Search Results - "Newman, Gregory A."

New advances in three-dimensional controlled-source electromagnetic inversion by Commer, Michael, Newman, Gregory A.

“…New techniques for improving both the computational and imaging performance of the three-dimensional (3-D) electromagnetic inverse problem are presented. A…”
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A Review of High-Performance Computational Strategies for Modeling and Imaging of Electromagnetic Induction Data by Newman, Gregory A.

“…Many geoscientific applications exploit electrostatic and electromagnetic fields to interrogate and map subsurface electrical resistivity—an important…”
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Resistivity characterization of the Krafla and Hengill geothermal fields through 3D MT inverse modeling by Gasperikova, Erika, Rosenkjaer, Gudni K., Arnason, Knutur, Newman, Gregory A., Lindsey, Nathaniel J.

“…•Approach to increase confidence in resistivity structures accuracy and resolution.•These are the first 3D MT inversions of Krafla MT dataset.•Krafla and…”
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An accelerated time domain finite difference simulation scheme for three-dimensional transient electromagnetic modeling using geometric multigrid concepts by Commer, Michael, Newman, Gregory A.

“…The fact that the transient electromagnetic (TEM) field is smoothed gradually in space with time allows for a reduced spatial sampling rate of the EM field. On…”
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Three-dimensional controlled-source electromagnetic and magnetotelluric joint inversion by Commer, Michael, Newman, Gregory A.

“…The growing use of the controlled-source electromagnetic method (CSEM) and magnetotellurics (MT) for exploration applications has been driving the development…”
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Comparison of 3D MT inversions for geothermal exploration: Case studies for Krafla and Hengill geothermal systems in Iceland by Rosenkjaer, Gudni Karl, Gasperikova, Erika, Newman, Gregory A., Arnason, Knutur, Lindsey, Nathaniel J.

“…•Use three different 3D MT inversion codes for data from Krafla and Hengill in Iceland.•Comparison of resistivity and derived properties highlight structural…”
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Multistep inversion workflow for 3D long‐offset damped elastic waves in the Fourier domain by Petrov, Petr V., Newman, Gregory A.

“…ABSTRACT We present a new workflow for imaging damped three‐dimensional elastic wavefields in the Fourier domain. The workflow employs a multiscale imaging…”
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Improved workflow for 3D inverse modeling of magnetotelluric data: Examples from five geothermal systems by Lindsey, Nathaniel J., Newman, Gregory A.

“…•Standard approach to 3D MT finite difference inversion can be inefficient and yield poor solutions.•Alternative sequenced 3D MT finite difference workflow is…”
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Changes in geophysical properties caused by fluid injection into porous rocks: analytical models by Pride, Steven R., Berryman, James G., Commer, Michael, Nakagawa, Seiji, Newman, Gregory A., Vasco, Donald W.

“…ABSTRACT Analytical models are provided that describe how the elastic compliance, electrical conductivity, and fluid‐flow permeability of rocks depend on…”
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Three-dimensional magnetotelluric characterization of the Coso geothermal field by NEWMAN, Gregory A, GASPERIKOVA, Erika, HOVERSTEN, G. Michael, WANNAMAKER, Philip E

“…A dense grid of 125 magnetotelluric (MT) stations plus a single line of contiguous bipole array profiling has been acquired over the east flank of the Coso…”
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New advances in three dimensional transient electromagnetic inversion by Newman, Gregory A., Commer, Michael

“…Inversion of transient electromagnetic (TEM) data sets to image the subsurface three-dimensional (3-D) electrical conductivity and magnetic permeability…”
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Iterative Krylov solution methods for geophysical electromagnetic simulations on throughput-oriented processing units by Commer, Michael, Maia, Filipe RNC, Newman, Gregory A

“…Many geo-scientific applications involve boundary value problems arising in simulating electrostatic and electromagnetic fields for geophysical prospecting and…”
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Efficient pre-conditioned iterative solution strategies for the electromagnetic diffusion in the Earth: finite-element frequency-domain approach by Um, Evan Schankee, Commer, Michael, Newman, Gregory A.

“…We formulate a 3-D finite-element frequency-domain (FEFD) solution for electromagnetic (EM) diffusion and present efficient solution strategies. A system of…”
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Finite element modelling of transient electromagnetic fields near steel-cased wells by Um, Evan Schankee, Commer, Michael, Newman, Gregory A., Hoversten, G. Michael

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Three-dimensional inverse modelling of damped elastic wave propagation in the Fourier domain by Petrov, Petr V., Newman, Gregory A.

“…3-D full waveform inversion (FWI) of seismic wavefields is routinely implemented with explicit time-stepping simulators. A clear advantage of explicit time…”
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FDTD modeling of induced polarization phenomena in transient electromagnetics by Commer, Michael, Petrov, Petr V., Newman, Gregory A.

“…The finite-difference time-domain scheme is augmented in order to treat the modelling of transient electromagnetic signals containing induced polarization…”
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Multistep inversion workflow for 3D long-offset damped elastic waves in the Fourier domain by Petrov, Petr V., Newman, Gregory A.

“…We present a new workflow for imaging damped three-dimensional elastic wavefields in the Fourier domain. The workflow employs a multiscale imaging approach, in…”
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Compartmentalization of the Coso East Flank geothermal field imaged by 3-D full-tensor MT inversion by Lindsey, Nathaniel J., Kaven, Joern Ole, Davatzes, Nicholas, Newman, Gregory A.

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MPiTOUGH2: A parallel parameter estimation framework for hydrological and hydrogeophysical applications by Commer, Michael, Kowalsky, Michael B., Doetsch, Joseph, Newman, Gregory A., Finsterle, Stefan

“…We present a parallel joint hydrogeophysical parameter estimation framework specifically relevant for a class of inverse modeling applications where a large…”
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Compartmentalization of the Coso East Flank geothermal field imaged by 3-D full-tensor MT inversion by Lindsey, Nathaniel J., Kaven, Joern Ole, Davatzes, Nicholas, Newman, Gregory A.

“…Previous magnetotelluric (MT) studies of the high-temperature Coso geothermal system in California identified a subvertical feature of lowresistivity (2-5Ohmm)…”
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