@article{AllroggenBoothBakeretal.2019,
  author    = {Allroggen, Niklas Robin and Booth, Adam D. and Baker, Sandra E. and Ellwood, Stephen A. and Tronicke, Jens},
  title     = {High-resolution imaging and monitoring of animal tunnels using 3D ground-penetrating radar},
  series = {Near surface geophysics},
  volume    = {17},
  journal   = {Near surface geophysics},
  number    = {3},
  publisher = {Wiley},
  address   = {Hoboken},
  issn      = {1569-4445},
  doi       = {10.1002/nsg.12039},
  pages     = {291 -- 298},
  year      = {2019},
  abstract  = {Ground-penetrating radar is widely used to provide highly resolved images of subsurface sedimentary structures, with implications for processes active in the vadose zone. Frequently overlooked among these structures are tunnels excavated by fossorial animals (e.g., moles). We present two repeated ground-penetrating radar surveys performed a year apart in 2016 and 2017. Careful three-dimensional data processing reveals, in each data set, a pattern of elongated structures that are interpreted as a subsurface mole tunnel network. Our data demonstrate the ability of three-dimensional ground-penetrating radar imaging to non-invasively delineate the small animal tunnels (similar to 5 cm diameter) at a higher spatial and geolocation resolution than has previously been achieved. In turn, this makes repeated surveys and, therefore, long-term monitoring possible. Our results offer valuable insight into the understanding of the near-surface and showcase a potential new application for a geophysical method as well as a non-invasive method of ecological surveying.},
  language  = {en}
}
@article{GuillemoteauSimonHulinetal.2019,
  author    = {Guillemoteau, Julien and Simon, Francois-Xavier and Hulin, Guillaume and Dousteyssier, Bertrand and Dacko, Marion and Tronicke, Jens},
  title     = {3-D imaging of subsurface magnetic permeability/susceptibility with portable frequency domain electromagnetic sensors for near surface exploration},
  series = {Geophysical journal international},
  volume    = {219},
  journal   = {Geophysical journal international},
  number    = {3},
  publisher = {Oxford Univ. Press},
  address   = {Oxford},
  issn      = {0956-540X},
  doi       = {10.1093/gji/ggz382},
  pages     = {1773 -- 1785},
  year      = {2019},
  abstract  = {The in-phase response collected by portable loop-loop electromagnetic induction (EMI) sensors operating at low and moderate induction numbers (<= 1) is typically used for sensing the magnetic permeability (or susceptibility) of the subsurface. This is due to the fact that the in-phase response contains a small induction fraction and a preponderant induced magnetization fraction. The magnetization fraction follows the magneto-static equations similarly to the magnetic method but with an active magnetic source. The use of an active source offers the possibility to collect data with several loop-loop configurations, which illuminate the subsurface with different sensitivity patterns. Such multiconfiguration soundings thereby allows the imaging of subsurface magnetic permeability/susceptibility variations through an inversion procedure. This method is not affected by the remnant magnetization and theoretically overcomes the classical depth ambiguity generally encountered with passive geomagnetic data. To invert multiconfiguration in-phase data sets, we propose a novel methodology based on a full-grid 3-D multichannel deconvolution (MCD) procedure. This method allows us to invert large data sets (e.g. consisting of more than a hundred thousand of data points) for a dense voxel-based 3-D model of magnetic susceptibility subject to smoothness constraints. In this study, we first present and discuss synthetic examples of our imaging procedure, which aim at simulating realistic conditions. Finally, we demonstrate the applicability of our method to field data collected across an archaeological site in Auvergne (France) to image the foundations of a Gallo-Roman villa built with basalt rock material. Our synthetic and field data examples demonstrate the potential of the proposed inversion procedure offering new and complementary ways to interpret data sets collected with modern EMI instruments.},
  language  = {en}
}
@misc{HugenschmidtGiannopoulosTronicke2019,
  author    = {Hugenschmidt, Johannes and Giannopoulos, Antonios and Tronicke, Jens},
  title     = {Foreword},
  series = {Near surface geophysics},
  volume    = {17},
  journal   = {Near surface geophysics},
  number    = {3},
  publisher = {Wiley},
  address   = {Oxford},
  issn      = {1569-4445},
  doi       = {10.1002/nsg.12050},
  pages     = {199 -- 200},
  year      = {2019},
  language  = {en}
}