GNGTS 2014 - Atti del 33° Convegno Nazionale

GNGTS 2014 S essione 1.1 79 Spampinato C.R., Ferranti L., Monaco C., Scicchitano G. and Antonioli F.; 2014: Raised Holocene paleo-shorelines along the Capo Vaticano coast (western Calabria, Italy): Evidence of co-seismic and steady-state deformation . J. Geodyn., http://dx.doi.org/10.1016/j.jog.2014.03.003. Tortorici L., Monaco C., Tansi C. and Cocina O.; 1995: Recent and active tectonics in the Calabrian Arc (Southern Italy) . Tectonophysics, 243 , 37-49. Tortorici G., Bianca M., Monaco C., Tortorici L., Tansi C., De Guidi G. and Catalano S.; 2002; Quaternary normal faulting and marine terracing in the area of Capo Vaticano and S. Eufemia Plain (Southern Calabria). Studi Geologici Camerti, 1 , 155-171. Tortorici G., Bianca M., De Guidi G., Monaco C. and Tortorici L.; 2003: Fault activity and marine terracing in the Capo Vaticano Area (Southern Calabria) during the MiddleeLate Quaternary . �� Quaternary International, 101-102 , 269-278. SEISMOLOGICAL INVESTIGATION OF THE 2013 – 2014 SEISMIC SEQUENCE OF THE MATESE MASSIF (SOUTHERN APENNINES, ITAL G. Milano Osservatorio Vesuviano – Sezione di Napoli INGV, Napoli, Italy Introduction. �� The degree of knowledge about the location of the active faults, as well as the relation between the occurrence of seismic sequence and the regional tectonics, is at present matter of studies for the Apennines Chain. The increasing number of seismic stations running in the Apennine Chain in the last 15 years, ensure also accurate earthquake locations and focal mechanism solutions of low-magnitude earthquakes (M < 2.5). These seismological data yield some new information on active earthquake faults, their kinematics and on strain deformation. �� The study of the background seismicity, in particular those of low and moderate seismic sequences, can provide significant information towards the comprehension of rupture mechanism of the faults that can generate large earthquakes. This is of particular relevance for regions in which large historical earthquakes, suspended by long quiescence time periods, occurred. In the Apennine Chain, a region with the above characteristics is the Sannio-Matese. Between the end of December 2013 and January 2014 a seismic sequence, started with a M L = 4.9 earthquake, affected the southern side of the Matese Massif. �� The main shock was felt in a vast area, with the largest MCS intensities located to the south of the Matese Massif. This sequence �� struck the internal part of the Massif �� where no remarkable seismic events were located in the previous years. The sequence (red ellipse in Fig. 1) is located in between the macroseismic epicentral areas of historical destructive events with 6.5 ≤ Mw ≤ 7.0; further, it occurred less than 20 km far from the area where 15 years before a different low-energy seismic sequence took place. Here, a seismological investigation of the sequence is carried out using standard methods already used to study the seismicity of the area. The aim is to document the sequence and to valuate, if any, the main differences with the previous seismicity in order to provide a contribution to deepen the knowledge of the area. The seismicity of the area. The Sannio-Matese area (Fig. 1), extending between southern Abruzzi and northern Campania administrative Regions, represents one of the most seismically active segments of theApennines chain. This area includes the towns of Isernia and Campobasso to the North and Benevento to the SE (Fig. 1). In terms of seismic-hazard evaluation, this sector of the Apennines is considered one of the most dangerous region of Italy since, during the historical period, it was hit many times by highly destructive earthquakes with I 0 > IX MCS, as well as by low-energy seismic sequences and swarms. Notable historical earthquakes, separated by long periods of relative quiescence, occurred in 1349, 1688, 1702, 1732, 1805. These events nucleated along NW-SE striking faults whose kinematics is consistent with the