GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.2 - POSTER GNGTS 2023 The methodological approach used to study the subsidence, together with the availability of large datasets of multi-temporal InSAR products, can provide insights into the understanding of the relationship between faulted bedrock organization, fault activity and the deforming valley deposits filling the extensional basins (Murgia et al., 2020; Hu et al., 2019; Brunori et al., 2015). the position of the subsidence shifted to the west with respect to the axis of the valley as well as the position of the fluvial axis which flows on the western side of the valley, suggesting a prevalent activity of the Eastern faults dipping to the NE by respect the western fault system dipping toward SW (Fig. 2c). This activity could, therefore, be responsible for local historical earthquakes. The maximum thickness of the local recent alluvial sediments is estimated in this area at about 150 m (Famiani et al., 2020) could indicating a relatively high regional subsidence rate of the hanging-wall block and suggesting that the basin-bounding faults are capable to counteract the regional uplift (Melelli et al., 2014). Further studies are needed throughout the Valle Umbra to investigate the response of the soil to artificial variations in the groundwater level due to over-pumping and to understand whether the compaction of the deep aquifer is going to lead to a decrease in available water resources. Moreover, the analysis of the quaternary and recent deposits filling the valley is mandatory for the knowledge of the fault dissecting the valley bedrock and their seismic potential. References Beretta, G. P., Avanzini, M., Marangoni, T., Burini, M., Schirò, G., Terrenghi, J., & Vacca, G. (2018). Groundwater modelling of the withdrawal sustainability of Cannara artesian aquifer (Umbria-Italy). ACQUE SOTTERRANEE, 7(3), 47-60. DOI: 10.7343/as-2018-333 Brunori C.A., Bignami C. Albano M., Zucca F. Samsonov S., Groppelli G. Norini G. Saroli M., Stramondo S. (2015), Land subsidence, Ground Fissures and Buried Faults: InSAR Monitoring of Ciudad Guzmán (Jalisco, Mexico). Remote Sens. 2015, 7, 8610-8630; doi:10.3390/rs70708610 Bucci, F., Mirabella, F., Santangelo, M., Cardinali, M., Guzzetti, F.; Photogeology of the Montefalco Quaternary basin, Umbria, Central Italy. Journal of Maps, ISSN: 1744-5647, DOI: 10.1080/ 17445647.2016.1210042. Centamore E., Deiana G., Micarelli A., Potetti M. (1986) - Il Trias-Paleogene delle Marche. Studi Geologici Camerti, Vol. Spec. “La geologia delle Marche”: 9-27. Famiani D., Brunori C.A., Pizzimenti L., Cara F., Caciagli M., Melelli L., Mirabella F., Barchi M. R. (2020). Geophysical reconstruction of buried geological features and site effects estimation of the Middle Valle Umbra basin (central Italy). Engineering Geology, 105543. https://doi.org/10.1016/j.enggeo.2020.105543 GE.MI.NA . (1962) – “Ligniti e torbe dell‘Italia continentale”. Geomin- eraria Nazionale, 319 pp., Roma.