GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.1 GNGTS 2024 Detecton capability of earthquakes by a hydraulic pressure device in the Gran Sasso aquifer (central Italy) D. Isaya 1 , G. De Luca 2 , M. Tallini 1 1 Dipartmento di Ingegneria Civile, Edile-Architetura e Ambientale, Università degli Studi dell'Aquila 2 Isttuto Nazionale di Geofsica e Vulcanologia 1. Introducton The Gran Sasso aquifer (GSA) can be considered paradigmatc of the fssured-karst carbonate ones of the Mediterranean domain as concerns also the Earthquake Hydrology topic because ( i ) it is crossed by several actve faults, ( ii ) it is placed in central Italy characterized by high Seismic hazard and ( iii ) it hosts the INFN underground laboratory (UL). UL is a strategic site for studying aquifer versus earthquakes because it represents a unique “window” within the deep saturated zone located in the GSA core which has above a very thick unsaturated zone (more than a thousand of meters). Therefore, UL rock mass volume is not involved by shallow hydrological processes and this opportunity generally it is very rare to fnd. For these consideratons, UL was used to monitor groundwater parameters in the inter-, co- and post-seismic period above all of the recent 2009 L’Aquila earthquake and the 2016-2017 Central Italy seismic sequence (Adinolf Falcone et al., 2012; De Luca et al., 2016; 2018; Petta and Tallini, 2002). As stated, we present further data concerning the estmaton of the detecton capacity of earthquakes by a hydraulic pressure device (in the following HPD) installed in the boreholes S13 and S14 (for their locaton see Fig. 1) by comparing earthquake detected by the INGV seismic staton GIGS, placed in UL. The HPD measures at very high frequency (20 Hz) the hydraulic pressure and the boreholes S13 and S14 are located very near to UL. Moreover, the detecton capability of earthquakes by the HPD installed in the boreholes S13 and S14 was compared to that due to earthquake-induced hydrological phenomena (liquefacton, stream discharge increase, mud