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Milli, Salvatore
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Milli, Salvatore
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- PublicationRestrictedI terreni di Roma sotto l'aspetto della geologia tecnica(2005-11)
; ; ; ; ; ; ; ; ; ; ; ; ;Cavarretta, G.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Cavinato, G. P.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Mancini, M.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Moscatelli, M.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Patera, A.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Raspa, G.; Università di Roma "La Sapienza" ;Stigliano, F. P.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Vallone, R.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Folle, D.; Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil ;Garbin, F.; Geoplanning S.r.l. ;Milli, S.; Università di Roma "La Sapienza" ;Storoni Ridolfi, S.; ANAS s.p.a; ; ; ; ; ; ; ; ; ; ; research project was carried out by the C.N.R. to develop an integrated geological-geotechnical model of the subsoil of Rome. Data of more than 6000 boreholes were archived in a GIS and used to develop the geological model; the results presented in this work mainly focused on the upper Pleistocene-Holocene alluvial deposits. Information of more than 2000 boreholes penetrating the alluvial deposits was encoded and elaborated using geostatistics to model the sedimentary bodies. Spatial variability of the physical and mechanical properties was also investigated to develop the geotechnical model. Multiple linear regression, kriging, and cokriging were applied to estimate the drained friction angle φ’; cross-validation demonstrates the cokriging with the PCA factors as auxiliary variables being the most suitable method. In progress work on cokriging of φ’ using granulometries as auxiliary variables demonstrates this approach to be viable for future applications.467 37 - PublicationRestrictedMantle-derived CO2 migration along active faults within an extensional basin margin (Fiumicino, Rome, Italy)(2014)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Fluid migration along faults can be highly complex and spatially variable, with the potential for channeled flow, accumulation in capped porous units, fault cross-flow, lateral migration along strike, or complete sealing. Extensional basin margins can be important for such migration, given the associated crustal thinning and decompression that takes place combined with potential geothermal or mantle gas sources. One such example is near the urban area of Rome, situated along the active extensional continental margin of the Tyrrhenian back arc basin and surrounded by Middle-Upper Pleistocene K-rich and arc-related volcanoes. Recent research activities in the area around Fiumicino, a town 25 km to the west of Rome, has highlighted the close spatial link between degassing CO2 and the faults that provide the necessary vertical migration pathways. In particular, detailed soil gas and gas flux surveys have highlighted the release at surface of large volumes of asthenospheric mantle CO2 in correspondence with normal faults observed in a new seismic reflection profile acquired along the Tiber River. Detailed reconstruction of the Pleistocene–Holocene stratigraphy of the area dates fault activity from 20,000 to 9000 years BP. It is proposed that the gas migrates preferentially along the cataclastic tectonic breccias of the faults until it encounters recent, unconsolidated sediments; porous units within this shallow stratigraphy act as temporary secondary traps for the leaking gas, with local gas release at the ground surface occurring where the sealing of the overlying aquitards has been compromised. Degassing and active faults confirm the extensional tectonics affecting the area and the geodynamic scenario of a mantle wedge beneath the western Apennines, associated with ongoing W-directed subduction. Moreover, degassing highlights the potential geochemical and seismic risks for the highly populated urban areas near Rome.114 1 - PublicationOpen AccessGeotechnical characterization of the upper Pleistocene-Holocene alluvial deposits of Roma (Italy) by means of multivariate geostatistics: Cross-validation results(2008)
; ; ; ; ; ; ; ; ; ; ; ;Raspa, G.; Università La Sapienza, Roma, Italy ;Moscatelli, M.; CNR-IGAG, Roma, Italy ;Stigliano, F.; CNR-IGAG, Roma, Italy ;Patera, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Marconi, F.; CNR-IGAG, Roma, Italy ;Folle, D.; Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil ;Vallone, R.; CNR-IGAG, Roma, Italy ;Mancini, M.; CNR-IGAG, Roma, Italy ;Cavinato, G. P.; CNR-IGAG, Roma, Italy ;Milli, S.; Università La Sapienza, Roma, Italy ;Coimbra Leite Costa, J. P.; Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; ; ; ; ; ; ; ; ; ; We are presenting an attempt to evaluate the spatial variability of geotechnical parameters in the upper Pleistocene–Holocene alluvial deposits of Roma (Italy) by means of multivariate geostatistics. The upper Pleistocene–Holocene alluvial deposits of Roma are sensitive to high levels of geohazard. They occupy a sizable and significant part of the city, being the foundation for many monuments, historical neighborhoods, and archaeological areas, and the main host of the present and future subway lines. We have stored information from more than 2000 geotechnical boreholes crossing the alluvial deposits into a relational database. For the present study, only the boreholes with lithologic/textural interpretation and geotechnical information were selected. The set includes 283 boreholes and 719 samples, which have a set of geotechnical information comprising physical properties and mechanical parameters. Techniques of multivariate statistics and geostatistics were combined and compared to evaluate the estimation methods of the mechanical parameters, with special reference to the drained friction angle from direct shear test (φ′). Principal Component Analysis was applied to the dataset to highlight the relationships between the geotechnical parameters. Through cross-validation analysis, multiple linear regression, kriging, and cokriging were tested as estimators of φ′. Cross-validation demonstrates that the cokriging with granulometries as auxiliary variables is the most suitable method to estimate φ′. In addition to proving that cokriging is a good estimator of φ′, cross-validation demonstrates that input data are coherent and this allows us to use them for estimation of geotechnical parameters, although they come from different laboratories and different vintages. Nevertheless, to get the same good results of cross-validation in estimation, it is necessary for granulometries to be available at grid points. Since this information being not available at all grid points, it is expected that, in the future, textural information can be derived in an indirect way, i.e., from lithologic/textural spatial reconstructions.723 4628 - PublicationOpen AccessGeothecnical modelling of the subsoil of Rome (Italy) by means of multivariate geostatistics(2006-09-03)
; ; ; ; ; ; ; ; ; ; ; ;Folle, D.; Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil ;Raspa, G.; Università di Roma "La Sapienza" ;Mancini, M.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Moscatelli, M.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Patera, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Stigliano, F. P.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Vallone, R.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Cavinato, G. P.; CNR, Istituto di Geologia Ambientale e Geoingegneria ;Milli, S.; Università di Roma "La Sapienza" ;Garbin, F.; Geoplanning S.r.l. ;Storoni Ridolfi, S.; ANAS S.p.a.; ; ; ; ; ; ; ; ; ; A research project was carried out by the C.N.R. to develop an integrated geological-geotechnical model of the subsoil of Rome. Data of more than 6000 boreholes were archived in a GIS and used to develop the geological model; the results presented in this work mainly focused on the upper Pleistocene-Holocene alluvial deposits. Information of more than 2000 boreholes penetrating the alluvial deposits was encoded and elaborated using geostatistics to model the sedimentary bodies. Spatial variability of the physical and mechanical properties was also investigated to develop the geotechnical model. Multiple linear regression, kriging, and cokriging were applied to estimate the drained friction angle φ’; cross-validation demonstrates the cokriging with the PCA factors as auxiliary variables being the most suitable method. In progress work on cokriging of φ’ using granulometries as auxiliary variables demonstrates this approach to be viable for future applications.223 257 - PublicationOpen AccessGeological hazard assessment of the coastal area of Rome (Central Italy) from multi-source data integration(2022-01-13)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; This work presents the first 3D geological model of the Rome coastal area that integrates available subsurface geological, stratigraphic and geophysical data with surface geochemical data obtained both from the literature and new surveys. The model provides new insights into the stratigraphic and tectonic setting of the area and the geological factors controlling both natural and human-induced gas emissions. This sector of the Italian Tyrrhenian margin has been historically affected by natural emissions of deep CO2 and thermogenic CH4, stored in permeable layers but with local migration to the surface along buried normal faults. In addition to natural processes, human activities can also cause leakage and serious health risks, such as the abrupt gas release in August 2013, that was triggered by borehole drillings near the Rome international airport. The presented 3D reconstruction unveils the link between faults, stratigraphy, lithology and the distribution of the soil gas anomalies. It provides information about the depth of the reservoir that can potentially trap endogenous gases, and the location and geometry of the main faults along which the gas migrates towards the surface. Furthermore, reconstruction of the distribution and thickness of important clay layers better constrains the low permeable areas that prevent gas escape. The 3D model, coupled with the geochemical information, can serve as a useful tool for the local administration to perform land-use planning and manage the local geological and degassing hazards that affect this highly urbanized area near Rome. Furthermore, we estimate that the large amount of CO2 broadly released in the area also provides a contribution to the budget of natural greenhouse gases in the atmosphere.311 32