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Skrame, Klodian
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Skrame, Klodian
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- PublicationRestrictedA Multidisciplinary approach for the determination of subsurface structure of Leonessa Plain (Central Appennines, Italy).n this study, detailed gravity survey and microtremor observations were made to map and model the thickness of Quaternary deposits (gravel, sand and clay) overlaying the Meso-Cenozoic pelagic basin deposits of the Leonessa plain. The study involved a test area of 50 km2 occupied by 300 gravity stations and by 30 sites of 3-component single-site observations. Stations were accurately located with differential GPS that provided centimetric accuracy in elevation. The microtremor data were analyzed by means of the horizontal-to-vertical spectral ratio (H/V). A realistic density of the unconsolidated Quaternary deposits (1.75-2,00 g/cm3) determined on core samples and a density of 2.60 g/cm3 for the basement limestone were used to constrain the 2D gravimetric models. The gravity and microtremor data were compared with a collection of existing well logs and geophysical data. The 2D models match quite well with the information determined from the previous works. The data obtained with these different methodological approaches allowed us to reconstruct the geometry of the depression and to evaluate the thickness of the Quaternary sedimentary infilling. Finally, on the basis of the obtained morphology, we were able to reproduce and to define the 3D model and the Quaternary evolution of the Leonessa plain.
132 16 - PublicationOpen AccessNew bedrock surface topography map of the Rieti Plain.The new bedrock surface topography map of RP provides a new more detailed and representative image of the buried morphology, and gives a more accurate evaluation of the thickness of the Quaternary sedimentary infilling.
53 25 - PublicationOpen AccessArchaeological geophysics investigations of the Villa degli Antonini and Rota Ria Archaeological sites.(2019-09-10)
; ; ; ; ; ; ; ; ; A research approach that integrated different geophysical methods for archaeological prospection was carried out to understand the nature and chronological development of the curvilinear structure in the archaeological site of “Villa degli Antonini” (Genzano di Roma, Italy) (hereafter VA), and the finding of the settlement structure in the archaeological site of Rota Ria (Mugnano in Teverina, Viterbo, Italy) (hereafter RR) (SKRAME et al., 2016). To this purpose a detailed magnetic prospecting survey was carried out since the walls of the curvilinear structure are made of volcanic rocks, such as lava and tuffs of local provenience, that induce a very high degree of magnetization. Even in the RR archaeological framework, both the geological environment and the buried walls made of peperino and tuff blocks, suggested the use of magnetic prospecting survey. In order to determine the exact shape and therefore the best excavation strategy for these buried archaeological structures, a series of different geophysical investigations (Electromagnetic (EMI) and Ground penetrating radar survey (GPR)) were carried out. The final step of the investigation was the excavation in the targeted sector of the study areas in order to test the validity of the geophysical interpretations. The most interesting result was that, in both cases, the excavations have confirmed the results obtained during the magnetic surveying.78 42 - PublicationOpen AccessNew Gravimetrical Map of The Rieti Intra-Mountain Basin (Central Apennines, Italy)This paper describes the acquisition of the gravity data and their analysis to model and map the bedrock configuration of the Rieti Basin (hereafter RB); a typical intra-mountain tectonic depression of Central Apennines in Italy, related to a still active tectonic extensional regime. The study involved a test area of 35 km2 occupied by 110 gravity stations. The new gravity measurements were merged with the gravity data of the 358 gravity stations collected during the 1995 gravity survey (Ciccollella et al., 1995). The gravity data resulted from the network adjustment were used to calculate the Bouguer anomaly map. To realize the 2-D gravimetric models of the RB, a realistic density of 2,15 g/cm3 for the unconsolidated Quaternary deposits, a density of 2.50 g/cm3 for the Travertine and a density of 2.60 g/cm3 for the Meso-Cenozoic pelagic basin deposits were used (Skrame, 2011). The models obtained matched quite well with the exiting geological and geophysical data. The new bedrock surface topography map of RB provides a new more detailed and representative image of the buried morphology, and gives a more accurate evaluation of the thickness of the Plio-Quaternary sedimentary infilling.
37 44 - PublicationOpen AccessContribution of the Magnetic Horizontal Gradient Operator (MHGO) for the Interpretation of the Magnetic AnomaliesIn this paper, we propose a high-resolution approach for detecting magnetic source boundaries. It depends on the application of the magnetic horizontal gradient operator (MHGO). The MHGO emphasizes the source effects, reducing the interference effects of the anomalies and yield an enhanced image of the boundaries. In order to illustrate the efficiency of the method, we describe the results obtained on the two archaeological sites: “Villa degli Antonini” (Genzano, Rome) and Rota Ria (Mugnano in Teverina, Viterbo) by the application of the detailed magnetic surveying. The results obtained have shown that the source boundaries locations are more precisely determined compared to those obtained with other known techniques which use the vertical gradient of the magnetic field. Since the main goal of the investigation was to understand and to high light the nature of the magnetic anomalies, different geophysical techniques (Electromagnetic and Ground penetrating radar surveying) were carried out. The final step of the investigation was the excavation in the targeted sector of the study areas in order to test the validity of the geophysical interpretations. The most interesting result was that, in both cases, the excavations have confirmed the results obtained during the magnetic surveying.
62 32 - PublicationOpen AccessSprofondamenti in area urbana: il caso del Parco Yitzhak Rabin (Via Panama, Roma)(2014-05)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ; ; ;; ; ; ; ; ; ; Il Servizio Difesa del Suolo- Provincia di Roma e l’Istituto Nazionale di Geofisica e Vulcanologia, nell’ambito di un protocollo d’intesa finalizzato alla “Caratterizzazione geologico-tecnica e geofisica di siti interessati da Sinkholes e da eventi franosi nell’ambito del territorio della Provincia di Roma” hanno avviato congiuntamente al Dipartimento di Scienze della Terra- Sapienza- Università di Roma una campagna di indagini multidisciplinari in siti soggetti a sprofondamenti sia naturali, sia di origine antropica. Un caso di particolare rilevanza è quello del parco Ytzhak Rabin, nell’area urbana di Roma, dove nel Settembre 2012 è stata rilevata la prima evidenza di due sprofondamenti, sino ad allora non censiti nell’area. Il parco Ytzhak Rabin si trova nel Municipio II, tra via Panama e via Salaria, ed è contiguo a Villa Ada. Il fenomeno, segnalato tempestivamente alle autorità competenti, merita particolare attenzione in quanto la villa è intensamente frequentata e gli sprofondamenti sono ubicati a breve distanza da un’area giochi attrezzata. Nei mesi successivi è stata osservata l’evoluzione tramite sopralluoghi periodici, constatando l’ampliamento delle prime voragini di forma allungata e la formazione di nuove lungo un allineamento circa WNW-ESE, censendone ad oggi 15, di cui almeno 5 con oltre 2 m diametro.71 23