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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 - PublicationOpen Accessask 6 - Gubbio - Deliverable D21: Geological model of the Gubbio basin (Italy) for the characterization of local seismic response(2007-07)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Fiorini, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Pacor, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Bindi, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Rovelli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Cara, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;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 ;Monachesi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Nieto, D.; INOGS Trieste ;Bohm, G.; INOGS Trieste ;Albarello, D.; univerita' Siena ;D'Amico, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Picozzi, M.; univerita' Siena ;Mucciarelli M.; universita' Basilicata ;Scarascia Mugnozza, G.; universita' La Sapienza Roma ;Rivellino, S.; universita' La Sapienza Roma ;Menichetti, M.; universita' Urbino ;Parolai, S.; GFZ Postdam ;Richwalsky, S.; GFZ Postdam ;Orpsal, I; GFZ Postdam; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Within the framework of the project S3 “Ground shaking scenarios for some strategic areas in Italy-Task6” the town of Gubbio has been selected as a test site to compute ground motion taking into account finite fault and site effects. Gubbio is located in central Italy, on the northern slopes of one of the many valleys characterising the central Appennines. The historical settlement is located on a rocky slope, while new developments extend on the Quaternary fluvio-lacustrine deposits filling the basin. The Gubbio basin was chosen as a test site for a number of reasons: its geomorphological setting is very common in central and southern Italy, the area is characterised by frequent near events of moderate magnitude (Mmax 6) and large amplifications were observed there for the Colfiorito seismic sequence of the 1997/98. In order to understand the mechanisms controlling the 3D seismic response of the basin, a subsurface model has been constructed. The reconstruction of the model has been done using data coming from different surveys (figure A). Several active and passive seismic measurements have been carried out in the plain, also favoured by the intense seismic activity typical of the area. These investigations mainly consisted of monitoring activities of 4 temporary transects of seismometric stations, operating between June 2005 and May 2006 and described in detail in PS3- Deliverables D22-D23. Two transects have been positioned perpendicularly to the valley axes (GFZ and Ge2 Transects), one parallel (INGV transect) and one near Gubbio (Ge1 transect). More than 300 local and regional earthquakes have been recorded, with maximum magnitude equal to 4. A 2D array was run as well from June to September 2006, to better understand the generation of surface waves. All data are collected in a GIS (Progetto S3 Deliverable D23) Parallel to these activities, ambient noise data have been collected in the field for 90 sites, using the single station technique for the estimation of the fundamental resonance frequencies. Furthermore, 4 noise measurements with a seismic array have been collected to build an S-wave velocity profile of soft sediments, considered representative for the whole plain. The geometry of the basin below 500 m of depth has been investigated through the acquisition of an active seismic line 4.5 km long, in correspondence of one of the transects. This has been used to perform a tomography of arrival times which allowed to recognise the position and shape of the reflecting horizons. As a final step the first 30 metres of deposits have been characterised over a 30 km2 area, using both stratigraphic investigations provided by the Gubbio Municipality and data collected from in-situ surveys and lab tests. In this deliverable we describe the input data for the 3D model of the Gubbio basin and we outline the steps performed to define the geometry, the layers and their seismic properties on the base of the experimental data collected during the project and of the available geological information.295 583 - 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 - PublicationOpen AccessThe Italian strong motion data base: design, data input and web distribution(2009)
; ; ; ; ; ; ; ; ; ;Luzi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Sabetta, F.; DPC ;Mele, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Heilemikael, S.; UNIROMA1 ;Bindi, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Pacor, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Massa, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Lovati, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Gorini, A.; DPC; ; ; ; ; ; ; ; A new Italian strong-motion data base was created during a joint project between Istituto Nazionale di Geofisica e Vulcanologia (INGV, Italian Institute for Geophysics and Vulcanology) and Dipartimento della Protezione Civile (DPC, Italian civil protection). The aim of the project was the collection, homogenization and distribution of strong motion data acquired in the time span 1972-2004 in Italy by different institutions, namely Ente Nazionale per l’Energia Elettrica (ENEL, Italian electricity company), Ente per le Nuove tecnologie, l’Energia e l’Ambiente (ENEA, Italian energy and environment organization) and DPC with different purposes, such as permanent strong motion monitoring and temporary monitoring during seismic sequences or before permanent installation. The data base contains 2182 three component waveforms generated by 1004 earthquakes with a maximum moment magnitude of 6.9 (1980 Irpinia earthquake) and can be accessed on-line at the site http://itaca.mi.ingv.it, where a wide range of search tools enables the user to interactively retrieve events, recording stations and waveforms with particular characteristics, whose parameters can be specified, as needed, through user friendly interfaces. A range of display options allows users to view data in different contexts, extract and download time series and spectral data. This article describes the data base structure and the working steps which led to the completion of the project.212 145 - 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