GNGTS 2013 - Atti del 32° Convegno Nazionale

effective case history of GPR application on the study of geological discontinuity as faults and fractures, but also efficient in the characterization of the related sedimentary structures: the technique is fundamental to provide both suitable “a-priori” information to plan and optimize a further paleoseismological survey and to potentially extend the data on a wider area. This work therefore represents a successful example of how a GPR survey can be for paleoseismological studies, providing a detailed geological model of the subsurface by the interpretation of high- resolution 3D GPR volume and 2D sections, also improved by a basic attributes calculation like in the “Grotta Carbone” case. It represents a valuable tool to detect, though the interpretation of typical radar signature, a Quaternary fault zone and the sedimentary structures, both to define in a non invasive way, the optimal area for future trenches, and to extrapolate complementary information to derive an improved geological model. These detailed results provided on tectonic and stratigraphic information are comparable and complementary with the ones provided by the trenches stratigraphies, therefore suitable to the paleoseismologists to efficiently plan and drive a new trench excavation on the studied Castrovillari site. GPR data can be extensively used where there is a lack of geological information and the results of data interpretation can improve the definition of the seismic hazard of an area, proving a base suitable to plan valid actions for the prevention and the mitigation of the earthquake risks. The interpreted faults can be then potentially added to detailed structural and geological maps thanks to the centimetric accuracy of the geographic coordinates provided by the GNSS receiver linked to a NRTK correction. Acknowledgements. We wish to thank Leonardo Speziali, for his indispensable contribution during the field surveys, Alessandro Maria Michetti and Livio Franz for the preliminary field trip on the study site and for the geological framework provided, the whole Cinti UR for sharing the trench excavation data and Roberto Volpe for the help provided in data acquisition and processing. References Bano M., Edel J.-B., Herquel G. and EPGS class 2001-2002; 2002. Geophysical investigation of a recent shallow fault, The Leading Edge, 21:7, 648-650. Chopra S. and Marfurt K. J.; 2005: Seismic attributes - A historical perspective . Geophysics, 70 :5, 3SO-28SO. Cinti F. 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C.; 2008: Characterization of the shallow structures of active fault zones using 3-D ground-penetrating radar data , J. Geophys. Res., 113 . Michetti A. M., Ferreli L., Serva L. and Vittori E.; 1997: Geological evidence for strong historical earthquakes in an “aseismic” region: The Pollino case (Southern Italy) , Journal of Geodynamics, 24 :1-4, 67-86. Pauselli C., Federico C., Frigeri A., Orosei R., Barchi M.R. and Basile G.; 2010: Ground Penetrating Radar investigations to study active faults in the Norcia Basin (Central Italy) . Journal of Applied Geophysics, 72 :1, 39-45. Valensise, G. and Pantosti D.; 2001: Seismogenic faulting, moment release patterns and seismic hazard along the central and southern Apennines and the Calabrian Arc , G.B. Vai & I.P. Martini (editors), Anatomy of an orogen: the Apennines and adjacent Mediterranean basins. Kluwer Academic Publishers, Dordrecht, 495-512. 175 GNGTS 2013 S essione 1.2