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Chiauzzi, L.
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Chiauzzi, L.
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- PublicationRestrictedMicrozonation of Potenza (Southern Italy) in terms of spectral intensity ratio using joint analysis of earthquakes and ambient noise.(2012)
; ; ; ; ; ; ; ;Strollo, A.; Helmholtz Centre Potsdam, GFZ ;Parolai, S.; Helmholtz Centre Potsdam, GFZ ;Bindi, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Chiauzzi, L.; DiSGG University of Basilicata ;Pagliuca, R.; DiSGG University of Basilicata ;Mucciarelli, M.; DiSGG University of Basilicata ;Zschau, J.; Helmholtz Centre Potsdam, GFZ; ; ; ; ; ; A temporary seismic network composed of 11 stations was installed in the city of Potenza (Southern Italy) to record local and regional seismicity within the context of a national project funded by the Italian Department of Civil Protection (DPC). Some stations were moved after a certain time in order to increase the number of measurement points, leading to a total of 14 sites within the city by the end of the experiment. Recordings from 26 local earthquakes (Ml 2.2−3.8 ) were analyzed to compute the site responses at the 14 sites by applying both reference and non-reference site techniques. Furthermore, the Spectral Intensity (SI) for each local earthquake, as well as their ratios with respect to the values obtained at a reference site, were also calculated. In addition, a field survey of 233 single station noise measurements within the city was carried out to increase the information available at localities different from the 14 monitoring sites. By using the results of the correlation analysis between the horizontal-to-vertical spectral ratios computed from noise recordings (NHV) at the 14 selected sites and those derived by the single station noise measurements within the town as a proxy, the spectral intensity correction factors for site amplification obtained from earthquake analysis were extended to the entire city area. This procedure allowed us to provide a microzonation map of the urban area that can be directly used when calculating risk scenarios for civil defence purposes. The amplification factors estimated following this approach show values increasing along the main valley toward east where the detrital and alluvial complexes reach their maximum thickness.285 23 - PublicationRestrictedBuilding damage scenarios based on exploitation of Housner intensity derived from finite faults ground motion simulations(2012)
; ; ; ; ; ; ; ; ;Chiauzzi, L.; Department of Structures, Geotechnics and Engineering Geology, University of Basilicata, Potenza, Italy ;Masi, A.; Department of Structures, Geotechnics and Engineering Geology, University of Basilicata, Potenza, Italy ;Mucciarelli, M.; Department of Structures, Geotechnics and Engineering Geology, University of Basilicata, Potenza, Italy ;Vona, M.; Department of Structures, Geotechnics and Engineering Geology, University of Basilicata, Potenza, Italy ;Pacor, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Cultrera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Gallovic, F.; Department of Geophysics, Charles University, Prague, Czech Republic ;Emolo, A.; Dipartimento di Scienze Fisiche, Università “Federico II”, Naples, Italy; ; ; ; ; ; ; In this paper earthquake damage scenarios for residential buildings (about 4200 units) in Potenza (Southern Italy) have been estimated adopting a novel probabilistic approach that involves complex source models, site effects, building vulnerability assessment and damage estimation through Damage Probability Matrices. Several causative faults of single seismic events, with magnitude up to 7, are known to be close to the town. A seismic hazard approach based on finite faults ground motion simulation techniques has been used to identify the sources producing the maximum expected ground motion at Potenza and to generate a set of ground motion time histories to be adopted for building damage scenarios. Additionally, site effects, evaluated in a previouswork through amplification factors of Housner intensity, have been combined with the bedrock values provided by hazard assessment. Furthermore, a new relationship between Housner and EMS-98 macroseismic intensity has been developed. This relationship has been used to convert the probability mass functions of Housner intensity obtained from synthetic seismograms amplified by the site effects coefficients into probability mass function of EMS-98 intensity. Finally, the Damage Probability Matrices have been applied to estimate the damage levels of the residential buildings located in the urban area of Potenza. The proposed methodology returns the full probabilistic distribution of expected damage, thus avoiding average damage index or uncertainties expressed in term of dispersion indexes.254 23