FTI.4 | Landslides and volcanism: the fragility of the Neapolitan territory

View on the Somma-Vesuvius volcano from Naples. In the inset a recent (2005) landslide.

The field trip will start with a general view on the two Neapolitan active volcanoes: the Campi Flegrei caldera and the Somma-Vesuvius strato-volcano. Small landslides to large debris flows and debris avalanches affected the Neapolitan territory surrounding these active volcanoes. Their variable intensity explosive eruptions produced significant quantities of loose pyroclastic material on the slopes of the volcanoes and of the surrounding reliefs. A very complete sequence of the Vesuvius Plinian eruptions will be shown. Remobilization processes of this material occurred during and soon after large explosive eruptions, although their intensity and frequency decreased during inter-eruptive periods. The intensity of these processes varies with the different eruptions and is strongly dependent by availability of fine ash in proximal and distal areas. The areas involved varies from hundreds to millions square meters. The syn-eruptive debris flows of the Vesuvius 472 AD eruption will be described in detail in the city of Nola. In particular will be visited the Nola amphiteather, which contains traces of several renovations until the moment when it was abandoned at the beginning of the 5th century AD and after was strongly affected by the 472 AD eruption. Furthermore the recent (May 1998) debris flows in one of the areas (Sarno) mostly affected by syn-eruptive and post-eruptive debris flows will be shown.
The field trip will start with a general view on the two Neapolitan active volcanoes: the Campi Flegrei caldera and the Somma-Vesuvius strato-volcano. Small landslides to large debris flows and debris avalanches affected the Neapolitan territory surrounding these active volcanoes. Their variable intensity explosive eruptions produced significant quantities of loose pyroclastic material on the slopes of the volcanoes and of the surrounding reliefs. A very complete sequence of the Vesuvius Plinian eruptions will be shown. Remobilization processes of this material occurred during and soon after large explosive eruptions, although their intensity and frequency decreased during inter-eruptive periods. The intensity of these processes varies with the different eruptions and is strongly dependent by availability of fine ash in proximal and distal areas. The areas involved varies from hundreds to millions square meters. The syn-eruptive debris flows of the Vesuvius 472 AD eruption will be described in detail in the city of Nola. In particular will be visited the Nola amphiteather, which contains traces of several renovations until the moment when it was abandoned at the beginning of the 5th century AD and after was strongly affected by the 472 AD eruption. Furthermore the recent (May 1998) debris flows in one of the areas (Sarno) mostly affected by syn-eruptive and post-eruptive debris flows will be shown.

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