Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7417
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dc.contributor.authorallCioni, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italiaen
dc.contributor.authorallBertagnini, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italiaen
dc.contributor.authorallAndronico, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italiaen
dc.contributor.authorallCole, P. D.; Montserrat Volcano Observatory, Flemmings, Montserrat, West Indies; Seismic Research Centre, Trinidad and Tobago, West Indiesen
dc.contributor.authorallMundula, F.; Dip.to di Scienze della Terra, Università di Cagliari, Via Trentino 51, 09127 Cagliari, Italyen
dc.date.accessioned2012-01-19T10:23:41Zen
dc.date.available2012-01-19T10:23:41Zen
dc.date.issued2011-09en
dc.identifier.urihttp://hdl.handle.net/2122/7417en
dc.description.abstractWe describe the products of the hitherto poorly known 512 AD eruption at Vesuvius, Italy. The deposit records a complex sequence of eruptive events, and it has been subdivided into eight main units, composed of stratified scoria lapilli or thin subordinate ash-rich layers. All the units formed by deposition from tephra fallout, pyroclastic density currents of limited extent being restricted to the initial stages of the eruption (U2). The main part of the deposit (U3 and U5) is characterized by a striking grain size alternation of fine to coarse lapilli, similar to that often described for mid-intensity, explosive eruptions. The erupted products have a phonotephritic composition, with progressively less evolved composition from the base to the top of the stratigraphic sequence. Based on different dispersal, sedimentological and textural features of the products, we identify five phases related to different eruptive styles: opening phase (U1, U2), subplinian phase (U3 to U5), pulsatory phreatomagmatic phase (U6), violent strombolian phase (U7) and final ash-dominated phase (U8). A DRE volume of 0.025 km3 has been calculated for the total fallout deposit. Most of the magma was erupted during the subplinian phase; lithic dispersal data indicate peak column heights of between 10 and 15 km, which correspond to a mass discharge rate (MDR) of 5×106 kg s1. The lower intensity, violent strombolian phase coincided with the eruption of the least evolved magma; a peak column height of 69 km, corresponding to an MDR of 1×106 kg s1, is estimated from field data. Phreatomagmatic activity played a minor role in the eruption, only contributing to the ash-rich deposits of U1, U4, U6 and U8. The two most striking features of the 512 AD eruption are the recurrent shifting of the eruption style and the pulsatory nature of the subplinian phase. Basing on a large set of observational data, we propose a model to explain this complex dynamics, also observed in other eruptions of similar scale from Vesuvius and elsewhere. The inbalance between the rates of magma supply and magma eruption may have caused the frequent changes in the eruptive style. Conversely, the high frequency oscillations of magma discharge recorded by the deposits of the subplinian phase were possibly related to cyclic instabilities in the permeability of the low viscosity magma column, which modulated magma fragmentation and discharge.en
dc.language.isoEnglishen
dc.publisher.nameSpringer-Verlag, Berlin/Heidelbergen
dc.relation.ispartofBulletin of Volcanologyen
dc.relation.ispartofseries7/73(2011)en
dc.subjectSubplinianen
dc.subjectVesuviusen
dc.subjectMagma fragmentationen
dc.subjectPhreatomagmatismen
dc.subjectEruption dynamicsen
dc.titleThe 512 AD eruption of Vesuvius: complex dynamics of a small scale subplinian eventen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber789-810en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.10. Stratigraphyen
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocksen
dc.identifier.doi10.1007/s00445-011-0454-3en
dc.description.obiettivoSpecifico3.5. Geologia e storia dei vulcani ed evoluzione dei magmien
dc.description.obiettivoSpecifico4.3. TTC - Scenari di pericolosità vulcanicaen
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorCioni, R.en
dc.contributor.authorBertagnini, A.en
dc.contributor.authorAndronico, D.en
dc.contributor.authorCole, P. D.en
dc.contributor.authorMundula, F.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italiaen
dc.contributor.departmentMontserrat Volcano Observatory, Flemmings, Montserrat, West Indies; Seismic Research Centre, Trinidad and Tobago, West Indiesen
dc.contributor.departmentDip.to di Scienze della Terra, Università di Cagliari, Via Trentino 51, 09127 Cagliari, Italyen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia-
crisitem.author.deptDepartment of Geography, Environment and Disaster Management, University of Coventry, Coventry, UK-
crisitem.author.deptDip.to di Scienze della Terra, Università di Cagliari, Via Trentino 51, 09127 Cagliari, Italy-
crisitem.author.orcid0000-0002-2526-9095-
crisitem.author.orcid0000-0003-4075-2242-
crisitem.author.orcid0000-0002-8333-1547-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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