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Bulletin of Volcanology

, Volume 72, Issue 9, pp 1021–1038 | Cite as

Pyroclastic flow hazard assessment at Somma–Vesuvius based on the geological record

  • L. Gurioli
  • R. Sulpizio
  • R. Cioni
  • A. Sbrana
  • R. Santacroce
  • W. Luperini
  • D. Andronico
Research Article

Abstract

During the past 22 ka of activity at Somma–Vesuvius, catastrophic pyroclastic density currents (PDCs) have been generated repeatedly. Examples are those that destroyed the towns of Pompeii and Ercolano in AD 79, as well as Torre del Greco and several circum-Vesuvian villages in AD 1631. Using new field data and data available from the literature, we delineate the area impacted by PDCs at Somma–Vesuvius to improve the related hazard assessment. We mainly focus on the dispersal, thickness, and extent of the PDC deposits generated during seven plinian and sub-plinian eruptions, namely, the Pomici di Base, Greenish Pumice, Pomici di Mercato, Pomici di Avellino, Pompeii Pumice, AD 472 Pollena, and AD 1631 eruptions. We present maps of the total thickness of the PDC deposits for each eruption. Five out of seven eruptions dispersed PDCs radially, sometimes showing a preferred direction controlled by the position of the vent and the paleotopography. Only the PDCs from AD 1631 eruption were influenced by the presence of the Mt Somma caldera wall which stopped their advance in a northerly direction. Most PDC deposits are located downslope of the pronounced break-in slope that marks the base of the Somma–Vesuvius cone. PDCs from the Pomici di Avellino and Pompeii Pumice eruptions have the most dispersed deposits (extending more than 20 km from the inferred vent). These deposits are relatively thin, normally graded, and stratified. In contrast, thick, massive, lithic-rich deposits are only dispersed within 7 to 8 km of the vent. Isopach maps and the deposit features reveal that PDC dispersal was strongly controlled by the intensity of the eruption (in terms of magma discharge rate), the position of the vent area with respect to the Mt Somma caldera wall, and the pre-existing topography. Facies characteristics of the PDC deposits appear to correlate with dispersal; the stratified facies are consistently dispersed more widely than the massive facies.

Keywords

Pyroclastic flow Hazard assessment Mt Somma Pyroclastic density currents Facies 

Notes

Acknowledgements

We are grateful to Benjamin van wyk de Vries for providing useful comments on earlier drafts of the manuscript and to Steve Self and Mauro Di Vito for their thorough and helpful reviews. Andrew Harris helped with the final checking of the manuscript. We thank Jocelyn McPhie for her patience, great editorial handling, and the careful final editing of the manuscript. We gratefully acknowledge support from the Somma–Vesuvius CARG Project (grant to R. Santacroce). R. Cioni, L. Gurioli, and R. Sulpizio completed their field work while still working at Dip. di Scienze della Terra, University of Pisa (Italy).

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • L. Gurioli
    • 1
    • 2
    • 3
  • R. Sulpizio
    • 4
  • R. Cioni
    • 5
  • A. Sbrana
    • 6
  • R. Santacroce
    • 6
  • W. Luperini
    • 6
  • D. Andronico
    • 7
  1. 1.Clermont Université, Université Blaise Pascal, Laboratoire Magmas et VolcansClermont-FerrandFrance
  2. 2.CNRS, UMR 6524, LMVClermont-FerrandFrance
  3. 3.IRD, R 163, LMVClermont-FerrandFrance
  4. 4.CIRISIVU, c/o Dipartimento GeomineralogicoBariItaly
  5. 5.Dipartimento di Scienze della TerraCagliariItaly
  6. 6.Dipartimento di Scienze della TerraPisaItaly
  7. 7.INGV sezione di Catania Piazza Roma, 2CataniaItaly

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