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Department of Geoscience

HydroGeophysics Group

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Christensen, NB, Reid, JE & Halkjær, M 2009, 'Fast, laterally smooth inversion of airborne time-domain electromagnetic data', Near Surface Geophysics, vol. 7, no. 5-6, pp. 599-612. https://doi.org/10.3997/1873-0604.2009047

Christensen, NB, Fitzpatrick, A & Munday, T 2010, 'Fast approximate 1D inversion of frequency domain electromagnetic data', Near Surface Geophysics, vol. 8, no. 1, pp. 1-15. https://doi.org/10.3997/1873-0604.2009026

Christensen, NB & Lawrie, K 2012, 'Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system', Exploration Geophysics, vol. 43, pp. 213-227. <http://www.publish.csiro.au/nid/224/display/citation/paper/EG12005.htm>

Christensen, NB 2014, 'Sensitivity functions of transient electromagnetic methods', Geophysics, vol. 79, no. 4, pp. E167-E182. https://doi.org/10.1190/GEO2013-0364.1

Christensen, NB & Halkjær, M 2014, 'Mapping pollution and coastal hydrogeology with helicopterborne transient electromagnetic measurements', Exploration Geophysics, vol. 45, no. 4, pp. 243-254. https://doi.org/10.1071/EG13071

Christensen, NB & Lawrie, K 2014, 'Response to comments by Adam Smiarowski and Shane Mulè on: Christensen, N., and Lawrie, K., 2012. Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system', Exploration Geophysics, vol. 43, pp. 213-227. https://doi.org/10.1071/EG14015

Christensen, NB 2016, 'Fast approximate 1D modelling and inversion of transient electromagnetic data', Geophysical Prospecting, vol. 64, no. 6, pp. 1620-1631. https://doi.org/10.1111/1365-2478.12373

Christensen, NB 2016, 'Strictly horizontal lateral parameter correlation for 1D inverse modelling of large data sets', Near Surface Geophysics, vol. 14, no. 5, pp. 403-411 . https://doi.org/10.3997/1873-0604.2016028

Christensen, NB 2018, 'Interpretation attributes derived from airborne electromagnetic inversion models using the continuous wavelet transform', Near Surface Geophysics, vol. 16, no. 6, pp. 665-678. https://doi.org/10.1002/nsg.12018

Christensen, NB & C. Lawrie, K 2017, 'A novel approach to comparing AEM inversion results with borehole conductivity logs', Exploration Geophysics, vol. 49, no. 3, pp. 309-322. https://doi.org/10.1071/EG17029

Christensen, NB & Christiansen, AV 2021, 'Using geophysical survey results in the inference of aquifer vulnerability measures', Near Surface Geophysics, vol. 19, no. 5, pp. 505-521. https://doi.org/10.1002/nsg.12171

Christensen, NB 2022, 'Joint inversion of airborne TEM data and surface geoelectrical data: The Egebjerg case', Journal of Applied Geophysics, vol. 196, no. 3, 104511. https://doi.org/10.1016/j.jappgeo.2021.104511

Christensen, NB 2022, 'Resolution attributes for geophysical inversion models: Depth of investigation and novel measures', Near Surface Geophysics, vol. 20, no. 1, pp. 3-15. https://doi.org/10.1002/nsg.12188

Christensen, NB & Jacobsen, BH 2025, 'A fast hybrid 1D inversion approach for ground conductivity data', Near Surface Geophysics, vol. 23, no. 1, pp. 30-48. https://doi.org/10.1002/nsg.12327

Christensen, NB 2025, 'Linear filter theory for the forward Laplace transform and its use in calculating 1D EM responses', Computers and Geosciences, vol. 198, 105865. https://doi.org/10.1016/j.cageo.2025.105865

Christensen, NB , Christiansen, AV , Auken, E & Foged, N 2026, 'An open source FORTRAN subroutine for calculation of TEM responses and derivatives from 1D models', Computers and Geosciences, vol. 209, 106102. https://doi.org/10.1016/j.cageo.2025.106102

Chongo, M, Christiansen, AV, Tembo, A, Banda, KE, Nyambe, IA, Larsen, F & Bauer-Gottwein, P 2015, 'Airborne and ground-based transient electromagnetic mapping of groundwater salinity in the Machile-Zambezi Basin, southwestern Zambia', Near Surface Geophysics, vol. 13, no. 4, pp. 383-395. https://doi.org/10.3997/1873-0604.2015024

Chongo, M, Christiansen, AV , Fiandaca, G, Nyambe, IA, Larsen, F & Bauer-Gottwein, P 2015, 'Mapping localised freshwater anomalies in the brackish paleo-lake sediments of the Machile-Zambezi Basin with transient electromagnetic sounding, geoelectrical imaging and induced polarisation', Journal of Applied Geophysics, vol. 123, pp. 81-92. https://doi.org/10.1016/j.jappgeo.2015.10.002

Chandra, S, Ahmed, S, Auken, E , Pedersen, JB, Singh, A & Verma, SK 2016, '3D aquifer mapping employing airborne geophysics to meet India's water future', The Leading Edge (Tulsa), vol. 35, no. 9, pp. 770-774. https://doi.org/10.1190/tle35090770.1

Chandra, S, Auken, E , Maurya, PK, Ahmed, S & Verma, SK 2019, 'Large Scale Mapping of Fractures and Groundwater Pathways in Crystalline Hardrock By AEM', Scientific Reports, vol. 9, 398. https://doi.org/10.1038/s41598-018-36153-1

Chandra, S, Choudhury, J, Maurya, PK, Ahmed, S, Auken, E & Verma, SK 2020, 'Geological significance of delineating paleochannels with AEM', Exploration Geophysics, vol. 51, no. 1, pp. 74-83. https://doi.org/10.1080/08123985.2019.1646098

Chandra, S, Jacobsen, BH , Christensen, NB, Ahmed, S & Verma, SK 2020, 'Multiparametric coupling and constrained interpolation to improve natural recharge estimation', Journal of Earth System Science, vol. 129, no. 1, 8. https://doi.org/10.1007/s12040-019-1253-z

Cai, H, Hu, X, Xiong, B, Auken, E, Han, M & Li, J 2017, 'Finite element time domain modeling of controlled-Source electromagnetic data with a hybrid boundary condition', Journal of Applied Geophysics, vol. 145, pp. 133-143. https://doi.org/10.1016/j.jappgeo.2017.08.005

Cai, H, Kong, R, He, Z, Wang, X, Liu, S, Huang, S, Kass, MA & Hu, X 2024, 'Joint inversion of potential field data with adaptive unstructured tetrahedral mesh', Geophysics, vol. 89, no. 3, pp. G45-G63. https://doi.org/10.1190/geo2023-0280.1

Burschil, T, Wiederhold, H & Auken, E 2012, 'Seismic results as a-priori knowledge for airborne TEM data inversion - A case study', Journal of Applied Geophysics, vol. 80, pp. 121-128. https://doi.org/10.1016/j.jappgeo.2012.02.003

Burgess, JAJ, Fortin, DC, Losby, JE, Grombacher, D, Davis, JP & Freeman, MR 2011, 'Thermally activated decay of magnetic vortices (vol 82, 144403, 2010)', Physical Review B, vol. 83, no. 1, 019904. https://doi.org/10.1103/PhysRevB.83.019904

Bouligand, C, Hurwitz, S, Vandemeulebrouck, J, Byrdina, S, Kass, MA & Lewicki, J 2019, 'Heat and mass transport in a vapor-dominated hydrothermal area in Yellowstone National Park, USA: Inferences from magnetic, electrical, electromagnetic, subsurface temperature, and diffuse CO2 flux measurements', Journal of Geophysical Research: Solid Earth, vol. 124, no. 1, pp. 291-309. https://doi.org/10.1029/2018JB016202

Böttner, C, Jakobsen, FW, Nielsen, T, Winsborrow, M, Polteau, S, Mazzini, A, Planke, S, Andresen, KJ, Millinge, OJS, Asif, MR, Laberg, JS, Hopper, J, Myklebust, R & Seidenkrantz, MS 2025, 'Natural hydrocarbon seepage at the Northeast Greenland continental shelf', Communications Earth and Environment, vol. 6, no. 1, 879. https://doi.org/10.1038/s43247-025-02932-8

Bording, TS , Fiandaca, G , Maurya, PK , Auken, E , Christiansen, AV, Tuxen, N, Klint, KES & Larsen, TH 2019, 'Cross-borehole tomography with full-decay spectral time-domain induced polarization for mapping of potential contaminant flow-paths', Journal of Contaminant Hydrology, vol. 226, 103523. https://doi.org/10.1016/j.jconhyd.2019.103523

Bording, T , Kühl, AK , Fiandaca, G, Christensen, JF, Christiansen, AV & Auken, E 2021, 'Cross-borehole geoelectrical time-lapse monitoring of in situ chemical oxidation and permeability estimation through induced polarization', Near Surface Geophysics, vol. 19, no. 1, pp. 43-58. https://doi.org/10.1002/nsg.12131

Bording, TS , Asif, MR , Barfod, AS , Larsen, JJ , Zhang, B , Grombacher, DJ , Christiansen, AV , Engebretsen, KW , Pedersen, JB , Maurya, PK & Auken, E 2021, 'Machine learning based fast forward modelling of ground-based time-domain electromagnetic data', Journal of Applied Geophysics, vol. 187, 104290. https://doi.org/10.1016/j.jappgeo.2021.104290

Boesen, TJ , Auken, E , Christiansen, AV , Fiandaca, G , Kirkegaard, C, Pfaffhuber, AA & Vöge, M 2018, 'An efficient 2D inversion scheme for airborne frequency domain data', Geophysics, vol. 83, no. 4, pp. E189-E201. https://doi.org/10.1190/geo2017-0280.1

Boesen, T , Auken, E , Christiansen, AV , Fiandaca, G & Schamper, C 2018, 'A parallel computing thin-sheet inversion algorithm for airborne time-domain data utilising a variable overburden', Geophysical Prospecting, vol. 66, no. 7, pp. 1402-1414. https://doi.org/10.1111/1365-2478.12630

Blatter, D, Key, K, Ray, A, Foley, N, Tulaczyk, S & Auken, E 2018, 'Trans-Dimensional Bayesian Inversion of Airborne Transient EM Data From Taylor Glacier, Antarctica', Geophysical Journal International, vol. 214, no. 3, pp. 1919-1936. https://doi.org/10.1093/gji/ggy255

Behroozmand, A , Auken, E , Fiandaca, G , Christiansen, AV & Christensen, NB 2012, 'Efficient full decay inversion of MRS data with a stretched-exponential approximation of the T2* distribution', Geophysical Journal International, vol. 190, no. 2, pp. 900-912. https://doi.org/10.1111/j.1365-246X.2012.05558.x

Behroozmand, A , Dalgaard, EB , Christiansen, AV & Auken, E 2013, 'A comprehensive study of the parameter determination in a joint MRS and TEM data analysis scheme', Near Surface Geophysics, vol. 11, no. 5, pp. 557-567. https://doi.org/10.3997/1873-0604.2013040

Behroozmand, AA , Auken, E , Fiandaca, G & Christiansen, AV 2012, 'Improvement in MRS parameter estimation by joint and laterally constrained inversion of MRS and TEM data', Geophysics, vol. 77, no. 4, pp. WB191-WB200. https://doi.org/10.1190/geo2011-0404.1

Behroozmand, AA, Keating, K & Auken, E 2015, 'A Review of the Principles and Applications of the NMR Technique for Near-Surface Characterization', Surveys in Geophysics, vol. 36, no. 1, pp. 27-85. https://doi.org/10.1007/s10712-014-9304-0

Behroozmand, AA , Auken, E , Fiandaca, G & Rejkjaer, S 2016, 'Increasing the resolution and the signal-to-noise ratio of magnetic resonance sounding data using a central loop configuration', Geophysical Journal International, vol. 205, no. 1, pp. 243-256. https://doi.org/10.1093/gji/ggw004

Behroozmand, AA, Knight, R, Müller-Petke, M, Auken, E , Barfod, AAS, Ferré, TPA, Vilhelmsen, TN, Johnson, CD & Christiansen, AV 2017, 'Successful Sampling Strategy Advances Laboratory Studies of NMR Logging in Unconsolidated Aquifers', Geophysical Research Letters, vol. 44, no. 21, pp. 11,021-11,029. https://doi.org/10.1002/2017GL074999

Behroozmand, AA, Auken, E & Knight, R 2019, 'Assessment of managed aquifer recharge sites using a new geophysical imaging method', Vadose Zone Journal, vol. 18, no. 1, 180184. https://doi.org/10.2136/vzj2018.10.0184

Bedrosian, PA, Schamper, C & Auken, E 2016, 'A comparison of helicopter-borne electromagnetic systems for hydrogeologic studies', Geophysical Prospecting, vol. 64, no. 1, pp. 192–215. https://doi.org/10.1111/1365-2478.12262

Barfod, A, Møller, I & Christiansen, AV 2016, 'Compiling a national resistivity atlas of Denmark based on airborne and ground-based transient electromagnetic data', Journal of Applied Geophysics, vol. 134, pp. 199-209. https://doi.org/10.1016/j.jappgeo.2016.09.017

Barfod, A, Møller, I, Christiansen, AV, Høyer, A-S, Hoffimann, J, Straubhaar, J & Caers, J 2018, 'Hydrostratigraphic modeling using multiple-point statistics and airborne transient electromagnetic methods', Hydrology and Earth System Sciences, vol. 22, no. 6, 413, pp. 3351-3373. https://doi.org/10.5194/hess-2017-413

Barfod, AAS , Vilhelmsen, TN, Jørgensen, F, Christiansen, AV, Hyer, AS, Straubhaar, J & Møller, I 2018, 'Contributions to uncertainty related to hydrostratigraphic modeling using multiple-point statistics', Hydrology and Earth System Sciences, vol. 22, no. 10, pp. 5485-5508. https://doi.org/10.5194/hess-22-5485-2018, https://doi.org/10.5194/hess-22-5485-2018

Balbarini, N, Rønde, V, Maurya, PK , Fiandaca, G , Balling, IM, Klint, KE, Christiansen, AV, John Binning, P & Løgstrup Bjerg, P 2018, 'Geophysics-supported contaminant mass discharge quantification downgradient of a landfill and a former pharmaceutical factory', Water Resources Research, vol. 54, no. 8, pp. 5436-5456. https://doi.org/10.1029/2017WR021855

Balbarini, N, Rønde, V, Maurya, P , Fiandaca, G, Møller, I, Klint, KE, Christiansen, AV, Binning, PJ & Bjerg, PL 2018, 'Geophysics-Based Contaminant Mass Discharge Quantification Downgradient of a Landfill and a Former Pharmaceutical Factory', Water Resources Research, vol. 54, no. 8, pp. 5436-5456. https://doi.org/10.1029/2017WR021855

Auken, E, Nebel, L, Sørensen, KI, Breiner, M, Pellerin, L & Christensen, NB 2002, 'EMMA - a geophysical training and education tool for electromagnetic modeling and analysis', Journal of Environmental and Engineering Geophysics, vol. 7, no. 2, pp. 57-68.

Auken, E, Jørgensen, F & Sørensen, KI 2003, 'Large-scale TEM investigation for groundwater', Exploration Geophysics, vol. 33, pp. 188-194.

Auken, E & Christiansen, AV 2004, 'Layered and laterally constrained 2D inversion of resistivity data', Geophysics, pp. 752-761.

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