GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 1.1 109 has been hit by two seismic sequences in the 1974 (Mwmax=5.0) and 1976 (Mwmax=4.9). The increase in the number of seismic stations since 2000 provides a more complete hypocentral determinations of low magnitude earthquakes occurring in the Apulia foreland (Del Gaudio et al. , 2005; Pierri et al. , 2013). The distribution of earthquakes in the Salento Peninsula shows a clear concentration of seismic events along the NE-SW Taranto-Brindisi depression zone separating the Murge from the Salento Peninsula (Fig 1). The Salento area is hit by several strong earthquakes of neighbouring seismogenetic areas as northern Apulia, southern Apennines, Adriatic and Ionian sea, Albania and Greece (Fig. 1). The strongest historical earthquakes with I 0 ≥VIII MCS (Rovida et al. , 2011, 2016) in the Gargano area are: • the 1223 (Gargano, I 0 =VIII-IX MCS, Mw=5.8); • the July 17, 1361 (Subappennino dauno, I 0 =IX MCS, Mw=6.0 ); • the 1414 (Gargano, I 0 =VIII-IX, Mw=5.8 ); • the May 11, 1560 (Costa pugliese centrale I 0 =VIII MCS, Mw=5.7 ); • the July 30, 1627 (Capitanata, I 0 =X MCS, Mw=6.7 ); Fig. 1 – Historical seismicity of Apulia and surrounding areas: red squares represents earthquakes from the CPTI11catalogue (Rovida et al. , 2011, 2016) for Southern Italy and from the SHARE European Earthquake Catalogue (Stucchi et al. , 2013; Grünthal et al. , 2013) for the Balkan peninsula; red squares, with full red circles inside, represent earthquakes of Salento peninsula from CFTI4Med catalogue (Guidoboni et al. , 2007). The epicentre of the 1743 earthquake located onland (from CFTI4Med) and offshore (from CPTI11) in the Otranto Channel, is identified by the year of its occurrence. Instrumental seismicity of Apulia and surrounding areas: yellow circles represent earthquakes from ISIDE Working group (2016) (modified after Nappi et al. , 2016).