“Geophysical paleoseismology” through high resolution GPR data: A case of shallow faulting imaging in Central Italy |
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| Institution: | 1. Università degli Studi di Perugia, Dipartimento Scienze della Terra, Piazza dell''Università 1, 06100 Perugia, Italy;2. Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica, via del Fosso del Cavaliere, 100-00133 Roma, Italy;3. University of Trieste, Dept. of Mathematics and Geosciences, Via Weiss 1, Pal. C, 34128 Trieste — Italy;1. RWTH Aachen University, Institute of Neotectonics and Natural Hazards, Lochnerstr. 4-20, 52064 Aachen, Germany;2. Laboratory of Mineralogy & Geology, Department of Natural Resources Development and Agricultural Engineering, Agricultural University of Athens, 75 Iera Odos Str., 11855 Athens, Greece;3. RWTH Aachen University, Department of Engineering Geology and Hydrogeology, Lochnerstr. 4-20, 52064 Aachen, Germany;1. GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany;2. Formerly, Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655 Hannover, Germany;3. Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655 Hannover, Germany;4. Amberg Technologies AG, Trockenloostrasse 21, 8105 Regensdorf, Switzerland;1. Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran;2. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran;3. Institute of Geophysics, University of Tehran, Tehran, Iran;4. Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran;5. Seismic Data Processing Department, Dana Geophysics Company, Tehran, Iran |
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| Abstract: | In this work we report a GPR study across a tectonic discontinuity in Central Italy. The surveyed area is located in the Castelluccio depression, a tectonic basin in the Central Apennines, close to the western border of the Mt. Vettore. Its West flank is characterised by a set of W-dipping normal faults, considered active and capable of generating strong earthquakes (Mw = 6.5, Galli et al., 2008). A secondary fault strand, already studied with paleo-seismological analysis (Galadini and Galli, 2003), has been observed in the Quaternary deposits of the Prate Pala alluvial fan. We first defined the survey site using the data available in literature and referring to topographic and geological maps, evaluating also additional methodologies, such as orthophoto interpretation, geomorphologic analysis and integrating all the information in a GIS environment. In addition, we made extensive use of GPR modelling, reproducing the geometric characteristics of the inferred fault area and interpreting the synthetic profiles to recognise local geophysical indications of faulting on the radargrams. Finally, we performed a GPR survey employing antennas with different frequencies, to record both 2D Common Offset profiles and Common Mid Point (CMP) gathers for a more accurate velocity estimation of the investigated deposits. In this paper we focus on the evaluation of the most appropriated processing techniques and on data interpretation. Moreover we compare real and synthetic data, which allow us to better highlight some characteristic geophysical signatures of a shallow fault zone. |
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