GNGTS 2014 - Atti del 33° Convegno Nazionale

38 GNGTS 2014 S essione 1.1 is “inferred” at the base of an up to 25 meters high fault scarp that displaces the flat surface of a recent alluvial terrace (Figs. 1 and 2). ��������� �� ����� According to Galli et al. (2010), coseismic surficial breaks occurred all along the fault trace during the 2009 earthquake, both along the segment crossing the San Demetrio downtown, and along other en echelon splays. This short note summarizes the results of the paleoseismological investigations carried out Fig. 1 – A) Oblique view (based on a 20 m DTM) of the L’Aquila region with the net of capable faults. Legend: 1) Primary fault; 2) Secondary fault. B) Detailed geological map of S. Demetrio ne’ Vestini, from a 1:5000 scale original (modified after Working Group MS–AQ, 2010). Legend: 1) Colluvial and debris deposits (Holocene); 2) Alluvial fan gravels and sands (upper part of Middle Pleistocene); 3) Sands (upper part of Middle Pleistocene); 4) Fan delta conglomerates (Lower to Middle Pleistocene); 5) Whitish silty lacustrine deposits (Lower to Middle Pleistocene); 6) Inferred trace of capable faults; 7) Fault scarp edge; 8) location of the cross section shown in Fig. 2B; 9) Trace of the paleoseismological trench.