18 research outputs found
ask 6 - Gubbio - Deliverable D21: Geological model of the Gubbio basin (Italy) for the characterization of local seismic response
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.Progetto INGV-DPC S3 “Scenari di scuotimento in aree di interesse prioritario e/o strategico” (coord. F.Pacor e M. Mucciarelli)Published4.1. Metodologie sismologiche per l'ingegneria sismicaope
ask 6 - Gubbio - Deliverable D21: Geological model of the Gubbio basin (Italy) for the characterization of local seismic response
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
Microseismicity within a karstified rock mass due to cracks and collapses as a tool for risk management
20MO CONGRESSO NAZIONALE DELLA SOCIETÀ ITALIANA DI CRIMINOLOGIA, (GARGNANO 19-21 OTTOBRE 2006.) b) “Evoluzione della Criminalità in Sud America e in Italia in un ventennio di Ricerche (1985 – 2005). Profili comparatistici” Rivellino G.S.; Mastronardi V.
21MO CONGRESSO NAZIONALE DI CRIMINOLOGIA ( GARGNANO 18-20 OTTOBRE 2007) b) “Andamento della Criminalita’ in Sud-America e in Italia in relazione al tasso di poverta’ (1985-2005) (Aggiornamenti)” Rivellino G.S.; Mastronardi V.
MADRI FIGLICIDE :PSICOBIOGRAFIA E PANORAMICA SULLA RICERCA EFFETTUATA PRESSO L'OPG DI CASTIGLIONE DELLE STIVIERE SU 11 CASI DAL 2004 AL 2007
Satellite A-DinSAR monitoring of the Vittoriano monument (Rome, Italy). Implications for heritage preservation
The "Vittoriano" monument, dedicated to king Vittorio Emanuele II, is one of the most famous cultural heritage landmarks in Rome (Italy), even because it hosts the Tomb of the unknown soldier, monument to the Italian fallen in wars. It was designed by the architect Giuseppe Sacconi at the end of 19th century and since the beginning of its construction, it has been affected by cracks and deformations. In the last years, such phenomena have become more evident, especially on the western side of the building. With the aim of understanding the causes of the deformation process and making a diagnosis of the soil-structure interaction of the Monument, a specific project has been undertaken between CERI Sapienza and the Lazio Museum Network.Satellite ADInSAR was performed to infer the recent deformational history of the main parts of the monument, by using medium and high-resolution SAR images acquired in double orbital geometry (ascending and descending) and covering the last two decades.Through the support of selected geological and lithotechnical data it was possible to interpret the deformational dynamics of the Vittoriano.The overall investigations allowed to better define the volume and the structures that have been involved in the deformation mechanisms, which is currently driving the overall process, in order to address effective mitigation measures. They are capable of backward analysing the deformational process, reconstructing the evolution of a phenomenon and above all capable of easily investigating large areas
Italian accelerometric archive: geological, geophysical and geotechnical investigations at strong-motion stations
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