1,720,961 research outputs found
CARATTERIZZAZIONE SISMOTETTONICA DELL'AREA DI GIUNZIONE TRA IL SUDALPINO E LE DINARIDI (NE ITALIA)
No full textL’attività tettonica recente del Friuli orientale è stata indagata tramite un approccio multidisciplinare. L’ara di studio, che comprende la Pianura Friulana orientale e il bordo Prealpino Giulio, rappresenta la zona di giunzione tra i fronti SSE vergenti della Catena Sudalpina e le strutture trascorrenti destre NW-SE del Friuli orientale e Slovenia occidentale. Attualmente, sia i dati GPS che sismologici mostrano che la deformazione che si accumula ad una velocità di 2-3 mm/a viene rilasciata dall’interazione tra faglie inverse e trascorrenti. Riguardo la sismicità, la distribuzione dei terremoti mostra che gran parte degli eventi è localizzata lungo l’arco alpino e prealpino e che almeno due terremoti forti (M>6) hanno colpito l’area di studio: il terremoto del 1511 (Mw 6.3) e la sequenza del 1976-1977 (Mw 6.0 events are documented: the 1511 Mw 6.3 earthquake and the 1976-77 sequence (Mw ≤ 6.4). In more recent times, the activation of the Raune strike-slip fault in western Slovenia caused the occurrence of two seismic sequences, in 1998 (Mw 5.6) and 2004 (Mw 5.2). With the aim to further explore the involvement of the active faults of eastern Friuli during the strongest seismic events occurred in the area, this work is focused on the recent activity of the tectonic structures. Following a multidisciplinary approach, the deep 3D-geometry of 4 main fault-systems were reconstructed by combining ENI seismic lines interpretation and hypocentral distribution analysis. Successively, a morphotectonic survey was conducted along the Julian prealpine border with the aim to detect the surficial anomalies related to tectonic activity. The collected morphotectonic hints allowed to define a NW-SE elongated zone of surficial deformation, highlighting the recent activity of the Colle Villano-N Thrust (CV-N) and the Colle Villano-Borgo Faris-Cividale trasnpressive Fault-System (CV-BFC). Based on the morphostructural results, two paleoseismological trenches were dug: the Fraelacco trench across the CV-N Thrust and the Campeglio trench across the CV Thrust. At Campeglio site, the excavated trench revealed the presence of paleoliquefaction features, thus suggesting that the area experienced seismic shaking. Differently, at Fraelacco site, the displacement of the Canodusso Subsynthem (21- 23 ka cal BP) allowed to identify two deformative episodes in the last 21 ka, with the latest likely occurred in historical times
Evidence for Quaternary tectonic activity from the reconstruction of the buried quaternary bottom surface in the North-Eastern corner of the Friuli plain (NE Italy)
No full textThis study deals with the reconstruction of the buried north-easternmost sector of the Friuli plain, through
the analysis of seismic and wells subsurface data. The interest was focused on the most recent stratigraphical
horizon, here interpreted as the bottom of the Quaternary succession, with the aim to detect the Quaternary
activity of the main faults.
The eastern Friuli-western Slovenia area is characterized by the interaction of two different deformational
systems: in the western sector prevails thrust activity, in the eastern one dominates strike slip tectonics. Main
fault-systems show an about E-W trending in the W-sector and a NW-SE trending in the eastern one. Both
deformational systems are subjected to NNW-SSE compressional regime (Serpelloni et al, 2016), responsible
of their reverse or transcurrent/transpressive kinematics. Their activity is testified by the recent and historical
seismicity of the area (Mw6.63, 1348; Mw6.32, 1511; Mw6.45, 1976) (Rovida et al, 2016), but their
seismogenic role is still not completely clear. In this contest, Quaternary activity has been assumed for the
Susans Tricesimo thrust (Poli & Zanferrari, 2017), while recent paleoseismological investigations revealed
Quaternary dislocations on the Colle Villano thrust (Falcucci et al, 2018).
In this study industrial seismic lines interpretation, together with deep well logs data, allowed to reconstruct
the geometry of the main stratigraphical horizons (from the top Cretaceous-Paleogenic carbonatic platform to
the Quaternary base) and the main tectonic structures of the buried eastern Friuli plain. In particular, through the
implementation of well logs data it was possible to reconstruct the thickness of the buried alluvial Quaternary
deposits and to identify the tectonic influence on the bottom of the Quaternary surface. By merging these new
data with morphotectonic and field observations, the main buried active faults of the area were detected and
possible estimates of their activity rates were performed
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Structural Complexity and Seismogenesis: The Role of the Transpressive Structures in the 1976 Friuli Earthquakes (Eastern Southern Alps, NE Italy)
Get PDFWe reconstructed the seismotectonic setting of the area comprising the northeastern Friuli Plain and the Julian pre-Alpine border (NE Italy) by integrating geological and seismological data. The study area represents the junction between the SSE-verging polyphase thrust-front of the south-Alpine Chain and the NW–SE-trending strike-slip faults of the eastern Friuli–western Slovenia domain. Following a multidisciplinary approach, the 3D geometry of the Susans–Tricesimo thrust system was reconstructed through the elaboration of four geological cross sections derived from the interpretation of ENI industrial seismic lines. In a second step, the seismogenic volume of the central-eastern Friuli area was investigated through hypocentral distribution analysis: the seismic events of the latest 50 years (1976–1977 and 1978–2019 time intervals) were plotted on four NE-SW-oriented seriated sections together with the fault plane’s geometry. Through this procedure, we were able to investigate the relationship between the NW-SE-striking high-angle faults, which characterize the northern Julian pre-Alps, and the WSW-verging medium-angle reverse fronts located at the piedmont of the Friuli plain, which experienced NW-SE- to NNW-SSE-oriented compression starting at least from the Pliocene. In detail, we examined the involvement of these structures during the seismic sequences of May and September 1976, in terms of activation and/or interaction. The resulting seismotectonic model highlights the interplay between transpressive/strike-slip and reverse planes. In particular, this study suggests that Predjama and Maniaglia transpressive faults strongly control the stress release and likely played a fundamental role both during the 6 May (Mw 6.5) and 15 September (Mw 6.0) Friuli earthquakes
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
First evidence of Holocene activity and surface diplacement of the Budoia-Aviano Thrust System in north-eastern Italy, unravelled through the integration of geological, geophysic and paleoseismological analyses
No full textWe present the findings of a multimethodological study made on the Budoia-Aviano Thrust System conducted as part of the NASA4SHA PRIN Project “Fault segmentation and seismotectonics
of active thrust systems: the Northern Apennines and Southern Alps laboratories for new Seismic Hazard Assessments in northern Italy
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