McMillan and Oldenburg (2014) develop a method for cooperatively inverting multiple electromagnetic data sets to produce a “consistent” 3D resistivity/conductivity model with improved resolution. Their data set includes airborne-time-domain electromagnetic data, controlled-source audio-frequency magnetotellurics (with inline electric-field and orthogonal magnetic-field measurements for frequencies ranging between 2 and 2048 Hz), and DC resistivity data. Because (1) conductivity/resistivity is known to be frequency-dependent especially in the presence of disseminated metallic particles (Wong, 1979; Marchant et al., 2013), (2) the range of frequencies investigated by McMillan and Oldenburg (2014) is rather substantial ( orders of magnitudes), and...
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October 23, 2014
Comment on “Cooperative constrained inversion of multiple electromagnetic data sets” (Michael S. McMillan and Douglas W. Oldenburg, 2014, Geophysics, 79, no. 4, B173–B185)
André Revil
André Revil
1
Colorado School of Mines
, Department of Geophysics, Golden, Colorado, USA
and Université de Savoie
, ISTerre, CNRS, UMR, Le Bourget du Lac, France
. E-mail: arevil@mines.edu.
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André Revil
1
Colorado School of Mines
, Department of Geophysics, Golden, Colorado, USA
and Université de Savoie
, ISTerre, CNRS, UMR, Le Bourget du Lac, France
. E-mail: arevil@mines.edu.
Publisher: Society of Exploration Geophysicists
Received:
05 Jul 2014
Revision Received:
16 Aug 2014
Accepted:
18 Aug 2014
First Online:
13 Jul 2017
Online ISSN: 1942-2156
Print ISSN: 0016-8033
Society of Exploration Geophysicists
Geophysics (2014) 79 (6): X27–X31.
Article history
Received:
05 Jul 2014
Revision Received:
16 Aug 2014
Accepted:
18 Aug 2014
First Online:
13 Jul 2017
Connected Content
Citation
André Revil; Comment on “Cooperative constrained inversion of multiple electromagnetic data sets” (Michael S. McMillan and Douglas W. Oldenburg, 2014, Geophysics, 79, no. 4, B173–B185). Geophysics 2014;; 79 (6): X27–X31. doi: https://doi.org/10.1190/geo2014-0306.1
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Index Terms/Descriptors
- data acquisition
- data processing
- direct-current methods
- electrical anomalies
- electrical conductivity
- electrical methods
- electromagnetic methods
- equations
- geophysical methods
- gold ores
- inverse problem
- magnetotelluric methods
- mathematical methods
- measurement
- metal ores
- mineral exploration
- resistivity
- three-dimensional models
- Cole-Cole model
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