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Universita' Politecnica delle Marche
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- PublicationRestrictedMediterranean sapropels: a mere geological problem or a resource for the study of a changing planet?(2012-01)
; ; ; ;Negri, A.; Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche, Ancona (Italy) ;Colleoni, F.; Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna (Italy) ;Masina, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; ; Sapropels are sediments rich in organic carbon occurring cyclically in the Mediterranean marine records and whose origin has been matter of great debate during the last decades. While the first sapropels were found in eastern Mediterranean sediments from the Miocene period, in this paper we focus on the layers that were subsequently found in sediment cores of Pliocene to Quaternary age from the eastern Mediterranean mostly. Since the very beginning of the history of studies on sapropels, authors inferred that those lev- els, being interbedded as dark layers in more or less normal light “open marine” sediments, formed during short-lived but catastrophic alterations in Mediterranean oceanographic conditions, probably linked to broader climate changes. In this paper, the main hypotheses regarding the origin of those sediments are described and we highlight the importance of sapropel records for the study of climatic and oceanographic variability in the Mediterranean area in the context of global climate change.325 75 - PublicationRestrictedSeismic damage to pipelines in the framework of Na-Tech risk assessment(2015)
; ; ; ; ;Lanzano, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Santucci de Magistris, F.; Università degli Studi del Molise ;Fabbrocino, G.; Università degli Studi del Molise ;Salzano, E.; Istituto di Ricerche sulla Combustione, CNR; ; ; The structural integrity of pipelines undergone seismic waves is crucial for industrial installation and for the distributed transportation networks of gaseous and liquid fluids. However, it is nowadays proved that the definition of seismic vulnerability based on purely, structural-derived limit states or on return-to-service or even on the purely economic repair rate indications, is not sufficient for the holistic analysis of risks. On the other hand, detailed numerical studies based on full analyses (including fluid/soil/structure interaction) are too expensive for the aims of risk assessment and simplified methodologies are still needed.In this paper, a large database of earthquake-induced damage for steel and non-steel pipelines is presented. Each case was analyzed and collected from post-earthquake reconnaissance, seismic engineering reports and technical papers. The database may be adopted for the definition of specific vulnerability function (fragility curves), which are commonly implemented in multi-hazard analyses, and more in general for the assessment of Na-Tech risks (Natural events triggering Technological disasters). Seismic damage to pipelines in the framework of Na-Tech risk assessment. Available from: https://www.researchgate.net/publication/271673585_Seismic_damage_to_pipelines_in_the_framework_of_Na-Tech_risk_assessment [accessed Jun 12, 2015].160 38 - PublicationRestrictedSPT blow count vs. shear wave velocity relationship in the structurally complex formations of the Molise Region (Italy)(2015)
; ; ; ; ; ; ; ; ;The relationship between the shear wave velocity (VS) and the blow number of the Standard Penetration Tests (NSPT) was investigated with reference to the structurally complex formations located in a wide sector of the Southern Apennine chain (Molise Region, Italy). Novel NSPT–VS correlations were developed, based on a balanced number of in situ tests coming from the seismic microzonation of the municipalities of Campobasso District and the seismic vulnerability assessment of strategic road infrastructures. It was proven that available relationships were not able to fit the data in the area of interest, even making the analysis according to the soil grain size clas- sification. This circumstance was related to the nature of the geological formations, which are chaotically built and affected by complex structural–textural and lithological characteristics. Hence, in this paper, a rational meth- odology for an integrated geological and geotechnical assessment of the available field data based on lithostratigraphical features was presented and discussed. Three original empirical NSPT–VS power function rela- tionships were derived and distinguished depending on the main lithofacies recognized in the Campobasso Dis- trict, corresponding to Structured Soil Deposit (SSD), All Soils (AS) and Weathered Soils (WS). Their validation through statistical assessment of data confirmed the relevance of the results and the advantages related to their use at regional scale, based on an integrated geological and geotechnical approach.71 6 - PublicationRestrictedA geolithological approach to seismic site classification: an application to the Molise Region (Italy)Seismic site classification is a critical issue in order to reliably predict seismic ground motion parameters for the development of microzonation maps and site-specific hazard studies, addressed to territorial planning, real-time generation of shaking maps, and seismic design of engineering structures. The equivalent shear wave velocity through the topmost 30 m (VS30) is commonly assumed as the reference parameter to provide practical site classifications. Different approaches aimed at expressing local site conditions in terms of VS30 exist. Overall geological and morphological characteristics are often suggested in the technical literature as proxy to infer VS30 at a regional scale. In this study, the reliability of two commonly accepted approaches based either on the topographic slope proxy or on a basic geological classification was assessed with reference to a well-documented case study, the Molise Region (Italy). A comprehensive database of Down-Hole tests was collected, validated and processed in order to compare measured VS30 values with those inferred from proxy-based approaches. Furthermore, an up-to-date review of the geology of the area was carried out, and a novel methodology based on a geolithological approach was proposed for site classification at a regional scale. The methodology is based on the definition of a set of homogeneous geolithological complexes, and on their classification according to a statistical analysis of the measured VS30 and of the bedrock depth. Original maps of the seismic ground types were developed following classification criteria based upon the European building code for seismic design (EC8) and relevant modifications proposed in the literature. The comparison of the results obtained by the geolithological approach versus those deriving from the application of the above mentioned proxies pointed out an enhanced capability of the proposed method to fit the distribution of ground types, as assessed on the basis of the VS30 values measured in the reference area.
108 6 - PublicationRestrictedPlio-Pliocene high-low latitude climate interplay: a Mediterranean point of view(2012-02)
; ; ; ; ;Colleoni, F.; Centro Euro-Mediterraneo sui Cambiamenti Climatici ;Masina, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Negri, A.; Universita' Politecnica delle Marche ;Marzocchi, A.; Centro Euro-Mediterraneo sui Cambiamenti Climatici; ; ; The high–low latitude climate interplay during the Plio–Pleistocene global cooling is not yet well understood. Insight on the Mediterranean region can provide some clues about past significant climate changes since the basin reflects the climate dynamics of both high-latitude and low-latitude regions, being connected to the North Atlantic and subjected to monsoon influence. Here we shade light on this connection problem by per- forming a spectral analysis on an Eastern Mediterranean stack of planktonic records spanning the last 5 Ma and by further comparing it to North Atlantic and Pacific deep- and surface-water records. Our main conclu- sion is that the Mediterranean detected the main global climate transitions over the last 5 Myr although sapropel depositions indicate that it remained influenced by the African summer monsoon during the whole interval. Our analysis reveals that until 2.2 Ma the Mediterranean planktonic record is driven by re- gional processes dominated by precession. The progressive emergence of the 41-kyr frequency in the Medi- terranean records around 2.8 Ma suggests that, since this date, the Mediterranean was more and more affected by the high-latitude climate dynamics forcing than by the low-latitude one. Moreover, during the ongoing Plio–Pleistocene cooling, the 41-kyr frequency signal in the Mediterranean records anticipated high-latitude deep-water response to the intensification of the Northern Hemisphere Glaciations (NHG) and lagged the signal in tropical latitudes. Finally, toward 1.2 Ma the results suggest that the progressive shift from the 41-kyr to the 100-kyr frequency was led by the northern high latitudes. Overall, our results confirm that the Mediterranean is an ideal site to study the interplay between high and low latitude climates.313 56 - PublicationOpen AccessConservation and Enhancement of the Pietrabbondante Archaeological Site between History, Geology and Emerging Crowd-Based Digital Technologies(2022)
; ; ; ; ; Attention to the condition assessment and conservation of cultural heritage is increasing due to growing sensitivity to the preservation of the built and natural environment and awareness of the risks associated with natural hazards. In this context, a comprehensive approach to the conservation and valorization of cultural heritage requires the combined action of different skills to achieve reliable assessment of the conditions of valuable assets and sites based on qualitative and quantitative indicators. This paper explores the issues of conservation and sustainable management of archaeological sites, considering humanistic and technical aspects. It reviews the current rules and practices concerning the maintenance and administration of archaeological heritage and outlines the implementation of a novel procedure, based on low-cost tools, to assess and describe the current condition of archaeological assets. Specific attention is paid to the interaction between experts and researchers operating in both humanistic and technical fields and to the knowledge and data contribution available on modern web-based platforms to implement reliable and low-cost data acquisition for the development of worthwhile plans for the conservation and enhancement of cultural heritage. The Samnite complex of Pietrabbondante, Molise, South Italy, is employed to apply and check the proposed tools in the real world49 13 - PublicationRestrictedResponse to comment by Hilgen et al.: Integrated stratigraphy and pitfalls of automated tuning(2014-02)
; ; ; ; ;Colleoni, F.; Ctr Euromediterraneo Cambiamenti Climatici, Bologna, Italy ;Masina, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Negri, A.; Univ Politecn Marche, Dipartimento Sci Vita & Ambiente, Ancona, Italy ;Marzocchi, A.; Univ Bristol, Sch Geog Sci, Bristol, Avon, England; ; ; First of all we thank Hilgen and co-authors for their interest in our manuscript. Here we provide an answer to their comment in order to prove the robustness of our conclusions, despite the tuning process that we performed on the original MEDSTACK from Lourens et al. (2004) and Wang et al. (2010).252 71 - PublicationOpen AccessSeismic hazard disaggregation in the Molise region, Italy: the case study of Campobasso(2010)
; ; ; ; ;Caccavale; Dipartimento di Scienze Fisiche; Dipartimento di Scienze Fisiche, M.; Dipartimento di Scienze Fisiche, Università Federico II di Napoli, Italy. ;Convertito, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Mancini, M.; Structural and Geotechnical Dynamic Lab StreGa,- University of Molise. ;Fabbrocino, G.; Structural and Geotechnical Dyn; ; ; Large scale experimentations play a relevant role in the earthquake engineering research, similarly Structural Health Monitoring is able to give information of real structures. A few geotechnical structures are documented, because only data on seismic permanent deformations are available. The present paper deals with seismic hazard of the site of the Student House at University of Molise, where a geotechnical monitoring system has been designed and is currently under implementation. It is aimed at refining the seismic hazard characterization for identifying a set of relevant earthquakes for the theoretical analysis of the structure. Reference earthquakes expressed in terms of magnitude (M), distance (R) and ε, were therefore investigated. Uniform hazard spectra at different structural periods for a 475-year return period were disaggregated. Shapes of both the joint and marginal probability density functions were studied and the first two modes of M, R and ε were extracted and discussed.169 338 - PublicationOpen AccessEvaluating the structural priorities for the seismic vulnerability of civilian and industrial wastewater treatment plantsWastewater disposal systems are complex systems composed by several interconnected elements. In the aftermath of dramatic natural events, such as the earthquake, the failure of any of these elements can result in the deterioration of the environment as well as in the risk for the exposed population, due to leakage of untreated or un-properly treated wastewater on soil and/or its discharge into superficial waters. This paper presents a multi-disciplinary methodology for the evaluation of the seismic vulnerability of municipal or industrial wastewater treatment plants, based on damage observation of available earth- quake reports. Specific fragility curves and threshold values expressed in terms of Peak Ground Acceleration (PGA) are presented and compared with existing functions. The methodology fully comply requirements of most relevant and effective risk analysis tools or for land-use planning and can be adopted for the definition of structural priorities of plants.
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