GNGTS 2019 - Atti del 38° Convegno Nazionale

12 GNGTS 2019 S essione 1.1 station (SGR), managed by an agreement between the Dipartimento di Scienze Biologiche, Geologiche e Ambientali of the University of Catania and the Municipality of S. Gregorio di Catania. This station SGR, located in San Gregorio di Catania territory, near the Trecastagni Fault, is equipped with a short-period 3-component seismometer. The extensometer stations of the INGV-OE comprise two continuous wire extensometers (Mod Sisgeo D241A20) equipped with a compact data-logger programmed for 48 data/day sampling (Carnazzo et al. , 2006; Gambino et al. , 2011). ET1 was installed in May 2005 directly on a fractured concrete structure, while ET2 was set up in 2007 on the ground after the creation of an 8-meter long and 30-cm deep trench. The two stations measure the relative displacements perpendicular to the fracture (the extensional component). Data. Figure 2a,b shows the seismic activity, in the study area, over the last 19 years and the relative earthquakes daily rate and associated seismic strain release; of note is the scarce seismic activity. Fig. 2 - (a) Epicentral map of earthquakes located in the study area from 2000 to 2019; (b) Relative earthquakes daily rate and associated seismic strain release in the same period. Circle size indicates magnitude, colours indicate range depth.