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Summary of Proposal GEO0502

TitleDetermination of seismic deformation, fault scarps and tectonically induced mass movements at Lake Ohrid Basin.
Investigator Hoffmann, Nadine - RWTH Aachen University, Neotectonics and Natural Hazards RWTH AAchen University
Team Member
Prof. Dr. Reicherter, Klaus - RWTH Aachen University, Neotectonics and Natural Hazards
M.A. Hoffmann, Nadine - RWTH Aachen University, Neotectonics and Natural Hazards
Dipl. Geophys. Grützner, Christoph - RWTH Aachen University, Neotectonics and Natural Hazards
Dr. Fernandez-Steeger, Tomas - RWTH Aachen University, Lehrstuhl für Ingenieurgeologie und Hydrogeologie
Dipl. Geograph. Wiatr, Thomas - RWTH Aachen University, Neotectonics and Natural Hazards
SummaryIn the frame of the proposed project we plan to perform detailed structural and fault analysis of Lake Ohrid and its surrounding. These objectives can only be achieved by combining field work with remote sensing data. Specific goals of the project are: • Acquisition and processing of onshore data at Lake Ohrid: An onshore data acquisition includes GPR-measurements, Ohm-Mapping (resistivity) and percussion drilling in areas, which were covered by the lake in the past. • Analysis of faults and fault systems and their relation to regional tectonic structures: The analysis of these structures in the field and on remote sensing data will allow the reconstruction of the tectonic evolution of Ohrid area. • Paleostress analysis: Fault-slip data, obtained from the mountains surrounding Lake Ohrid are used to unravel the paleostress history of the area. • Tectonic geomorphology and paleoseismology: Quantitative measurements of geomorphic indices are used as a reconnaissance tool to identify areas experiencing tectonic deformation. A quantification of the present-day landscape shape is used to characterize the balance between erosion, subsidence, uplift and tectonics in the Lake Ohrid area, including an evaluation of the drainage system, which may record the tectonic evolution. A combination of the mentioned tools in the field work and the work on remote sensing data is crucial to gain a wide spectrum of different data sets. This multimethod approach provides the possibility to achieve a more complex picture of the tectonical evolution of Lake Ohrid. Methods: • Onshore percussion coring • Ground Penetrating Radar, Ohm-Mapper • Paleostress analysis • Tectonic geomorphology • LiDAR • Remote sensing data (Terrasar X) With high-resolution remote sensing data we will be able to determine interesting drilling, trenching and mapping sites and we can investigate and analyse structures on the DEM, that are not accessible in the field. Furthermore we will be able to carry out a lot of research on the DEM´s measuring different parameters, such as Sinuosity indices, slope cross profiles, slope gradient, mountain-front valley shape index, stream gradient changes, triangular facets. But also will provide us with the data to calculate the eroded volumes of rock or deposited landslides. The data reqirements therefore are DEM´s with a very high resolution to ensure exact results. We also want to show how much the results improve using TerraSar X data instead of 1arc sec data. The conclusions drawn out of the analysis of these data should be a precise model of the seismic evolution of the lake. Especially geomorphological indices can provide a good idea of the landscape evolution and might support our ideas about the timescale of extension and compression phases. We also will be able to verify the TerraSar X data with our LiDAR scans, that can be included in a DEM and therefore provide an even higher resolution in particular areas of the investigation area.

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