GNGTS 2014 - Atti del 33° Convegno Nazionale

GNGTS 2014 S essione 1.1 103 one. The strongest historical earthquakes of the last 1000 years occurred in the Apulian region from Gargano to Salento area were: July 30, 1627 (Gargano, Imax=X MCS); December 8, 1889 (Gargano, Imax=VII MCS); March 20, 1731 (Foggia, Imax=IX MCS); September 10, 1087, (Bari, Imax=VI-VII MCS); May 11, 1560 (Barletta-Bisceglie, Imax=VIII MCS); October 26, 1826 (Manduria, Imax=VI-VII MCS); January 20, 1909 (Nardò, Imax=VI MCS) and February 20, 1743, (Ionian Sea, Imax=IX MCS) (CPTI11, Rovida et al. , 2011; SHEEC, Stucchi et al., 2013, �������� Grünthal et al. , 2013�� �� �� ���������� ���� ��� ����� ����� ���� ��� ). It is noticeable that the 1627, 1731, 1743 and 1889 earthquakes have also generated tsunami phenomena (Maramai et al. , 2014) that caused damages along the Apulian coast. Minor historical seismicity �� ����������� ���������� ��� ������� ���� ���� ��������� ������� is distributed throughout the Salento area with intensity ranging from III to IV degree of the MCS macroseismic scale (CFTIMED04, Guidoboni et al. , 2007). The instrumental recent seismicity in the Salento peninsula ����� �� �� ������ ������������ (Fig. 2) �� ������ ������������ is mainly concentrated in the western sector of the peninsula and in the strait of Otranto. The strongest recorded events occurred on October 20, 1974 (Mw= 5.0; CPTI11, Rovida et al. , 2011� ������� ��� ���� ��� ) October 22, 1976 (Mw =4.9; ������� ������ CPTI11, Rovida et al. , 2011� ��� ��� �� ���� ��� ����� ��� ���� �������� ) and May 7, 1983 (Ml =5.3; CSI 1.1, Castello et al. , 2006) (Fig. 1). Major earthquakes with epicentral zone in the far field. The Salento area suffers the strong earthquakes of neighboring seismogenetic areas as northern Apulia, southern Apennines, Adriatic and Ionian seas, Albania and Greece. ��� ��������� ������������� ������� �� ��� The composite seismogenetic sources of the eastern Mediterranean area are shown in Fig.1 (Basili et al. , 2013)�. It’s well known that earthquakes with epicenter in the central-easternMediterranean (Greece, Ionian Islands) well propagate throughout the Italian peninsula, and in particular in the southern regions, where the intensity degrees are higher, sometimes exceeding the limit of damage. Fig. 2 – Spatial distribution of 1981- 2014 seismicity (CSI, 1.1; http://bollettinosismico.rm.ingv.it/; http://iside. rm.ingv.it/iside/standard/index.jsp) extracted from LabGis, INGV.