GNGTS 2017 - 36° Convegno Nazionale

142 GNGTS 2017 S essione 1.2 ipsometric curve that about 10 basins are in a rejuvenation stage, while 3 basins have reached their balance between erosion and deposition. Finally, the remaining 9 basins show a multiform pattern, both a juvenile and a senile stage. These results can be influenced by the erosion resistance of the outcropping lithologies, creating disequilibria on the Strahler curve. Conclusions. GNSS measurements started in October 2016 and establish the “point 0” of the geodetic evolution of the area. The aim of these measures is to detect any surface movements in the Maccalube area (Fig. 2), and by GIS analysis to understand the relative horizontal movements of the soil portions by comparing the structures detected by the Civil Protection technicians immediately after the event Of 2008 (Report DPC UOB XXX, 2008). In relation to the measured displacement rates, it is not yet possible indicate what are the geometric parameters and modular displacement because it is a function of the order of magnitude of the instrument error which for this measure is in the order of 1.5 centimetres. However, the vectors indicate a homogeneous trend, but the module still falls into the error, so we can confirm this deformation only in subsequent surveys. According to Bonini (2012) a model for this specific area was carried out (Fig 3) which show the relationship between sedimentary vulcanism and compressive tectonics. In conclusion both the hydrographic pattern analysis and slope variations show the existence of a transient state of the landscape. All the data confirm the recent activity of the Sicilian Basal Thrust (Lavecchia et al. , 2007) in the study area, show by the presence of deep and surface earthquakes along this structure, by lifting of the area along the anticline folds and thrust, by the deepening of river basins in the uplifting areas and by the sedimentary volcanism of the Maccalube of Santa Barbara that is presumably linked to the recent activity of the compressive tectonic. References Accaino, F., Catalano, R., Di Marzo, L., Giustiniani, M., Tinivella, U., Nicolich, R., Sulli, A., Valenti, V., Manetti, P., 2011. A crustal seismic profile across Sicily. Tectonophysics 508, 52–61. doi:10.1016/j.tecto.2010.07.011 Bello, M., Franchino, A., Merlini, S., 2000. Structural model of Eastern Sicily. Mem. Soc. Geol. Ital. 55, 61–70. Bonini, M., 2012. Mud volcanoes: Indicators of stress orientation and tectonic controls. Earth-Science Rev. 115, 121–152. doi:10.1016/j.earscirev.2012.09.002 Catalano, R., Valenti, V., Albanese, C., Accaino, F., Sulli, a., Tinivella, U., Gasparo Morticelli, M., Zanolla, C., Giustiniani, M., 2013. Sicily’s fold-thrust belt and slab roll-back: the SI.RI.PRO . seismic crustal transect. J. Geol. Soc. London. 170, 451–464. doi:10.1144/jgs2012-099 Fig. 3 - Synthetic model of the Santa Barbara mud volcano on the left and the schematic model of mud volcano created by Bonini et al. (2012)