GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 2.2 359 named the “shadow cone”. In order to do a quantitative analysis of the rock fall hazard the preceding information were subsequently integrated with numerical models by using the commercial code ROTOMAP (Geoandsoft int., 2012). This part of the study is still on going. Nonetheless, in order to combine the two main hazards that took place at Casentino urban area, the present authors are developing LS hazard analyses by ROTOMAP considering the amplified seismic signals drawn from FEM analyses of the MuroMurato rocky wall as additional load in Eq. 1. In this equation the dynamic acceleration contributes to the velocity of the detachment of the rocky blocks. The results of this study will enable the authors to draw combined hazard maps of LS and RSL effects at Casentino site. Conclusions. This study is devoted to deal with multi-hazard scenarios that took place at Casentino urban center. Here, the seismic event of 2009 L’Aquila earthquake triggered local amplification effects and rock boulder rollings and falling within the urban territory of a small area (about 86.51 km 2 ). Thus, in order to quantify the twofold hazard scenarios, at first two separate studies of rock slope instability and local amplification simulations have been carried out. Then, a non linear combination of the two hazards has been proposed by calculating the run-out of the rocky boulders due to both static and seismic horizontal loadings. The seismic loading should be calculated after a FEM study of the rocky wall model although the peak ground acceleration suggested by the Italian technical code (NTC08) can be preliminarily taken into account. References Esri Italia; 2010: ArcGIS for desktop (www.esritalia.it) . ICMS; 2010: Indirizzi e criteri per la microzonazione sismica. Dipartimento della protezione civile e conferenze delle regioni e delle province autonome. Dipartimento della Protezione Civile Editore. Topcorn; 2012: ImageMaster (https://www.topconpositioning.com/software/mass-data-collection/imagemaster ). Liu Z., Nadim F., Garcia A. A., Mignan A., K. Fleming, Luna B.Q.; 2015: A three-level framework for multi-risk assessment , Georisk, http://dx.doi.org/10.1080/17499518.2015.1041989. NTC08; 2008: Norme Tecniche per le Costruzioni . D.M. 14 Gennaio 2008 (G.U. n. 29 del 04/02/2008 suppl. ord. n.30) Pace B., Albarello D., Boncio P., Dolce M., Galli P., Messina P., Peruzza L., Sabetta F., Sanò T., Visini F.; 2011: Predicted ground motion after the L’Aquila 2009 earthquake (Italy, Mw 6.3): input spectra for seismic microzoning . Bull Earth Engnr, DOI 10.1007/s10518-010-9238-y. Geoandsoft int.; 2012: ROTOMAP (http://www.geoandsoft.com) . Stacec Srl; 2015: LSR 2D - Risposta Sismica Locale (http://www.stacec.it/Prodotto/92/lsr-2d ). INTEGRATED GEOLOGICAL AND GEOPHYSICAL INVESTIGATIONS TO CHARACTERIZE SITE EFFECTS IN FAULTED ROCK MASS: THE CASE HISTORY OF GUARCINO (CENTRAL ITALY) S. Giallini 1,2 , F. Polpetta 1 , G. Vignaroli 1 , M. Moscatelli 1 1 Consiglio Nazionale delle Ricerche, Istituto di Geologia Ambientale e Geoingegneria CNR - IGAG, Roma, Italy 2 Dipartimento di Ingegneria e Geologia INGEO, Università degli Studi “G. d’Annunzio”, Chieti Pescara, Italy Introduction and the study area. This work, by examining a pervasively faulted carbonate substratum, investigates the role of brittle tectonic structures on site effects. Amultidisciplinary dataset has been integrated in order to describe the internal fault architecture in terms of geomechanical properties and seismic wave polarisation and amplification conditions of the rock mass. Seismic waves generated at earthquake sources may be affected by amplitude-frequency- duration modifications during propagation throughout geological layers. About this topic, studying site effects at rock sites characterised by wide spread faulting/fracturing characteristics requires a quantitative evaluation of the seismic response (Rovelli et al. , 2002; Martino et al. ,