Detectability of 3-D sulphide targets with AFMAG

Mackie, Randall L.; Watts, M. D.

doi:10.1190/segam2012-1248.1

Cited by 12 publications

(4 citation statements)

References 12 publications

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“…Modeling MT data on islands does not require any special treatment of the ocean other than its inclusion in the 3D model, with appropriate resistivity values, out to sufficiently large distances so that the model boundaries are accurately represented. The MT modeling code used in this work is a proprietary commercial code that has a long history of use and has been benchmarked against semi‐analytical results and other numerical codes (e.g., Mackie & Watts, 2012; Miensopust et al., 2013). It has been used extensively for commercial exploration projects including oil and gas, geothermal, mining, and marine EM (e.g., Hoversten et al., 2021; Mackie et al., 2020; Soyer et al., 2018).…”

Section: Synthetic Modelmentioning

confidence: 99%

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Magnetotelluric Investigations of the Kīlauea Volcano, Hawaii

Hoversten¹,

Newman²,

Gasperikova³

et al. 2022

JGR Solid Earth

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In 2002 and 2003 a collaborative effort was undertaken between Lawrence Berkeley National Laboratory, Sandia National Laboratories, the U.S. Geological Survey (USGS) Menlo Park, the USGS Hawaiian Volcano Observatory, and Electromagnetic Instruments Inc. to study the Kīlauea volcano in Hawaii using the magnetotelluric (MT) technique. The work was motivated by a desire to improve understanding of the magma reservoirs and conduits within Kīlauea and the East and Southwest Rift zones, which has implications for understanding Kīlauea's plumbing system. An improved understanding of the rift zones has implications in understanding large‐scale landslides that are generated in the Hilina Slump, which produce significant impacts on coastal communities. Up to eight stations operated simultaneously, with multiple remote reference sites, and data were processed using multi‐station robust processing techniques. In total, data were acquired at 70 sites over the Southwest and East rift zones. Good to excellent quality data were obtained even in the harshest conditions, such as those encountered on the fresh lava flows of the East Rift Zone, where electrical contact resistances are on the order of 100 kΩ. A three‐dimensional (3D) MT model study was done to guide interpretation of the observed MT measurements. Synthetic modeling demonstrates that conductive bodies in the upper 3 km can be spatially resolved where MT station sampling is good. Resistivity anomalies in the 3D inversions have a high degree of spatial correlation with previously published seismic velocity anomalies beneath Kīlauea. Melt fractions between 0.096 and 0.117 are calculated for the Kīlauea and Puʻuʻōʻō low resistivity anomalies, respectively.

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Section: Synthetic Modelmentioning

confidence: 99%

“…Applying FIT on orthogonal cartesian grids leads to the standard Yee staggered grids (Yee, 1966), but the technique is easily extended to non‐orthogonal grids. More details on the implementation can be found in Mackie and Watts (2012).…”

Section: D Inversion Of Mt Datamentioning

confidence: 99%

Magnetotelluric Investigations of the Kīlauea Volcano, Hawaii

Hoversten¹,

Newman²,

Gasperikova³

et al. 2022

JGR Solid Earth

Self Cite

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show abstract

“…The preferred AMT model presented in this dissertation is based on CGG's RLM3D MT inversion code, used to invert the impedance tensors and map resistivity structures taking into account the steep topography (Mackie et al, 2020;Soyer et al, 2018;Mackie and Watts, 2012).…”

Section: -D Inversionmentioning

confidence: 99%

“…RLM3D utilizes a finite differences technique on staggered grids to solve Maxwell equations known as the Finite Integration Technique (FIT) (Mackie and Watts, 2012). It is formulated using a nonlinear conjugate gradient (NLCG) solver that directly minimizes an objective function applied on rectilinear orthogonal cartesian grids (Rodi and Mackie, 2001).…”

Section: -D Inversionmentioning

confidence: 99%

Three-Dimensional Modeling of Geothermal Systems in the Garibaldi Volcanic Belt, Canada, Using Magnetotelluric Data

Hormozzade Ghalati

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Geothermal systems are practical when the proper temperature settings, geological structures, and petrophysical characteristics exist near the ground surface, all of which should be evaluated to identify economically viable reserves. This dissertation presents procedures to examine (1) geological structures, (2) fluid flow pathways and their physical properties, and (3) subsurface temperature of geothermal systems by incorporating various geoscience datasets, including audio-magnetotelluric (AMT) data, rock physical properties, well logs, and fluid sample data.ix

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Application of 3-D Electromagnetic Inversion in Practice: Challenges, Pitfalls and Solution Approaches

Miensopust

2017

Surv Geophys

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Detectability of 3-D sulphide targets with AFMAG

Cited by 12 publications

References 12 publications

Magnetotelluric Investigations of the Kīlauea Volcano, Hawaii

Magnetotelluric Investigations of the Kīlauea Volcano, Hawaii

Three-Dimensional Modeling of Geothermal Systems in the Garibaldi Volcanic Belt, Canada, Using Magnetotelluric Data

Application of 3-D Electromagnetic Inversion in Practice: Challenges, Pitfalls and Solution Approaches

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