GNGTS 2018 - 37° Convegno Nazionale

134 GNGTS 2018 S essione 1.1 southwest of the Matese Massif. Galli and Naso (2009) deeply investigated the southwest side of the Matese Massif and the Venafro Mountains and report geological evidence, augmented by a geomorphological and historical analysis, of rupture episodes that, through absolute dating, they associated with the 1349 earthquake. They proposed the SW dipping 125 striking 22 km length Pozzilli - Capriati al Volturno, named “Aquae Iuliae”, normal fault as responsible for one of the main shocks of the September 1349 earthquake. The study of the micro-seismicity, constituted by low energy sparse events and swarms, can improve the seismotectonics knowledge of an area because can provide specific information on the characterization of active faults and on the present-day state of stress of an area . Considering the recurrence time of the large historical earthquakes in proximity of the Matese Massif and bearing in mind that this area is one of the regions with highest seismogenic potentials of the Italian peninsula, here is analyzed the recent background seismicity of the area. In particular, we focused on the seismicity occurred in proximity of the epicentral area of the 1349 earthquake in order to provide further information on the seismotectonics setting of the southwest sector of the Matese Massif. Data analysis and Results. The study area has been delimited considering the location of Aquae Juliae fault proposed by Galli and Naso (2009) and the location of the 1349 seismogenic source resulting in DISS 3.2.1 (2018). Here is presented the preliminary study of the seismicity limited to 2009-2017 time interval. In this time interval the remarkable quality improvement of Fig. 1 - Map showing the main structural lineaments of the Sannio-Matese area (redraw after CNR-PFG, 1983) on which is reported the epicentral distribution of the seismicity that occurred in the last 20 years (data fromMilano et al. , 2008; Milano, 2016). The rectangles with the years represent the main seismogenic sources of the strong earthquakes that struck the area (DISS Working Group, 2018). The red box with the 1349 seismogenic source resulting in DISS 3.2.1 (2018) denote the study area. In this box the black circles represent the single events whereas red and bleu circles represent the events of the 2010 and 2011 swarms, respectively.