GNGTS 2013 - Atti del 32° Convegno Nazionale

de Franco R.; 2005. Multi-refractor imaging with stacked refraction convolution section . Geophys. Prosp. 53 (3), 335-348. de Franco R.; 2011. Refractor velocity analysis: a signal processing procedure . Geophysical Prospecting 59, 432-454. Gruppo di Lavoro MS; 2008. Indirizzi e criteri per la microzonazione sismica . Conferenza delle Regioni e delle Province Autonome – Dipartimento della Protezione Civile, Roma, 3 vol. e CD-ROM. ISIDe Working Group – INGV; 2010. Italian Seismological Instrumental and parametric database : http://iside.rm.ingv.it Norme Tecniche per le Costruzioni – NTC; 2008. DM 14 gennaio 2008, Gazzetta Ufficiale, n. 29 del 4 febbraio 2008, Supplemento Ordinario n. 30, Istituto Poligrafico e Zecca dello Stato, Roma (www.cslp.it ). Priolo E. (Resp. Scient.) e Gruppi di Lavoro OGS-CRS (Priolo E., Romanelli M., Laurenzano G., Barnaba C.) e CNR- IDPA (de Franco R., Caielli G., Corsi A., Morrone A., Tento A., Boniolo G., Ragazzo P.); 2013. Convenzione per l’esecuzione di studi geofisici finalizzati alla microzonazione dell’area urbana di Umbertide . Relazione finale delle attività. Relazione OGS n. 2013/56 Sez. CRS 19, Sgonico, 30 maggio 2013 Pergalani F e Compagnoni M.; 2013. Esecuzione di modellazioni mono e bidimensionali finalizzate alla microzonazione sismica dell’area urbana di Umbertide. 1° parte: input sismico – Versione 2. Convenzione tra Regione Umbria Giunta Regionale – Servizi Tecnici Regionali e Politecnico di Milano, Dipartimento di Ingegneria Strutturale. On the performances of site parameters for soil classification R. Puglia 1 , D. Albarello 2 , L. Luzi 1 , D. Bindi 3 , R. Gallipoli 4 , M. Mucciarelli 5 , G. Naso 6 , F. Pacor 1 , E. Peronace 6 1 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano-Pavia, Italy 2 Department of Earth Sciences, University of Siena, Italy 3 Deutsches Geo Forschungs Zentrum GFZ, Centre for Disaster Managment CEDIM, Potsdam, Germany 4 Istituto Metodologie Analisi Ambientali CNR, Potenza, Italy 5 Department of Structures, Geotechnics and Engineering Geology, University of Basilicata, Potenza, Italy 6 Dipartimento della Protezione Civile, Rome, Italy Significant increase in damage has been directly ascribed to the effects of local site conditions during recent earthquakes, such as 1985 Mexico City, 1989 Loma Prieta, 1994 Northridge, 1995 Kobe, 1999 Chi-Chi, among others. The selection of specific elastic response spectra according to soil categories is the easiest way to account for site effects in engineering projects and general-purpose hazard maps. Ground motion prediction equations often consider a soil categorization, in order to quantify the variation of ground motion due to the presence of soil layers of different depths and nature. The selection of specific elastic response spectra according to soil categories is the standard to account for site effects in engineering design and general-purpose hazard maps. Most of the international seismic codes are based on the average shear wave velocity of the upper 30 m (V S30 ) to discriminate between soil categories. The works of Borcherdt and Glassmoyer (1992) and Borcherdt (1994) were the first to propose the adoption of the Vs,30 parameter (average shear wave velocity of the upper 30 m) as a tool to discriminate soils with similar seismic response. Many seismic codes are based on this parameter, such as the 1997 NEHRP Provisions and 1997 Uniform Building Code (BSSC 1998) or the Eurocode 8 (ENV 1998, Eurocode 8: Design of structures for earthquake resistance, hereinafter referred to EC8, see Table 1). In Italy, the Italian code Norme tecniche per le costruzioni (NTC 2008; Chap. 3 Azioni sulle costruzioni, Par. 3.2 Azione sismica) proposes the same soil categories as identified in the EC8 code. Nevertheless, after Borcherdt (1994), some doubts arose about the capability of V S30 in site effects estimation (among others, Steidl, 2000; Park and Hashash, 2004; Stewart et al. , 2003; Castellaro et al. , 2008; Lee and Trifunac, 2010). Borcherdt (1994) had some doubts about the capability of V s,30 to predict amplification outside the region where the method was developed (southern California). Steidl (2000) found a poor correlation between site class and site amplification and suggested that a depth-to-basement parameter might be more useful to predict ground motion amplification. Park and Hashash (2004) studied the problem in deep basins, with the example of the Mississippi embayment, finding that NEHRP provisions may not be appropriate for 312 GNGTS 2013 S essione 2.2