Associate Professor

University of Copenhagen, Department of Geography and Geology

Øster Voldgade 10, 1350 Copenhagen K, Denmark

+45 35322454

ln@geo.ku.dk

Research interests:

Geologically applied geophysical research: Ground penetrating radar investigations of near-surface sediments, including cross-borehole techniques; processing, interpretation and modelling of seismic refraction and reflection data for mapping of near-surface sedimentary, deep crustal and mantle structures; development of shallow seismic fan shooting for location of low-velocity fault zones; multi-electrode geoelectrical studies for mapping of near-surface resistivity; development of a joint gravity and seismic inversion algorithm; joint interpretation of gravity and seismic data; optimisation of tomographic inversion algorithms; seismic wavefield modelling of shallow seismic data and super long-range seismic refraction data sections.

Advisor for PhD students:

Currently co-advisor for one PhD student (not related to FIVA).

Key publications:

Publications in peer-reviewed journals (incl. in press):
32. Nielsen, L., Müller, C., accepted, Preface to the Special Issue on Techniques of Near-Surface Seismic and Ground-Penetrating Radar Imaging, Journal of Applied Geophysics.
31. Nielsen, L., Møller, I., Nielsen, L.H., Johannessen, P.J., Pejrup, M., Andersen, T.J., Korshøj, J.S., 2009, Integrating ground-penetrating radar and borehole data from a Wadden Sea barrier island, Journal of Applied Geophysics, doi:10.1016/j.jappgeo.2009.01.002.
30. Cordua, K.S., Nielsen, L., Looms, M.C., Hansen, T.M., Binley, A., 2009. Quantifying the influence of static-like errors in least-squares-based inversion and sequential simulation of cross-borehole ground penetrating radar, Journal of Applied Geophysics, doi: 10.1016/j.jappgeo.2008.12.002.
29. Nielsen, L., Schack von Brockdorff, Bjerager, M. & Surlyk, F., 2009. Three-dimensional architecture and development of Danian bryozoan mounds at Limhamn, south-west Sweden, using
ground-penetrating radar, Sedimentology, 56, 695–708.
28. Sandrin, A., Nielsen, L. & Thybo, H., 2009.Layered crust–mantle transition zone below a large crustal intrusion in the Norwegian–Danish Basin, Tectonophysics, doi:10.1016/j.tecto.2008.05.039.
27. Johannessen, P.N., Nielsen, L.H., Nielsen, L., Møller, I., Pejrup, M., Andersen, T.J., Korshøj, J., Larsen, B. & Piasecki, S., 2008. Sedimentary facies and architecture of the Holocene to
Recent Rømø barrier island in the Danish Wadden Sea, Geological Survey of Denmark and Greenland Bulletin, 15, 49–52.
26. Looms, M. C., Binley, A., Jensen, K. H., Nielsen, L. & Hansen, T. M., 2008. Identifying unsaturated hydraulic parameters using an integrated data fusion approach on cross-borehole geophysical data, Vadose Zone Journal, 7, 238–248.
25. Cordua, K. S., Looms, M. C. & Nielsen, L., 2008. Accounting for correlated data errors during inversion of cross-borehole ground penetrating radar data, Vadose Zone Journal, 7, 263–271.
24. Hansen, T. M., Looms, M. C., & Nielsen, L., 2008. Inferring the sub-surface structural covariance model using cross-borehole ground penetrating radar, Vadose Zone Jounal, 7, 249–262.
23. Looms, M. C., Jensen, K. H., Binley, A. & Nielsen, L., 2008. Monitoring unsaturated flow and transport using cross-borehole geophysical methods, Vadose Zone Journal, 7, 227–237.
22. Nielsen, L., Jørgensen, N. O. & Gelting, P., 2007. Mapping of the freshwater lens in a coastal aquifer on the Keta Barrier (Ghana) by transient electromagnetic soundings, Journal of Applied Geophysics, doi: 10.1016/j.jappgeo.2006.07.002, 62, 1–15.
21. Thybo, H., Sandrin, A., Nielsen, L., Lykke-Andersen, H., Keller, G. R., 2006. Seismic velocity structure of a large mafic intrusion in the crust of central Denmark from project ESTRID, Tectonophysics, 420, 105–122.
20. Nielsen, L. & Thybo, H., 2006. Identification of crustal and upper mantle heterogeneity by modelling of controlled-source seismic data, Tectonophysics, doi: 10.1016/j.tecto.2005.11.020, 416, 209–228.
19. Nielsen, L., Thybo, H. & Jørgensen, M., 2005. Integrated seismic interpretation of the Carlsberg Fault zone, Copenhagen, Denmark, Geophysical Journal International, 162, 461–478.
18. Nielsen, L., Thybo, H. & Glendrup, M., 2005. Seismic tomographic interpretation of Paleozoic sequences in the southeastern North Sea, Geophysics, 70, R45–R56.
17. Nielsen, L., Boldreel, L. O. & Surlyk, F., 2004. Ground-penetrating radar imaging of carbonate mound structures and implications for interpretation of marine seismic data, AAPG Bulletin, 88, 8, 1069–1082.
16. Nielsen, L. & Thybo, H., 2004. Location of the Carlsberg Fault zone from seismic controlled-source fan recordings, Geophysical Research Letters, 31, L07621, doi: 10.1029/2004GL019603.
15. Nielsen, L. & Thybo, H., 2003. The origin of teleseismic Pn waves: Multiple crustal scattering of upper mantle whispering-gallery phases, Journal of Geophysical Research, 108, B10, 2460, doi:10.1029/2003JB002487.
14. Thybo, H., Nielsen, L. & Perchuc, E., 2003. Seismic scattering at the top of the mantle Transition Zone, Earth and Planetary Science Letters, 216, 259–269.
13. Nielsen, L., Thybo, H., Levander, A. & Solodilov, L., 2003. Origin of upper mantle seismic scattering - evidence from Russian PNE data. Geophysical Journal International, 154, 196–204.
12. Nielsen, L., Thybo, H., Morozov, I. B., Smithson, S. B. & Solodilov, L., 2003. Teleseismic Pn Arrivals: Influence of Upper Mantle Velocity Gradient and Crustal Scattering. Geophysical Journal International, 153, F1–F7.
11. Nielsen, L., Thybo, H. & Egorkin, A. V., 2002. Implications of seismic scattering below the 8° discontinuity along PNE profile Kraton, Tectonophysics, 358, 135–150.
10. Nielsen, L., Thybo, H. & Egorkin, A. V., 2001. Constraints on reflective bodies below the 8° discontinuity from reflectivity modelling. Geophysical Journal International, 145, 759–770.
9. Nielsen, L., Balling, N., Jacobsen, B. H. & MONA LISA Working Group, 2000. Seismic and gravity modelling of crustal structure in the Central Graben, North Sea. Observations along MONA LISA profile 3. Tectonophysics, 328, 229–244.
8. Nielsen, L. & Jacobsen, B. H., 2000. Integrated gravity and wide-angle seismic inversion
for 2-D crustal modelling. Geophysical Journal International, 140, 222–232.
7. Nielsen, L., Thybo, H. & Solodilov, L., 1999. Seismic tomographic inversion of Russian PNE data along profile Kraton. Geophysical Research Letters, 22, 3413–3416.
6. Abramovitz, T., Thybo, H. & MONA LISA Working Group (incl. Lars Nielsen), 1998. Seismic structure of the crust and upper mantle across the Caledonian Deformation Front along MONA LISA profile 1 in the south-eastern North Sea. Tectonophysics, 288, 153–176.
5. Nielsen, L., Klinkby, L. & Balling, N., 1998. Seismic evidence for deep Palaeozoic sedimentary units in the Ringkøbing-Fyn High offshore Denmark. Bull. Geol. Soc. Denmark, 45, 1–10.
4. Nielsen, L., Thybo, H., Klinkby, L., Abramovitz, T. & Balling, N., 1998. Fault detection from back-scattered energy in MONA LISA wide-angle seismic sections from the south-eastern North Sea. First Break, 16, 119–126.
3. MONA LISA Working Group (incl. Lars Nielsen), 1997. MONA LISA - Deep seismic investigations of the lithosphere in the south-eastern North Sea. Tectonophysics, 169, 1–19.
2. MONA LISA Working Group (incl. Lars Nielsen), 1997. Closure of the Tornquist Sea: constraints from MONA LISA deep seismic reflection data. Geology, 25, 1071–1074.
1. Nielsen, L. and Jacobsen, B. H., 1996. Resolution and error propagation analysis for tomographic data with correlated errors. In: Jacobsen, B. H., Mosegaard, K. and Sibani, P. (eds). Inverse Methods, Interdisciplinary Elements of Methodology, Computation and Application, ISBN 3-540-61693-4, Springer-Verlag, 131–138.