GNGTS 2015 - Atti del 34° Convegno Nazionale

ISPRA; 2009 : Carta Geologica d’Italia alla scala 1:50.000, Foglio 203 Poggio Renatico. Coord. Scient.: U. Cibin, Regione Emilia-Romagna. ISPRA, Servizio Geologico d’Italia. Regione Emilia-Romagna, SGSS. Kramer S. L.; 1996 : Geotechnical earthquake engineering , Upper Saddle River, N.J.: Prentice Hall. Matasovic N.; 1992 : Seismic response of composite horizontally-layered soil deposits . Ph.D. Thesis, University of California, Los Angeles. Matasovic N., Vucetic M.; 1995 : Generalized Cyclic Degradation-Pore Pressure Generation Model for Clays . ASCE Journal of Geotechnical and Geoenvironmental Engineering, Vol. 121, No.1, pp 33-42. Park D., Hashash Y. M. A.; 2004 : Soil damping formulation in nonlinear time domain site response analysis . Journal of Earthquake Engineering, Vol. 8, No. 2, pp 249-274. RER, ENI –Agip ; 1998 : Riserve idriche sotterranee della Regione Emilia Romagna . A cura di G.M. Di Dio. Regione Emilia - Romagna - ENI, divisione Agip. S.EL.CA. , Firenze, pp 120. Soil amplification in Santiago de Cuba Z.C. Rivera 1 , D. Slejko 2 , L.F. Caballero 1 , J.L. Alvarez 1 , M. Santulin 3 1 National Centre of Seismological Researches, Santiago de Cuba, Cuba 2 Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Sgonico (TS), Italy 3 Istituto Nazionale di Geofisica e di Vulcanologia, Milan, Italy Introduction. The Cuban territory is placed on the border between the Gonave Microplate and the North American Plate. The city of Santiago de Cuba is located in the south-eastern part of Cuba island, very close to the Oriente Fault Zone, which is the main tectonic feature of the plate boundary in the eastern part of Cuba. South-eastern Cuba is the most tectonically active region throughout the country and the largest earthquakes occurred there. In fact, 22 of the 28 major catastrophic events in the history of the island were located in this part of Cuba (Chuy, 1999). The earthquakes causing of the most damaging effects in the area of Santiago de Cuba occurred in 1766 and 1852, with Imax = IX MSK, and 1932, with Imax = VIII MSK [where MSK is the Sponheuer-Medvedev-Karnik macroseismic intensity scale (Medvedev et al ., 1964)]. The municipality of Santiago de Cuba, with a population of nearly half a million inhabitants (492,891), is the second most populated city and one of the oldest of the island. The city is located in a sedimentary basin around the Santiago de Cuba Bay, which is connected southwards to the Caribbean Sea. The reliefs around the basin are semi-mountainous with several marine terraces and the coastal plains and plateaux are found in the proximities of the coast. The basin of Santiago de Cuba is a depression caused by the subsidence of the area. For commercial reasons and from the constructive point of view, the settlements developed around the bay, where recent sediments of Neogene-Quaternary age outcrop. These soft sediments cause that the effects of the earthquakes are more intense causing panic among residents and structural damage to buildings in some cases. The constant population growth and the frequent seismic activity in the region have motivated the development of various research projects aimed at reducing the seismic risk. Currently, the National Seismological Research Center, in collaboration with the National Institute of Oceanography and Experimental Geophysics, is developing a project with the goal of improving the seismic hazard estimates of the Cuban national territory, considering the detailed characteristics of the soil: Santiago de Cuba has been taken as a study case. The aim of this work is the elaboration of the soil amplification map for Santiago de Cuba, from the definition of a 3D geotechnical model of the terrain and 1D and 2D modelling of the local response of soils. The information given by the map of the amplification factors (AFs) for Santiago de Cuba is fundamental in urban planning and designing and can be used also in investigations and actions aimed at seismic risk reduction. 170 GNGTS 2015 S essione 2.2