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Onida, M.
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Onida, M.
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- PublicationOpen AccessA comparison of seismic risk maps for Italy(2009-02)
; ; ; ; ; ; ; ; ;Crowley, H.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Colombi, M.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Borzi, B.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Faravelli, M.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Onida, M.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Lopez, M.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Polli, D.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Meroni, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; ; ; ; ; ; ; National seismic risk maps are an important risk mitigation tool as they can be used for the prioritization of regions within a country where retrofitting of the building stock or other risk mitigation measures should take place. The production of a seismic risk map involves the convolution of seismic hazard data, vulnerability predictions for the building stock and exposure data. The seismic risk maps produced in Italy over the past 10 years are compared in this paper with recent proposals for seismic risk maps based on state-of-the-art seismic hazard data and mechanics-based vulnerability assessment procedures. The aim of the paper is to open the discussion for the way in which future seismic risk maps could be produced, making use of the most up-to-date information in the fields of seismic hazard evaluation and vulnerability assessment.303 4145 - PublicationOpen AccessMICROZONATION STUDY FOR AN INDUSTRIAL SITE IN SOUTHERN ITALY(2008-10-12)
; ; ; ; ; ; ; ; ; ;Fiorini, E.; European Centre for Training and Research in Earthquake Engineering, Pavia , Italy ;Onida, M.; European Centre for Training and Research in Earthquake Engineering, Pavia , Italy ;Borzi, B.; European Centre for Training and Research in Earthquake Engineering, Pavia , Italy ;Pacor, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Luzi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Meletti, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;D'Amico, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Marzorati, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Ameri, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; ; ; ; ; ; ; ; ; ; ;Fiorini, E.; European Centre for Training and Research in Earthquake Engineering, Pavia. ItalyA microzonation study for an industrial area located in Sicily (southern Italy) has been carried out through anintegrated approach using GIS and modelling tools for subsurface geology, together with procedures for soilresponse estimation. The seismic input was provided by an updated seismic hazard analysis aimed at betterdefining and characterizing the seismogenic sources active in the region. The approach involved thedevelopment of a model of the subsurface geology through the interpretation of several borehole data comingfrom industrial or private wells records. The lithologies described in the borehole logs were reclassified according to main litotechnical units for which seismological properties were available from previous studies.The reclassified logs were then interpreted using the GSI3D software (Geological Surveying and Investigation in3 Dimensions), which allows to draw and cross-correlate geological sections over the whole study area, toproduce 3D surfaces which model the topography of each litotechnical unit at depth. The model was thenimported into a GIS and linked to a customised version of SHAKE91 for the estimation of 1D soil response at a grid of points. Maps of amplification factors for different periods of engineering interest have been produced.The methodology used in this work has produced a dynamic tool which allows an easy update of themicrozonation maps as new data become available, since both the subsurface model and the litotechnical unitsparameters can be quickly updated and new analyses run.194 683 - PublicationRestrictedDeriving vulnerability curves using Italian earthquake damage data(2008-08)
; ; ; ; ; ; ;Colombi, M.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Borzi, B.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Crowley, H.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Onida, M.; EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, Pavia, Italy ;Meroni, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Pinho, R.; Dipartimento di Meccanica Strutturale, Università degli Studi di Pavia, Via Ferrata 1, Pavia, Italy; ; ; ; ; The concerted effort to collect earthquake damage data in Italy over the past 30 years has led to the development of an extensive database from which vulnerability predictions for the Italian building stock can be derived. A methodology to derive empirical vulnerability curves with the aforementioned data is presented herein and the resulting curves have been directly compared with mechanics-based vulnerability curves. However, it has been found that a valid comparison between the empirical and analytical vulnerability curves is not possible mainly due to a number of shortcomings in the database of surveyed buildings. A detailed discussion of the difficulties in deriving vulnerability curves from the current observed damage database is thus also presented.292 37