Skip to Main Content
Book Chapter

The Holocene syneruptive volcaniclastic debris flows in the Vesuvian area: Geological data as a guide for hazard assessment

By
Roberto Sulpizio
Roberto Sulpizio
Dipartimento Geomineralogico, Università di Bari, via Orabona 4, 70100 Bari, Italy
Search for other works by this author on:
Giovanni Zanchetta
Giovanni Zanchetta
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 56, 56126 Pisa, Italy
Search for other works by this author on:
Federica Demi
Federica Demi
Istituto di Geoscienze e Georisorse—CNR, via Moruzzi 1, 56100 Pisa, Italy
Search for other works by this author on:
Mauro A. Di Vito
Mauro A. Di Vito
Osservatorio Vesuviano, Via Diocleziano 328, Naples 80124, Italy
Search for other works by this author on:
Maria T. Pareschi
Maria T. Pareschi
Istituto Nazionale di Geofisica e Vulcanologia, via della Faggiola, 56100, Pisa, Italy
Search for other works by this author on:
Roberto Santacroce
Roberto Santacroce
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 56, 56126 Pisa, Italy
Search for other works by this author on:
Published:
January 01, 2006

Volcaniclastic debris flows generated in drainage basins of the Apennine mountains of southern Campania in response to pyroclastic fall deposition from four Holocene eruptions of Somma-Vesuvius: Avellino (3.8 ka), A.D. 79, A.D. 472, and A.D. 1631. These syneruptive debris flows are lithologically homogeneous and contain more than 90% of material from the parental eruption. They differ from inter-eruptive debris flows recognized in the area, which contain mixed lithologies of juvenile material (i.e., volcanic material from different eruptions). Diffuse rill erosion generated fines-rich volcaniclastic flows (mudflows), whereas partial saturation of coarse ash and lapilli generated coarser-grained debris flows. Lithofacies analysis shows that debris flows predominate versus hyperconcentrated flows and normal stream-flow deposits. Debris-flow deposits are massive, matrix supported, and have a gravelly-sandy texture. Large blocks are scarce due to their absence in the pyroclastic source material. Lithofacies association indicates that volcaniclastic debris-flow deposits aggraded rapidly by superimposition of different surges that spontaneously developed within the flow. Bulk-flow density ranges from 1840 to 2260 kg/m3 (mean 2035 ± 207 kg/m3).

Geological data supported some considerations of hazard assessment in the study area and indicate that the syneruptive volcaniclastic flows stopped distally on active alluvial fans.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

GSA Special Papers

Neogene-Quaternary Continental Margin Volcanism: A perspective from Me´xico

Claus Siebe
Claus Siebe
Search for other works by this author on:
José Luis MacíasGerardo
José Luis MacíasGerardo
Search for other works by this author on:
J. Aguirre-Díaz
J. Aguirre-Díaz
Search for other works by this author on:
Geological Society of America
Volume
402
ISBN print:
9780813724027
Publication date:
January 01, 2006

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

Related Articles
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal