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Di Filippo, Gerarda
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- PublicationOpen AccessItalian accelerometric archive: geological, geophysical and geotechnical investigations at strong-motion stations(2010)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Luzi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Lovati, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;D'Alema, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Marzorati, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Di Giacomo, D.; GFZ Potsdam ;Hailemikael, S.; UNIROMA1 ;Cardarelli, E.; UNIROMA1 ;Cercato, M.; UNIROMA1 ;Di Filippo, G.; UNIROMA1 ;Milana, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Di Giulio, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Rainone, M.; UNICH ;Torrese, P.; UNICH ;Signanini, P.; UNICH ;Scarascia Mugnozza, G.; UNIROMA1 ;Rivellino, S.; UNIROMA1 ;Gorini, A.; DPC; ; ; ; ; ;; ; ; ; ; ; ; ; ; ; Geological, geophysical and geotechnical investigations, for the characterization of the strong-motion recording sitesmanaged by the ItalianCivil Protection, have been carried out in the framework of the project “Italian strong-motion database in the period 1972–2004”. The project aimed at creating an updated database of strong-motion data acquired in Italy by different institutions in the time span 1972–2004, and at improving the quality of disseminated data. This article illustrates the state of the recording site characterization before the beginning of the project, explains the criteria adopted to select the sites where geophysical/ geotechnical investigation have been performed and describes the results of the promoted field surveys.255 3437 - PublicationRestrictedGeophysical investigations for seismic zonation in municipal areas with complex geology: The case study of Celano, Italy(2008)
; ; ; ; ; ;Cardarelli, E.; Sapienza, Università di Roma, D.I.T.S. ;Cercato, M.; Sapienza, Università di Roma, D.I.T.S. ;De Nardis, R.; Dipartimento della Protezione Civile ;Di Filippo, G.; Sapienza, Università di Roma, D.I.T.S. ;Milana, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; ; ; ; A quantitative prediction of seismic site effects requires the definition of a subsoil parametric model for ground motion numerical modelling. This paper describes an application of integrated geophysical methods to define an earthquake engineering parametric model for the seismic zonation of the municipal area of Celano, Italy. In municipal areas of such extent, particularly in case of complex geology, subsurface characterization is an optimization procedure, where the objective function to be minimized is the uncertainty related to the subsoil features, under the constraint of fixed resources and logistical limitations. In the particular case of Celano, correlation between different geophysical results was very profitable in discriminating different geological scenarios in the historical centre and in areas designed for urban expansion, while defining the elastic properties of the near-surface deposits throughout the municipal area.200 49 - PublicationRestrictedShear-wave velocity profiling at sites with high stiffness(2010-02)
; ; ; ; ; ; ;Cercato, M.; DITS, University La Sapienza of Rome, Italy ;Cara, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Cardarelli, E.; DITS, University La Sapienza of Rome, Italy ;Di Filippo, G.; DITS, University La Sapienza of Rome, Italy ;Di Giulio, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Milana, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; ; ; ; ; Three sites of the Italian Strong Motion Network (RAN) have been selected for detailed S-wave profiling, using both borehole and surface wave seismic methods. At these sites, the presence of stiffness contrasts within the soil column is found to influence the surface wave propagation profoundly. Advanced aspects in surface wave inversion such as resolution, accuracy and higher-mode interpretation must be properly taken into account to obtain realistic results from the surface wave dispersion observations. The possibility of mode misidentification and the loss of resolution with depth in surface wave interpretation are explored using synthetic modelling together with active and passive seismic data sets. With high stiffness contrasts, the possibility of mode jumps and higher mode dominance over specific frequency ranges is very probable. This is true also for normally dispersive sites, where the shear velocity increases with depth, though higher mode dominance is recognized as more common in the case of a shear-wave velocity inversion within the soil column and the sensitivity of the dispersion curves with respect to those layers beneath the low-velocity zone may be significantly reduced. Pitfalls in the inversion resulting from mode misidentification can be avoided by investigating the effective phase velocity distribution, using active data sets and full waveform seismic modelling. When an unambiguous modal identification is achieved, the results obtained by surface wave inversion are very satisfactorily consistent with borehole data.168 43