TY - JOUR A1 - Tronicke, Jens A1 - Villamor, P A1 - Green, Alan G. T1 - Detailed shallow geometry and vertical displacement estimates of the Maleme Fault Zone, New Zealand, using 2D and 3D georadar N2 - In an attempt to map the shallow geometry of the Maleme Fault Zone (North Island, New Zealand) and estimate vertical displacements of selected fault strands, we have collected 2D and 3D georadar data using 100 MHz antennae. The 2D data consisted of three parallel georadar lines recorded perpendicular to the axis of the well-defined graben of the Maleme Fault Zone. These similar to 160 in long lines, which were 7.5 m apart, crossed several fault strands on either side of the graben axis. The processed georadar sections revealed two prominent parallel reflections that originated from the boundaries of Late Pleistocene lacustrine and tephra deposits. Distinct vertical offsets of these reflections allowed us to estimate displacernents at individual fault strands across the entire inner graben. The total displacements represented by these offsets was similar to 10-20% greater than that inferred from geomorphological studies, thus demonstrating the limitations of surface observations for determining cumulative fault movements. The 3D georadar data set, recorded across an area of similar to 70x similar to 20 in to one side of the graben axis, provided key details on individual fault strands. For the 3D visualization of fault-related structures, various spatial attribute analyses based on the cosine of the instantaneous phase proved to be useful Y1 - 2006 ER - TY - JOUR A1 - Paasche, Hendrik A1 - Tronicke, Jens A1 - Holliger, Klaus A1 - Green, Alan G. A1 - Maurer, Hansruedi T1 - Integration of diverse physical-property models : subsurface zonation and petrophysical parameter estimation based on fuzzy c-means cluster analyses N2 - Inversions of an individual geophysical data set can be highly nonunique, and it is generally difficult to determine petrophysical parameters from geophysical data. We show that both issues can be addressed by adopting a statistical multiparameter approach that requires the acquisition, processing, and separate inversion of two or more types of geophysical data. To combine information contained in the physical-property models that result from inverting the individual data sets and to estimate the spatial distribution of petrophysical parameters in regions where they are known at only a few locations. we demonstrate the potential of the fuzzy c-means (FCM) clustering technique. After testing this new approach on synthetic data, we apply it to limited crosshole georadar, crosshole seismic, gamma-log, and slug-test data acquired within a shallow alluvial aquifer. The derived multiparameter model effectively outlines the major sedimentary units observed in numerous boreholes and provides plausible estimates for the spatial distributions of gamma-ray emitters and hydraulic conductivity Y1 - 2006 UR - http://geophysics.geoscienceworld.org/ U6 - https://doi.org/10.1190/1.2192927 ER - TY - CHAP A1 - Tronicke, Jens T1 - Patterns in geophysical data and models N2 - Interdisziplinäres Zentrum für Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006 Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7096 ER - TY - BOOK A1 - Tronicke, Jens T1 - Hydrogeophysik : Erkundungen und Sicherung der Ressource Wasser : Antrittsvorlesung 2006-06-01 N2 - Die weltweite Wasserversorgung basiert zu einem überwiegenden Teil auf Grundwasser. Die Erkundung, der Schutz, die nachhaltige Nutzung sowie die eventuelle Sanierung dieser Grundwasserressourcen sind somit global von fundamentalem gesellschaftlichem Interesse. Bei vielen dieser grundwasserbezogenen Fragestellungen ist häufig eine effiziente und detaillierte Charakterisierung des Untergrundes notwendig. Geophysikalische Messverfahren liefern Abbilder der physikalischen Eigenschaften, wie beispielsweise des elektrischen Widerstandes, die wichtige Informationen über den geometrischen und stofflichen Aufbau des verborgenen Untergrundes liefern. In der Vorlesung wird gezeigt, wie die Verfahren der Angewandten Geophysik auf Fragestellungen hinsichtlich der Präsenz, Ausbreitung und Qualität der Ressource Grundwasser eingesetzt werden können. Darüber hinaus werden aktuelle Forschungsthemen und offene Fragen angesprochen. Y1 - 2006 UR - http://info.ub.uni-potsdam.de/multimedia/show_projekt.php?projekt_id=11 PB - Univ.-Bibl. CY - Potsdam ER - TY - JOUR A1 - Boeniger, Urs A1 - Tronicke, Jens A1 - Holliger, Klaus A1 - Becht, Andreas T1 - Multi-offset vertical radar profiling for subsurface reflection imaging JF - Journal of environmental & engineering geophysics : JEEG N2 - The vertical radar profiling (VRP) technique uses surface-to-borehole acquisition geometries comparable to vertical seismic profiling (VSP). Major differences between the two methods do arise due to the fundamentally differing nature of the velocity-depth gradients and transmitter/receiver directivities. Largely for this reason, VRP studies have so far essentially been limited to the reconstruction of velocity-depth profiles by inverting direct arrival times from single-offset VRP surveys. In this study, we investigate the potential to produce high-resolution subsurface reflection images from multi-offset VRP data. Two synthetic data sets are used to evaluate a processing strategy suitably adapted from VSP processing. Despite the fundamental differences between VRP and VSP data, we found that our processing approach is capable of reconstructing subsurface structures of comparable complexity to those routinely imaged by VSP data. Finally, we apply our processing flow to two multi-offset VRP data sets recorded at a well constrained hydrogeophysical test site in SW-Germany. The inferred VRP images are compared with high-quality surface georadar reflection images and lithological logs available at the borehole locations. We find that the VRP images are in good agreement with the surface georadar data and reliably detect the major lithological boundaries. Due to the significantly shorter ray-paths, the depth penetration of the VRP data is, however, considerably higher than that of the surface georadar data. VRP reflection images thus provide an effective means for the depth-calibration and extension of conventional surface georadar data in the vicinity of boreholes. Y1 - 2006 U6 - https://doi.org/10.2113/JEEG11.4.289 SN - 1083-1363 VL - 11 IS - 4 SP - 289 EP - 298 PB - EEGS CY - Denver ER - TY - JOUR A1 - Hellmann, Uwe A1 - Rettweiler, Udo A1 - Kramer, Annette A1 - Zehe, Erwin A1 - Jacob, Andreas A1 - Hafner, Johann Evangelist A1 - Tronicke, Jens A1 - Mühle, Ralf-Udo A1 - Klauss, Susanne A1 - Dietrich, Larissa A1 - Richter, Norbert A1 - Schweigl, Kerstin T1 - Portal = Ressource Wasser: Mehr als ein Elixier des Lebens BT - Die Potsdamer Universitätszeitung N2 - Aus dem Inhalt: - Ressource Wasser: Mehr als ein Elixier des Lebens - Dorniges hinter Glas - Die Profstars 2007 - Technik gegen unerwünschte Mithörer entwickelt T3 - Portal: Das Potsdamer Universitätsmagazin - 04-05/2007 Y1 - 2007 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-440051 SN - 1618-6893 IS - 04-05/2007 ER - TY - JOUR A1 - Belina, Florian A. A1 - Dafflon, Baptiste A1 - Tronicke, Jens A1 - Holliger, Klaus T1 - Enhancing the vertical resolution of surface georadar data N2 - There are far-reaching conceptual similarities between bi-static surface georadar and post-stack, "zero-offset" seismic reflection data, which is expressed in largely identical processing flows. One important difference is, however, that standard deconvolution algorithms routinely used to enhance the vertical resolution of seismic data are notoriously problematic or even detrimental to the overall signal quality when applied to surface georadar data. We have explored various options for alleviating this problem and have tested them on a geologically well-constrained surface georadar dataset. Standard stochastic and direct deterministic deconvolution approaches proved to be largely unsatisfactory. While least-squares-type deterministic deconvolution showed some promise, the inherent uncertainties involved in estimating the source wavelet introduced some artificial "ringiness". In contrast, we found spectral balancing approaches to be effective, practical and robust means for enhancing the vertical resolution of surface georadar data, particularly, but not exclusively, in the uppermost part of the georadar section, which is notoriously plagued by the interference of the direct air- and groundwaves. For the data considered in this study, it can be argued that band- limited spectral blueing may provide somewhat better results than standard band-limited spectral whitening, particularly in the uppermost part of the section affected by the interference of the air- and groundwaves. Interestingly, this finding is consistent with the fact that the amplitude spectrum resulting from least-squares-type deterministic deconvolution is characterized by a systematic enhancement of higher frequencies at the expense of lower frequencies and hence is blue rather than white. It is also consistent with increasing evidence that spectral "blueness" is a seemingly universal, albeit enigmatic, property of the distribution of reflection coefficients in the Earth. Our results therefore indicate that spectral balancing techniques in general and spectral blueing in particular represent simple, yet effective means of enhancing the vertical resolution of surface georadar data and, in many cases, could turn out to be a preferable alternative to standard deconvolution approaches. Y1 - 2009 UR - http://www.sciencedirect.com/science/journal/09269851 U6 - https://doi.org/10.1016/j.jappgeo.2008.08.011 SN - 0926-9851 ER - TY - JOUR A1 - Dietrich, Peter A1 - Tronicke, Jens T1 - Integrated analysis and interpretation of cross-hole P- and S-wave tomograms : a case study N2 - We present cross-hole P- and S-wave seismic experiments that have been performed along a similar to 100 m long transect for the detailed characterization of a contaminated sedimentary site (Bitterfeld research test site, Germany). We invert the corresponding first break arrival times for the P- and S-wave velocity structure and compare two different strategies to interpret these models in terms of pertinent lithological and geotechnical parameter variations. The first (common) approach is based on directly translating the tomographic velocity models into the parameters of interest (e.g., elastic moduli). The second (zonal) approach first reduces the tomographic parameter information to a limited number of characteristic velocity combinations via k-means cluster analysis. Then, for each zone (cluster) further parameters including uncertainties can be estimated. In the presented case study, Our results indicate that the zonal approach provides an effective means for the integrated interpretation of different co-located data. Y1 - 2009 UR - http://nsg.eage.org/ U6 - https://doi.org/10.3997/1873-0604.2008041 SN - 1569-4445 ER - TY - JOUR A1 - Boeniger, Urs A1 - Tronicke, Jens T1 - Improving the interpretability of 3D GPR data using target-specific attributes : application to tomb detection N2 - Three-dimensional (3D) ground-penetrating radar (GPR) represents an efficient high-resolution geophysical surveying method allowing to explore archaeological sites in a non-destructive manner. To effectively analyze large 3D GPR data sets, their combination with modern visualization techniques (e.g., 3D isoamplitude displays) has been acknowledged to facilitate interpretation beyond classical time-slice analysis. In this study, we focus on the application of data attributes (namely energy, coherency, and similarity), originally developed for petroleum reservoir related problems addressed by reflection seismology, to emphasize temporal and spatial variations within GPR data cubes. Based on two case studies, we illustrate the potential of such attribute based analyses towards a more comprehensive 3D GPR data interpretation. The main goal of both case studies was to localize and potentially characterize tombs inside medieval chapels situated in the state of Brandenburg, Germany. By comparing the calculated data attributes to the conventionally processed data cubes, we demonstrate the superior interpretability of the coherency and the similarity attribute for target identification and characterization. Y1 - 2010 UR - http://www.sciencedirect.com/science/journal/03054403 U6 - https://doi.org/10.1016/j.jas.2009.09.049 SN - 0305-4403 ER - TY - JOUR A1 - Boeniger, Urs A1 - Tronicke, Jens T1 - Improving the interpretability of 3D GPR data using target-specific attributes : application to tomb detection (vol 37, pg 360, 2009) N2 - Publisher's not Y1 - 2010 UR - http://www.sciencedirect.com/science/journal/03054403 U6 - https://doi.org/10.1016/S0305-4403(10)00046-4 SN - 0305-4403 ER -