N.B. Christensen

Research output

Research output per year 1993 2001 2002 2003 2006 2017 2022 2025

• 38 Journal article
• 7 Working paper
• 6 Comment/debate/letter to the editor
• 5 Report
• 8 More
  • 5 Article in proceedings
  • 2 Paper
  • 1 Book chapter

Research output per year

Research output per year

Search results

• 2025

  A fast hybrid 1D inversion approach for ground conductivity data

  Christensen, N. B. & Jacobsen, B. H., Feb 2025, In: Near Surface Geophysics. 23, 1, p. 30-48 19 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Hybrid Inversion 100%
  • Ground Conductivity 100%
  • Low Frequency Approximation 66%
  • Quasi-static Approximation 66%
  • Frequency Domain Data 33%

• Linear filter theory for the forward Laplace transform and its use in calculating 1D EM responses

  Christensen, N. B., Apr 2025, In: Computers and Geosciences. 198, 105865.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Linear Filter 100%
  • EM Response 100%
  • Filter Theory 100%
  • Fast Hankel Transform 66%
  • Laplace Transform Method 33%
• 2024

  Mere sikre valg af nedsivningsområder

  Christensen, N. B., Christiansen, A. V. & Christensen, N. K., Dec 2024, In: Vand & Jord. 31. årgang, December 2024, p. 144-149 6 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Communication
• 2023

  Evaluating the impact of correlated noise for time-lapse transient electromagnetic (TEM) monitoring studies

  McLachlan, P., Christiensen, N. B., Grombacher, D. & Christiansen, A. V., Oct 2023, In: Near Surface Geophysics. 21, 5, p. 333-342 10 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  Open Access

  File

  • Radio Wave 100%
  • Electromagnetic Monitoring 100%
  • Covariance 50%
  • Stacking 50%
  • Radio Signal 50%
  5 Citations (Scopus)

  3 Downloads (Pure)
• 2022

  Joint inversion of airborne TEM data and surface geoelectrical data: The Egebjerg case

  Christensen, N. B., Jan 2022, In: Journal of Applied Geophysics. 196, 3, 10 p., 104511.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  Open Access

  File

  • Denmark 100%
  6 Citations (Scopus)

  20 Downloads (Pure)

• Pivotal moments: Seven scenes from a geophysics adventure: Scene 2

  Christensen, N. B., Apr 2022, In: Preview. 217, p. 31-32 2 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Comment/debate/letter to the editor › Communication

• Pivotal moments: Seven scenes from a geophysics adventure: Scene 1

  Christensen, N. B., Feb 2022, In: Preview. 216, p. 32-34 3 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Comment/debate/letter to the editor › Communication

• Pivotal moments: Seven scenes from a geophysics adventure: Scene 4

  Christensen, N. B., Aug 2022, In: Preview. 219, p. 31-32 3 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Comment/debate/letter to the editor › Communication

• Pivotal moments: Seven scenes from a geophysics adventure: Scene 7

  Christensen, N. B., Dec 2022, In: Preview. 221, p. 34-37 4 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Comment/debate/letter to the editor › Communication

• Pivotal moments: Seven scenes from a geophysics adventure: Scene 3

  Christensen, N. B., Jun 2022, In: Preview. 218, p. 33-35 3 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Comment/debate/letter to the editor › Communication

• Pivotal moments: Seven scenes from a geophysics adventure: Scenes 5 & 6

  Christensen, N. B., 2022, In: Preview. 220, p. 30-32 3 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Comment/debate/letter to the editor › Communication

• Resolution attributes for geophysical inversion models: Depth of investigation and novel measures

  Christensen, N. B., Feb 2022, In: Near Surface Geophysics. 20, 1, p. 3-15 13 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Residuals 100%
  • Model Resolution Matrix 50%
  • Model Resolution 50%
  3 Citations (Scopus)
• 2021

  Using geophysical survey results in the inference of aquifer vulnerability measures

  Christensen, N. B. & Christiansen, A. V., Oct 2021, In: Near Surface Geophysics. 19, 5, p. 505-521 17 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Biological Hazard 100%
  3 Citations (Scopus)
• 2020

  Multiparametric coupling and constrained interpolation to improve natural recharge estimation

  Chandra, S., Jacobsen, B. H., Christensen, N. B., Ahmed, S. & Verma, S. K., 2020, In: Journal of Earth System Science. 129, 1, 19 p., 8.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Interpolation 100%
  • Hard Rock 50%
  • Grid Line 50%
  • Spatial Distribution 25%
  • Kriging 25%
  1 Citation (Scopus)
• 2018

  Interpretation attributes derived from airborne electromagnetic inversion models using the continuous wavelet transform

  Christensen, N. B., Dec 2018, In: Near Surface Geophysics. 16, 6, p. 665-678 14 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Borehole 100%
  • Wavelet 100%
  • Vegetation 50%
  • Satellite Imagery 50%
  • Data Acquisition 50%
  6 Citations (Scopus)
• 2017

  An inter-disciplinary, multi-physics approach for rapid mapping and hydrogeological characterisation of neogene intra-plate fault systems in depositional landscapes

  Lawrie, K., Murray, T., Christensen, N. B., Brodie, R. S., Halas, L. & Gibson, D., 1 Jan 2017, 30th Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP 2017) : Proceedings of a meeting held 19-23 March 2017, Denver, Colorado, USA. . Environmental and Engineering Geophysical Society ( EEGS ), (Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP).

  Research output: Contribution to book/anthology/report/proceeding › Article in proceedings › Research › peer-review
  4 Citations (Scopus)

• A novel approach to comparing AEM inversion results with borehole conductivity logs

  Christensen, N. B. & C. Lawrie, K., 2017, In: Exploration Geophysics. 49, 3, p. 309-322 14 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Borehole 100%
  • Aquifer Recharge 8%
  • Broken Hill 8%
  3 Citations (Scopus)

• Deriving interpretation attributes from AEM surveys using the continuous wavelet transform

  Christensen, N. B., 1 Jan 2017, 2nd European Airborne Electromagnetics Conference 2017, Held at Near Surface Geoscience Conference and Exhibition 2017. European Association of Geoscientists and Engineers, p. 101-105 5 p.

  Research output: Contribution to book/anthology/report/proceeding › Article in proceedings › Research › peer-review

• Fast 3D multichannel deconvolution of electromagnetic induction loop-loop apparent conductivity data sets acquired at low induction numbers

  Guillemoteau, J., Christensen, N. B., Jacobsen, B. H. & Tronicke, J., 1 Nov 2017, In: Geophysics. 82, 6, p. E357-E369 13 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  Open Access

  File

  • Deconvolution 100%
  • Soil Science 33%
  • Harmonics 33%
  • Real Time 33%
  • Near-Surface Geology 33%
  20 Citations (Scopus)

  265 Downloads (Pure)

• Groundwater exploration using AEM in structurally complex, inverted sedimentary basins and paleovalleys, kimberley regio

  Lawrie, K. C., Symington, N., Christensen, N. B., Haber, E., Marchant, D., Murray, T., Halas, L., Tan, K. P., Brodie, R. C., Harris-Pascal, C., Gow, L. & Neumann, N., 1 Jan 2017, 2nd European Airborne Electromagnetics Conference 2017, Held at Near Surface Geoscience Conference and Exhibition 2017. European Association of Geoscientists and Engineers, p. 111-115 5 p.

  Research output: Contribution to book/anthology/report/proceeding › Article in proceedings › Research › peer-review
• 2016

  Fast approximate 1D modelling and inversion of transient electromagnetic data

  Christensen, N. B., 1 Nov 2016, In: Geophysical Prospecting. 64, 6, p. 1620-1631 12 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Step Response 100%
  • Space Step 100%
  22 Citations (Scopus)

• Strictly horizontal lateral parameter correlation for 1D inverse modelling of large data sets

  Christensen, N. B., Oct 2016, In: Near Surface Geophysics. 14, 5, p. 403-411 9 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Correlation Method 100%
  • Borehole 100%
  • Covariance 100%
  • Model Parameter 50%
  • One Dimensional 25%
  11 Citations (Scopus)
• 2015

  An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data

  Auken, E., Christiansen, A. V., Kirkegaard, C., Fiandaca, G., Schamper, C., Behroozmand, A. A., Binley, A., Nielsen, E., Effersø, F., Christensen, N. B., Sørensen, K., Foged, N. & Vignoli, G., 2015, In: Exploration Geophysics. 46, 3, p. 223-235 13 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  Open Access

  • Borehole 100%
  • Data Type 100%
  • Induced Polarization 100%
  • Electrical Resistivity 100%
  • Conductive 75%
  294 Citations (Scopus)
• 2014

  Mapping pollution and coastal hydrogeology with helicopterborne transient electromagnetic measurements

  Christensen, N. B. & Halkjær, M., 2014, In: Exploration Geophysics. 45, 4, p. 243-254 12 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  19 Citations (Scopus)

• 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

  Christensen, N. B. & Lawrie, K., 2014, In: Exploration Geophysics. 43, p. 213-227 15 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  1 Citation (Scopus)

• Sensitivity functions of transient electromagnetic methods

  Christensen, N. B., 2014, In: Geophysics. 79, 4, p. E167-E182 16 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Sensitivity Function 100%
  • Homogeneous Half 50%
  21 Citations (Scopus)
• 2013

  Derivative analysis for layer selection of geophysical borehole logs

  Davis, A. & Christensen, N. B., 2013, In: Computers & Geosciences. 60, p. 34-40 7 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  19 Citations (Scopus)
• 2012

  Efficient full decay inversion of MRS data with a stretched-exponential approximation of the T2* distribution

  Behroozmand, A., Auken, E., Fiandaca, G., Christiansen, A. V. & Christensen, N. B., 2012, In: Geophysical Journal International. 190, 2, p. 900-912 13 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  54 Citations (Scopus)

• Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system

  Christensen, N. B. & Lawrie, K., 2012, In: Exploration Geophysics. 43, p. 213-227 15 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  14 Citations (Scopus)
• 2010

  Evaluating the salinity distribution of a shallow coastal aquifer by vertical multielectrode profiling (Denmark)

  Poulsen, S. E., Rasmussen, K. R., Christensen, N. B. & Christensen, S., 1 Feb 2010, In: Hydrogeology Journal. 18, 1, p. 161-171 11 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  26 Citations (Scopus)

• Fast approximate 1D inversion of frequency domain electromagnetic data

  Christensen, N. B., Fitzpatrick, A. & Munday, T., 2010, In: Near Surface Geophysics. 8, 1, p. 1-15 15 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  13 Citations (Scopus)
• 2009

  A lateral model parameter correlation procedure for one-dimensional inverse modelling

  Christensen, N. B. & Tølbøll, R. J., 2009, In: Geophysical Prospecting. 57, 5, p. 919-929 11 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  17 Citations (Scopus)

• Aquifer investigations in the León-Chinandega plains, Nicaragua, using electromagnetic and electrical methods

  Corriols, M., Nielsen, M. R., Dahlin, T. & Christensen, N. B., 2009, In: Near Surface Geophysics. 7, 5-6, p. 413-425 13 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  17 Citations (Scopus)

• Fast, laterally smooth inversion of airborne time-domain electromagnetic data

  Christensen, N. B., Reid, J. E. & Halkjær, M., 2009, In: Near Surface Geophysics. 7, 5-6, p. 599-612 14 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
  28 Citations (Scopus)
• 2007

  Special Section - Marine Controlled-Source Electromagnetic Methods. 1D inversion and resolution analysis of marine controlled-source EM data

  Christensen, N. B. & Dodds, K., 2007, In: Geophysics. 72, p. WA27-WA38 12 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  1 Citation (Scopus)

• The sensitivity functions of frequency-domain magnetic dipole-dipole systems

  Tølbøll, R. J. & Christensen, N. B., 2007, In: Geophysics. 72, p. F45–F56 12 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  45 Citations (Scopus)
• 2006

  1D inversion and analysis of marine controlled-source EM data

  Christensen, N. B., Dodds, K. & Bulley, I., 2006, Proceedings of the AAPG meeting, Perth, WA, November 5-8, 2006.. 6 p.

  Research output: Contribution to book/anthology/report/proceeding › Article in proceedings › Research

  • Gas Bearing 100%
  • Sea Bottom 33%

• Approximate 2D inversion of airborne TEM data

  Christensen, N. B. & Wolfgram, P., 2006, Australian Earth Science Convention, 2-7 July, Melbourne, Australia. Australian Earth Science Convention, 5 p.

  Research output: Contribution to book/anthology/report/proceeding › Article in proceedings › Research

  • Deconvolution 100%
  • Layer Model 33%
  • Complex Structure 33%
  • Nonlinear Response 33%
  • Translational Invariance 33%

• A survey of current trends in near-surface electrical and electromagnetic methods

  Auken, E., Pellerin, L., Christensen, N. B. & Sørensen, K. I., 2006, In: Geophysics. 71, 5, p. G249-G260 11 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  136 Citations (Scopus)

• Monitoring CO₂ injection with cross-hole electrical resistivity tomography

  Christensen, N. B., 2006, In: Exploration Geophysics. 37, p. 44-49 6 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  55 Citations (Scopus)

• Robust 1D inversion and analysis of helicopter electromagnetic (HEM) data

  Tølbøll, R. J. & Christensen, N. B., 2006, In: Geophysics. 71, p. G53-G62 10 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  • Denmark 100%
  • Surface Layer 100%
  • Flight Test 100%
  • Electrical Method 100%
  • Near-Surface Geology 100%
  23 Citations (Scopus)
• 2005

  An Integrated Approach for Hydrogeophysical Investigations: New Technologies and a Case History

  Sørensen, K. I., Auken, E., Christensen, N. B. & Pellerin, L., 2005, Near-Surface Geophysics. Butler, D. K. (ed.). USA: Society of Exploration Geophysics, Vol. 13. p. 585-605 21 p. (Investigations in Geophysics, Vol. No. 13).

  Research output: Contribution to book/anthology/report/proceeding › Book chapter › Research
• 2004

  Tolkning af helikopterbårne elektromagnetiske frekvensdomænedata fra Stevns, Storstrøms Amt

  Christensen, N. B. & Tølbøll, R. J., 2004, Rapport til Storstrøms Amt ed. Geologisk Institut, Aarhus Universitet. 39 p.

  Research output: Book/anthology/dissertation/report › Report › Research
• 2003

  A detailed inversion scheme for helicopterborne electromagnetic frequency-domain data

  Tølbøll, R. J. & Christensen, N. B., 2003.

  Research output: Contribution to conference › Paper › Research

• Approximate 2D inversion of AEM data

  Wolfgram, P., Christensen, N. B. & Sattel, D., 2003.

  Research output: Contribution to conference › Paper › Research

  20 Citations (Scopus)

• Approximate 2D inversion of AEM data

  Wolfgram, P., Sattel, D. & Christensen, N. B., 2003, In: Exploration Geophysics. 34, p. 29-33 5 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

• Approximate 2D inversion of AEM data using the adaptive Born approximation

  Christensen, N. B., Wolfgram, P. & Sattel, D., 2003, Adelaide, p. 0-0.

  Research output: Working paper/Preprint › Working paper › Research

• A quantitative appraisal of airborne and ground-based transient electromagnetic (TEM) measurements in Denmark

  Christiansen, A. V. & Christensen, N. B., 2003, In: Geophysics. 68, p. 523-534 12 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

  41 Citations (Scopus)

• Tolkning af helikopterbårne elektromagnetiske frekvensdomænedata fra Ringkjøbing Amt: Rapport til Ringkjøbing Amt

  Christensen, N. B. & Tølbøll, R. J., 2003, Geologisk Institut, Aarhus Universitet. 26 p.

  Research output: Book/anthology/dissertation/report › Report › Research
• 2002

  A generic 1-D imaging method for transient electromagnetic data

  Christensen, N. B., 2002, In: Geophysics. 67, p. 438-447 10 p.

  Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research

  48 Citations (Scopus)