GNGTS 2014 - Atti del 33° Convegno Nazionale

GNGTS 2014 S essione 2.2 203 Lanzo G., Pagliaroli A., Scasserra G., Iasiello P., Capozucca F.; 2014: Studi di geotecnica sismica relativi alla progettazione della SS 79 direttrice Terni-Rieti. Atti XXV Convegno Nazionale di Geotecnica, Milano-Stresa, 4-6 giugno 2014, volume 2, pagg. 193-202, Edizioni AGI, Roma. Ministero delle Infrastrutture e dei Trasporti; 2008: Le Norme Tecniche per le Costruzioni . ���� �� ������� ����� D.M. 14 gennaio 2008. GU 29 (Suppl. Ord. 30). Seed, H. B., Idriss, I. M.; 1971: Simplified procedure for evaluating soil liquefaction potential . J. Soil Mech. and Found. Div., ASCE, 97(9), 1249–1273. Seed H.B., Idriss I.M.; 1982: Ground motion and soil liquefaction during earthquakes . EERI Monograph, 134 pp. Youd, T. L., Idriss, I. M., Andrus, R. D., Arango, I., Castro, G., Christian, J. T., Dobry, R., Finn, W. D., Harder, Jr., L. F., Hynes, M. E., Ishihara, K., Koester, J. P., Liao, S. S. C., Marcuson, III, W. F., Martin, G. R., Mitchell, J. K., Moriwaki, Y., Power, M. S., Robertson, P. K., Seed, R. B., Stokoe, II, K. H.; 2001: Liquefaction Resistance of Soils: Summary Report . From the 1996 NCEER and 1998 NCEER/NSF Workshops on Evaluation of Liquefaction Resistance of Soils, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 127, No. 4, pp. 297-313. Detailed geophysical and geologic study in the Lampedusa Island: SIMIT Project G. Lombardo 1 , F. Panzera 1 , V.V. Salamanca 1 , S. Sicali 1 , N. Baldassini 1 , G. Barreca 1 , A. Di Stefano 1 , C. Monaco 1 , S. D’Amico 2 1 Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Italy 2 Physics Department, University of Malta, Msida, Malta Introduction. Recently, a joint Italo-Maltese research project (Costituzione di un Sistema Integrato di Protezione Civile Transfrontaliero Italo-Maltese, SIMIT) was financially supported by the European community with the aim to improve the geological and geophysical information in the area between the south-eastern Sicilian coast and the islands of Lampedusa and Malta with a final purpose to mitigate natural hazards. Although this region lies on a seismically active domain of central Mediterranean, the Sicily Channel Rift Zone, knowledge about seismotectonic and local seismic response are at present poorly studied. In order to improve these, we investigated the island of Lampedusa (Pelagian archipelago) by means a multidisciplinary approach concerning structural, morphologic and lithologic analyses. Results of geological-structural surveys were used to understand local seismic response of the distinct outcropping rocks and its influence on the existing buildings. Ambient noise recordings were used as seismic input, processing the data collected through spectral ratio techniques. Polarization of the horizontal component of motion was also investigated in order to set into evidence possible directional effects. Current findings contribute to fill up the information gap on the seismic features of this territory. Geology and tectonics of the study area. Lampedusa is an E-W elongated island located in the central Mediterranean sea, about 200 km south of the Sicilian coastline and 150 km east of Tunisia. The island consists of a 11 km long carbonate shelf that reaches the maximum topographic elevation of 133 m a.s.l. ���� ��� ���������� ����� �� ����� ��������� ������� From the structural point of view, Lampedusa belongs to the Pelagian block, a foreland domain at the northern edge of the African plate, formed by a 6–7 km thick Meso-Cenozoic shallow to deep-water carbonate successions (Civile et al. 2008, 2013). ��� ������ �� ������ ������ ��� ������ ���������� ��� �������� �������� �� � ����� The island is placed inside the Sicily Channel,at the southern shoulder of a Plio- Quaternary foreland rift zone that exhibits deep, NW-SE trending, fault-controlled structural depressions (e.g. the grabens of Pantelleria, Linosa and Malta). As revealed by available seismic database (INGV 1981-2013), the rift zone is characterized by a moderate seismicity, mostly located in the Linosa graben, with shallow events (h < 25 km) and magnitude usually from 2 to 4 (Civile et al. , 2008).