Geoelectrics & Electromagnetics

The section conducts experimental and theoretical research to image the subsurface structure and to characterize processes that change the subsurface using electromagnetic methods. Imaging und chracterization therefore base on the physical properties electrical conductivity, dielectric permitivity and magnetic permeability.

Research

The research of section 2 aims on the advancement of existing and the development of new electromagnetic methods. We focus our work on improving the ability to image dynamic processes such as the spatial and temporal variation of the salt/fresh water interface in coastal regions. Further, we develop scale- and method-independent approaches to enhance the reliability of parameter distributions used to inform subsurface modeling. Finally, we deliver high-resolution subsurface models to allows for sedimentological investigations.  

Within the research field of Geoelectrics we target on the dc-resistivity method. Of special interest are large-scale layouts and monitoring experiments as well as developing data interpretation software. The research field surface-NMR advances the technique to conduct NMR experiments by using large coils placed at the Earths surface that allows for deriving hydrological parameter. The Georadar group conducts research in the field of high-frequency electromagnetic wave to investigate groundwater-systems, sedimentological questions and the detection of explosive ordnances.  The developments in the fields of measurement equipment as well as modeling and inversion technqiues are focussed on the above mentioned methods while the modeling and inversion group deals with handling partial differential equations, mainly maxwells-equations. Further they develop modern inverse modeling approaches and data-processing algorithms.

Research fields

Selected current projects

  • DESMEX
    Deep Electromagnetic Soundings for Mineral EXploration
  • COMET
    COupled Magnetic Resonance and Electrical Resistivity Tomography
  • MoreSpin
    Mobile Magnetic Resonance Sensor with supraconducting coil for prepolarization in the near surface soil 
  • Counter-IED 2 
    Generation of synthetic sample data for the detection of explosive ordnances with GPR

All projects

Current publications

  • A remote-control datalogger for large-scale resistivity surveys and robust processing of its signals using a software lock-in approach. - Geoscientific Instrumentation, Methods and Data Systems, 7, 55-66.
    2018, OPPERMANN, F. & GÜNTHER, T.
  • Visualisation and analysis of shear-deformation bands in unconsolidated Pleistocene sands using ground-penetrating radar. - Sedimentary Geology, 367, 135-145.
    2018, BRANDES, C., IGEL, J., LOEWER, M., TANNER, D., LANG, J., MÜLLER, K. & WINSEMANN, J.
  • Enabling surface nuclear magnetic resonance at high noise environments using a pre-polarization pulse. - Geophysical Journal International, 212 (2), 1463–1467.
    2018, LIN, T., YANG, Y.,TENG,F., MÜLLER-PETKE, M.
  • Stochastic regularisation of the geophysical inverse problem on unstructured meshes. - Geoph. J. Int., 213, 1374-1386.
    2018, JORDI, C., DOETSCH, J., GÜNTHER, T., SCHMELZBACH, C. & ROBERTSON, J.
  • pyGIMLi: An open-source library for modelling and inversion in geophysics. - Computers & Geosciences, 109, 106-123.
    2017, RÜCKER, C., GÜNTHER, T. & WAGNER, F.
  • Ultra-broadband electrical spectroscopy of soils and sediments – A combined permittivity and conductivity model. - Geophysical Journal International, (2017) 210, 1360–1373
    2017, LOEWER, M., GÜNTHER, T., IGEL, J., KRUSCHWITZ, S., MARTIN, T. & WAGNER, N.

Head of department (acting)

Dr. Mike Müller-Petke
 +49 511 643-3253

Staff

Technical infrastructure