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Offshore debris avalanches at Somma-Vesuvius volcano (Italy): Implications for hazard evaluation. (Articolo in rivista)

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Offshore debris avalanches at Somma-Vesuvius volcano (Italy): Implications for hazard evaluation. (Articolo in rivista) (literal)

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Milia A., Torrente M.M., Zuppetta A. (2003)
Offshore debris avalanches at Somma-Vesuvius volcano (Italy): Implications for hazard evaluation.
in Journal of the Geological Society (Lond.)
(literal)

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The interpretation of high-resolution seismic reflection profiles collected in Naples Bay permits, for the first time, the documentation of two debris avalanches originating from Somma-Vesuvius volcano and interlayered with marine sediments.The two debris avalanches from the Somma-Vesuvius volcano are rare examples of debris avalanches that were stored in shallow water on account of their failure to reach the slope due to the wide continental shelf. The identification of these debris avalanches implies that two flank collapses occurred during the evolution of Somma-Vesuvius volcano. We postulate that the older debris avalanche is associated with the 18 ka-old Pomici di Base eruption and the younger one with the 3.4 ka-old Avellino eruption. The two debris avalanches show different stratigraphic features that result strictly correlated to the sea level position. The occurrence of flank collapses in the history of Somma-Vesuvius implies numerous potential hazards associated with a lateral collapse, i.e. hazards deriving from an explosive eruption, the debris avalanche itself and avalanche-induced tsunamis. Indeed, large volcanic debris avalanches are characterized by great mobility and high speed, leaving little time for evacuation after slope failure. Furthermore, associated tsunamis can extend the impact of the eruption over large areas near coastal volcanoes. (literal)

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Milia A., IAMC, CNR, Calata Porta di Massa 80133 Napoli Torrente MM., Dip. Studi Geologici ed Ambientali, Università del Sannio, Benevento Zuppetta A., Dip. Studi Geologici ed Ambientali, Università del Sannio, Benevento (literal)

Titolo

Offshore debris avalanches at Somma-Vesuvius volcano (Italy): Implications for hazard evaluation. (literal)

Abstract

Somma-Vesuvius is an active volcano with a breached crater close to the continental shelf of Naples Bay, Italy. The interpretation of high-resolution seismic profiles offshore of Somma-Vesuvius documents interlayered volcanic and marine units in the Late Quaternary succession. In particular, the detailed seismo-stratigraphic analysis permitted, for the first time, the identification and mapping of two thick debris avalanche deposits located on the continental shelf. With a volume of 2.9 km3, the older debris avalanche, linked to the 18 ka-old Pomici di Base plinian eruption, was emplaced in a subaerial environment and then overlain by the sedimentary deposits of the lowstand prograding wedge. The younger debris avalanche, linked to the 3.4 ka-old Avellino plinian eruption, has a volume of approximately 1 km3 and is interlayered within the marine sediments deposited during the sea level highstand. The identification of two debris avalanches originating from Somma-Vesuvius has two important implications: i) the occurrence of two sector collapses in the history of Somma-Vesuvius volcano; ii) a potential volcano slope failure and consequent tsunamis produced by the entry of a debris avalanche into Naples Bay should be considered in the volcanic hazard evaluation of this densely populated area. (literal)

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