlet boundary conditions (BC) may severely diminish the solution accuracy, because…”
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Radiomagnetotelluric two-dimensional forward and inverse modelling accounting for displacement currents by Kalscheuer, Thomas, Pedersen, Laust B., Siripunvaraporn, Weerachai

“…Electromagnetic surface measurements with the radiomagnetotelluric (RMT) method in the frequency range between 10 and 300 kHz are typically interpreted in the…”
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Boundary element solutions for broad-band 3-D geo-electromagnetic problems accelerated by an adaptive multilevel fast multipole method by Ren, Zhengyong, Kalscheuer, Thomas, Greenhalgh, Stewart, Maurer, Hansruedi

“…We have developed a generalized and stable surface integral formula for 3-D uniform inducing field and plane wave electromagnetic induction problems, which…”
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Two-dimensional audiomagnetotelluric and magnetotelluric modelling of ore deposits: Improvements in model constraints by inclusion of borehole measurements by Kalscheuer, Thomas, Juhojuntti, Niklas, Vaittinen, Katri

“…A combination of magnetotelluric (MT) measurements on the surface and in boreholes (without metal casing) can be expected to enhance resolution and reduce the…”
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A hybrid boundary element-finite element approach to modeling plane wave 3D electromagnetic induction responses in the Earth by Ren, Zhengyong, Kalscheuer, Thomas, Greenhalgh, Stewart, Maurer, Hansruedi

“…A novel hybrid boundary element-finite element scheme which is accelerated by an adaptive multi-level fast multipole algorithm is presented to simulate 3D…”
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Exact solutions of the vertical gravitational anomaly for a polyhedral prism with vertical polynomial density contrast of arbitrary orders by Chen, Chaojian, Ren, Zhengyong, Pan, Kejia, Tang, Jingtian, Kalscheuer, Thomas, Maurer, Hansruedi, Sun, Ya, Li, Yang

“…We present general closed-form solutions for the vertical gravitational anomaly caused by a polyhedral prism with mass density contrast varying with depth. Our…”
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Focused time-lapse inversion of radio and audio magnetotelluric data by Rosas Carbajal, Marina, Linde, Niklas, Kalscheuer, Thomas

“…Geoelectrical techniques are widely used to monitor groundwater processes, while surprisingly few studies have considered audio (AMT) and radio (RMT)…”
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