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Volume partition between the plinian and co-ignimbrite air-fall deposits of the CI eruption.
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Volume partition between the plinian and co-ignimbrite air-fall deposits of the CI eruption.
No full textErosional characteristics and behaviour of large pyroclastic density currents
No full textFactors infl uencing the erosive behavior of large pyroclastic
density currents (PDCs), both mainly massive and thinly stratifi ed, are not well understood. To investigate the parameters infl uencing the erosive behavior of PDCs produced during the fl owing phase of large, caldera-forming Plinian (Campanian Ignimbrite) and phreatoplinian (Neapolitan Yellow Tuff) eruptions, we use scoured fall deposits at the base of, or interstratifi ed with, PDC deposits from the Campanian region of Italy. At several localities, we calculated the depth of PDC erosion by comparing the measured thickness of eroded remnants to reconstructed thickness at each site (estimated by isopach mapping), and recorded the (1) distance from vent, (2) elevation of the locality, and (3) paleoslopes. Furthermore, we have considered how these factors can be infl uenced by outcrop exposure.
Depth of erosion correlates with distance from the vent in low-relief landscape, while across very rugged topography the only related parameter is elevation. The different erosive patterns appear to show how pyroclastic currents interact with the topography in the surrounding terrain. When a PDC crosses relatively fl at surfaces, it decelerates away from the vent, decreasing its erosive capacity; but when moving through steep terrain, a PDC accelerates down the valley, increasing its erosive capacity
The dynamics of the Breccia Museo eruption (Campi Flegrei, Italy) and the significance of spatter clasts associated with lithic breccias.
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Rarità d’archivio: su alcuni frammenti manoscritti del Falconetto
No full textDescrizione ed edizione dei frammenti manoscritti del poema cavalleresco "Falconetto" (XV sec.) riemersi presso l'Archivio Storico di Vercelli, con una contestualizzazione storico-letteraria del testo nell'ambito della produzione cavalleresca destinata all'esecuzione orale nel secondo Quattrocento
The dynamics of the Breccia Museo eruption (Campi Flegrei, Italy) and the significance of spatter clasts associated with lithic breccias.
No full text- …
