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Orlando, Luciana
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Orlando, Luciana
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- PublicationOpen Access2D gravity modelling along the CROP11 seismic profile(2006-09)
; ; ;Tiberti, M. M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Orlando, L.; Dipartimento di Idraulica Trasporti e Strade - Area Geofisica - Università degli Studi di Roma "La Sapienza"; The purpose of this work is to present a gravity reconstruction of the deepest portion of the CROP 11 seismic line. The 2D gravity modelling is constrained by DSS data and by deep reflection seismic data obtained along the CROP 11 line. The role of the regional gravity anomaly trend of Central Italy as an independent constraint for the geological interpretation of the seismic line is also highlighted. The main gravity low (Fucino Plain) in the area is compensated by the combined effect of a regional deepening of both the Moho and the top of the crystalline basement, while the gravity low, located east towards the Maiella Mt., seems to originate between a 4 and 10 km depth. A lower density can be assigned to the western portion of the mantle with respect to the eastern side. The westernmost part of the upper crust in the model also shows a slightly lower density. The crystalline basement is not likely to be heavily involved in the deformation of the chain; ramp-and-flat deformations are present down to a depth of 20 km, i.e. the “highly reflective body” on the western side of the profile, which does not have a marked gravity imprint and should be due to relatively “light” sedimentary units.252 270 - PublicationOpen AccessPreface Special issue: Monitoring and Seismic Characterization of Archaeological Sites and StructuresThe preservation of cultural heritage is a crucial issue in areas prone to seismic and other natural hazards. The major challenge in pursuing such an important objective is related to the extreme fragility of ancient monuments and buildings exposed for centuries to the ravages of time. A suitable way to successfully proceed in the preservation effort of monumental structures should be based on then integrated use of different non-invasive diagnostic techniques, aimed at understanding the geological and geotechnical features of the areas where monuments are founded and the structural characteristic of the construction itself. In this perspective a team composed by researchers of ENEA, INGV and Sapienza University of Rome has recently carried out geophysical and structural investigations on the Amphiteatrum Flavium in Rome, better known as Colosseum, which is the symbol of monumental heritage in Italy and well-known all over the world. The experimental campaign was only a preliminary analysis of the very famous archaeological site that allowed outlining the state of knowledge about the characteristics of the site and the structure and should be considered as a starting point for an in-depth investigation of the monument vulnerability. In our opinion, the benefits of such an integrated approach can steer the political and social choices related with the preservation of the cultural heritage at National or European level. The results obtained were very interesting and induced the authors to propose their publication in a special issue of an international journal. The scope of this choice was twofold: ensuring both a wide audience with these activities and a serious review process of the studies. Therefore, we selected the most interesting results of the experimental campaign and invited a number of researchers involved in the field of “Monitoring and Seismic Characterization of Archaeological Sites and Structures” to contribute to this special issue. The relevance of this volume has been emphasized by the occurrence of the recent seismic sequence in Central Italy, whose mainshocks of August 24th and October 26th and 30th, 2016, caused 298 victims, hundreds of injured and the damage to most of the cultural heritage in the area. Symbol of the open wound left by the seismic sequence on the monumental patrimony is the San Benedetto Cathedral in Norcia. The morning of October 30th only the façade of the church, which is dedicated to the Patron Saint of Europe and represents the emblem of the medieval architecture in Central Italy dating back to XIII century, was still standing. It is worth noting that the mainshocks were clearly felt in Rome, at distance of about 100 km.
104 126 - PublicationOpen AccessGravity modelling along CROP04 seismic profile(2007)
; ; ;Tiberti, M. M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Orlando, L.; Dipartimento Idraulica, Trasporti e Strade, Area Geofisica, Università degli Studi di Roma “La Sapienza”, Via Eudossiana n°18, 00184 Roma; The processing and interpretation of seismic lines, together with the analysis of surficial geological data and hydrocarbon wells data, are powerful tools for the investigation of crust structures. Nevertheless, for depths exceeding that portion of crust usually investigated for commercial purposes, only geophysical data are generally available (among the others: NVR seismic from CROP project, DSS data, magnetic data, gravity data). In this context, the possibility of comparing two independent geophysical data sets, such as data from seismic exploration (CROP Project) and gravimetric analysis (Bouguer anomalies), is of particular interest for investigations into the deeper crust portion. In the present work gravity data modelling was used to study deep crust, constraints being provided by WARR data and by reflection seismic data obtained along the CROP04 profile that crosses the Southern Apennines (Italy) from Agropoli (SW) to Barletta (NE). A preliminary interpretation has been made of the regional gravity anomaly trend in deep crust in Southern Italy; the role of this anomaly trend as an independent constraint for the geological interpretation of the CROP04 seismic line is discussed.243 392 - PublicationOpen AccessFirst results from the CROP-11 deep seismic profile, central Apennines, Italy: evidence of mid-crustal folding(2006)
; ; ; ; ; ; ; ; ; ; ; ; ; ;Billi, A.; Dipartimento di Scienze Geologiche, Universita` 'Roma Tre', Rome, Italy ;Tiberti, M. M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Cavinato, G. P.; Istituto di Geologia Ambientale e Geoingegneria, CNR, Rome, Italy ;Cosentino, D.; Dipartimento di Scienze Geologiche, Universita` 'Roma Tre', Rome, Italy ;Di Luzio, E.; Istituto di Geologia Ambientale e Geoingegneria, CNR, Rome, Italy ;Keller, J. V. A.; ChevronTexaco Energy Technology Co., San Ramon, CA, USA ;Kluth, C.; Department of Geology and Geological Engineering, Colorado School of Mines, Golden, USA ;Orlando, L.; Dipartimento di Idraulica, Trasporti e Strade, Universita` ‘La Sapienza’, Rome, Italy ;Parotto, M.; Dipartimento di Scienze Geologiche, Universita` 'Roma Tre', Rome, Italy ;Praturlon, A.; Dipartimento di Scienze Geologiche, Universita` 'Roma Tre', Rome, Italy ;Romanelli, M.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy ;Storti, F.; Dipartimento di Scienze Geologiche, Universita` 'Roma Tre', Rome, Italy ;Wardell, N.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy; ; ; ; ; ; ; ; ; ; ; ; The CROP-11 deep seismic profile across the central Apennines, Italy, reveals a previously unknown, mid-crustal antiform here interpreted as a fault-bend fold-like structure. The seismic facies and gravity signature suggest that this structure consists of low-grade metamorphic rocks. Geomorphological, stratigraphic and tectonic evidence in the overlying shallow thrusts suggests that this structure developed in early to mid-Messinian time and grew out of sequence in late Messinian– Pliocene time. The out-of-sequence growth may reflect a taper subcriticality stage of the Apenninic thrust wedge, which induced renewed contraction in the rear.296 869 - PublicationOpen Access2D gravity modelling along the CROP11 seismic profile(2006)
; ; ;Tiberti, M. M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Orlando, L.; Dipartimento di Idraulica, Trasporti e Strade, Università “La Sapienza”, Roma, Italy; The purpose of this work is to present a gravity reconstruction of the deepest portion of the CROP 11 seismic line. The 2D gravity modelling is constrained by DSS data and by deep reflection seismic data obtained along the CROP 11 line. The role of the regional gravity anomaly trend of Central Italy as an independent constraint for the geological interpretation of the seismic line is also highlighted. The main gravity low (Fucino Plain) in the area is compensated by the combined effect of a regional deepening of both the Moho and the top of the crystalline basement, while the gravity low, located east towards the Maiella Mt., seems to originate between a 4 and 10 km depth. A lower density can be assigned to the western portion of the mantle with respect to the eastern side. The westernmost part of the upper crust in the model also shows a slightly lower density. The crystalline basement is not likely to be heavily involved in the deformation of the chain; ramp-and-flat deformations are present down to a depth of 20 km, i.e. the “highly reflective body” on the western side of the profile, which does not have a marked gravity imprint and should be due to relatively “light” sedimentary units.197 109 - 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 AccessRegional gravity anomaly map and crustal model of the Central-Southern Apennines (Italy)(2005-08)
; ; ; ; ; ;Tiberti, M. M.; Dipartimento di Scienze Geologiche, Università degli Studi "Roma Tre" ;Orlando, L.; Dipartimento di Idraulica Trasporti e Strade, Area Geofisica, Università degli Studi di Roma ;Di Bucci, D.; Dipartimento della Protezione Civile, Servizio Sismico Nazionale ;Bernabini, M.; Dipartimento di Idraulica Trasporti e Strade, Area Geofisica, Università degli Studi di Roma ;Parotto, M.; Dipartimento di Scienze Geologiche, Università degli Studi "Roma Tre"; ; ; ; The deep structures of the Central–Southern Apennines are analysed on the basis of the regional component of gravity anomalies, obtained applying a stripping technique. This procedure allows the accurate removal of the gravimetric effect of the three-dimensional shallow (within the first 10 km) geological bodies from the observed Bouguer anomaly. The resulting anomaly map differs quite significantly from the Bouguer anomaly map, providing new constraints on the nature of the deeper part of the crust and on the upper mantle. The stripping reveals that the regional gravity lows are shifted westward in comparison with Bouguer anomaly lows. Moreover, the gravimetric pattern indicates a lack of cylindrism for the deep structures of the Apennine Chain, which in the study area can be roughly divided into three main segments. The observed differences between the gravity anomalies pattern of the Central Apennines and that of the Southern Apennines are marked. The integration of gravimetric results with other geophysical data suggests that: (i) a ramp-dominated style for the buried Apulia (Adria) units and part of the underlying basement is compatible with gravimetric data and (ii) most of the regional gravity anomalies in the Central Apennines seem to originate within the lower crust.309 2011