GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 1.1 149 located within the area hit by the 1968 seismic sequence, and close to the epicentres of the most energetic seismic events (M>3.0) occurred in the Belice area during the last 30 years. We also collected GPS data from permanent and episodically surveyed station in SW Sicily with a twofold aim: 1) to retrieve new insights about the geodynamics of this sector of Sicily and 2) to verify the active deformation of the creeping segment already identified by Barreca et al. (2014) between Campobello and Castelvetrano. We re-surveyed the IGM (Istituto Geografico Militare) benchmarks of this area and a new dataset of benchmarks already measured in 2007 by the University of Palermo for cartographic applications. Finally, the SENTINEL 1A TOPSAR Advanced DinSAR analysis covering the 2014-2016 time spanning, confirms the presence of a lineament running NNE-SSW between Campobello and Castelvetrano, showing meaningful LOS displacements. References Barreca G., Bruno V., Cocorullo C., Cultrera F., Ferranti L., Guglielmino F., Guzzetta L., Mattia M., Monaco C., and Pepe F.; 2014: Geodetic and geological evidence of active tectonics in south-western Sicily (Italy) . J. Geodynamics, 82, 138-149. Ferranti L., Burrato P., Forlano S., Di Donato V., and Amore O.F.; 2016: Mid-late Quaternary uplift of the coastal sector between Mazara and Selinunte (SW Sicily): hints on active tectonic structures . Riass. 88 Congresso SGI 2016, Napoli. Rend. Online Soc. Geol. It., 40, suppl. 1, 322. Seismological investigation of the 2016 low magnitude seismic sequence near Baranello (Sannio-Matese area, Southern Apennines - Italy): first results G. Milano Osservatorio Vesuviano – INGV Sezione di Napoli, Italy On January 16, 2016 a low energy earthquake (M L <4.0) occurred SW of Campobasso in the Sannio-Matese area, few kilometres away from Baranello and Busso villages. Intense swarm- type earthquake activity followed this event and lasted for about two weeks. This swarm, which was the most relevant in the Sannio-Matese area after the 2013-2014 sequence, has aroused a remarkable interest both into the scientific community and in the Italian Civil Protection because it is localized near to the seismogenic source of the 1805 earthquake reported in DISS Working Group (2015). The village of Baranello is one of the places where the damages of this earthquake have been estimated with I≥X MCS. As well know in the literature, the Sannio-Matese area is considered one of the most active seismic areas of the Italian peninsula. It is struck by large destructive (Io>X MCS) historical earthquakes (e.g. 1349, M W =7.0; 1688, M W = 6.6; 1805, M W = 6.8; DISS Working Group, 2015; Fig. 1) and the instrumental seismicity of the last 20 years show both the occurrence of low magnitude single events (M L <3.0) and low magnitude seismic sequences and swarms (e.g. Milano, 2014 and references therein). Among these low magnitude seismic sequences, one that has occurred in 1997-98 (M Lmax =4.1) is located in the south-eastern edge of the Matese Massif, between the 1805 and 1688 seismogenic sources. The one that has occurred in 2001 (M Lmax =3.6), instead, took place near the north-western edge of the Matese Massif, in proximity of the NW termination of the 1805 seismogenic source. The epicentres of these sequences are roughly aligned in NNE-SSW direction and the hypocenters are confined between 5 and 15 km in depth. The last relevant seismic sequence occurred between the late 2013-early 2014 following a M L =4.9 earthquake. This sequence struck the internal part of the Matese Massif in an area where no evidence of active faulting has been recorded so far.