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Geological and geomorphological features of landslides affecting the area of Cortina d'Ampezzo (Dolomites, Italy)
No full textThe paper shows the results of geological and geomorphological investigations recently carried out in the area of Cortina d'Ampezzo (Dolomites, Northern Italy). The study is part of European research projects aiming at the recognition and characterisation of mass movements. The stratigraphical and structural conditions of the study area greatly influenced slope evolution after the retreat of glaciers, favouring the development of large gravitational processes. The geological structure of the area is, in fact, characterised on the one hand by a repeated succession of pelitic rocks and dolomites and on the other hand by the wide presence of pelitic terms (even if largely covered by superficial deposits) in the lower part of the basin. Landslide deposits, which form most of the outcropping Quaternary deposits, have been grouped into "landslide units", in order to make easier the understanding of the complex slope evolution occurred since the Late-glacial period. A "landslide unit" has been defined in this paper as the association of landslide accumulations strictly connected in space and time: it can consist of a single main landslide and successive reactivations or of a superimposition of accumulations caused by repeated activations of a main scarp. The characteristics and distinctive aspects of landslide units are given. Several landslides have been radiocarbon dated. Age and borehole data contributed substantially to the reconstruction of the geomorphological evolution of the area. In particular, they have shown a number of landslides distributed in two main periods. The first ranges between 10,000 and 8,000 years B.P. when, after the retreat of the glaciers, rock walls no longer sustained by the ice masses became prone to landsliding, giving rise to several large-scale mass movements. These consist of rock slides and rock avalanches of considerable size detached from the steep rock walls surrounding Cortina d'Ampezzo. These events have left clear morphological evidence in the landscape, because of their magnitude and the characteristics of the rock masses involved (dolomites). The second period ranges between 5,000 and 4,000 years B.P. when smaller and slower landslides took place generally affecting the pelitic rocks of the lower part of the slopes. The concentration of landslides in this period is likely to be connected to the wetter climatic phase which occurred during the Upper Atlantic which made the slopes more prone to landsliding. At present the area of Cortina d'Ampezzo is still affected by active landslides which, owing to their potential risk for human activities, are monitored by means of automatic surveying systems
La successione terrigena ladino-carnica di Passo Duran (Dolomiti, Belluno): un'ipotesi di lavoro
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The Piz da Peres section (Valdaora-Olang, Pusteria Valley, Italy). A reappraisal of the Anisian stratigraphy in the Dolomites
No full textA redefinition of the lithostratigraphy is made, and the presence of three terrigenous units of different ages (Piz da Peres Conglomerate, Voltago Conglomerate and Richthofen Conglomerate), as well as two carbonate platforms (Upper Serla Formation and Contrin Formation), is documented. This stratigraphic setting correlates well with other Anisian sections outcropping in the Dolomites and in the Recoaro area. Using sequence stratigraphy as an intergrated approach, four Anisian depositional sequences are identified. Preliminary results indicate that these sequences can be recognized throughout the Dolomites and the Recoaro area, and might even extend to the Southern Alps. -AuthorsIn the Piz da Peres area (Valdaora-Olang, Pusteria Valley, Italy) an Anisian succession is exposed,A redefinition of the lithostratigraphy is made, and the presence of three terrigenous units of different ages (Piz da Peres Conglomerate, Voltago Conglomerate and Richthofen Conglomerate), as well as two carbonate platforms (Upper Serla Formation and Contrin Formation), is documented. This stratigraphic setting correlates well with other Anisian sections outcropping in the Dolomites and in the Recoaro area.Using sequence stratigraphy as an integrated approach, four Anisian depositional sequences are identified. Preliminary results indicate that these sequences can be recognized throughout the Dolomites and the Recoaro area, and might even extend to the Southern Alps
Indagini preliminari per la definizione della pericolosità da frana nella conca di Corvara in Badia (Dolomiti).
No full textLa presente nota costituisce dunque un contributo preliminare ai fini della valutazione della pericolosità da frana nella conca di Corvara in Badia. In particolare, dopo una descrizione delle caratteristiche geologiche e geomorfologiche, viene illustrata la frana di Corvara, il dissesto più imponente dell’Alta Badia. Lo studio di tale fenomeno presenta importanti risvolti applicativi sia perché il piede dell'accumulo lambisce l'abitato di Corvara sia perché sono interessati dal movimento la strada statale che scende dal Passo di Campolongo e alcuni impianti di risalita. Il presente studio si inserisce nell'ambito del progetto NEWTECH (“New technologies for landslide hazard assessment and management in Europe”) finanziato dalla Commissione Europea, DG XII, nell’ambito del Programma ENVIRONMENT & CLIMATE
Guida alle escursioni del IV Seminario. Cortina d'Ampezzo (BL), 25-28 settembre 1990
No full textDopo un inquadramento geologico dell'area di Cortina d'Ampezzo, vengono illustrati casi di deformazioni gravitative profonde di versante e frane nel territorio oggetto di un'escursione del Gruppo Informale D.G.P.V. del CNR
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
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