GNGTS 2014 - Atti del 33° Convegno Nazionale

204 GNGTS 2014 S essione 2.2 In this scenario, Lampedusa ���������� � ����� ����� ���������� ������ �� ������� represents a small horst structures formed by Neogene –Quaternary carbonate sequences (Grasso and Pedley, 1985) characterized by the following lithologic unit: carbonate lithoclast breccias of late Pleistocene-Holocene age; Aeolian dunes formed of bioclastic grainstones of late Pleistocene; wave-cut platform and sand raised beaches (late Pleistocene, Tyrrhenian); bioclastic grainstones (early Pleistocene); limestones of the Lampedusa Formation that is constituted by the Vallone della Forbice, Capo Grecale and Cala Pisana members of Tortonian–Early Messinian age (see Fig. 1a). ��������� ������ ��� ������ Following Grasso and Pedley (1985), major tectonic lineaments of were found in the eastern part of the island. Structural measurements performed along the cliff revealed that the area is deformed by a NW-SE oriented wrench zone [Cala Creta fault, see Grasso and Pedley (1985)] composed of sub-vertical fault segments accompanied by damaged zone consisting of fractures with pervasive pattern. Faults consist mostly of NW-SE oriented and SW-dipping reverse structures with slickensides on planes indicating a left-lateral component of motion. Another tectonic lineaments (Aria Rossa fault), occur in the central part of the island. It consist of a NW-SE oriented fault with no evident fault plane but a series of second order fractures and a topographic irregularity with a quite sharp change in the outcropping lithology. Fig. 1 – a) geologic map of the Lampedusa island (modified from Grasso and Pedley 1985); b) location of ambient noise recording sites.