Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/463
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dc.contributor.authorallTrasatti, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallGiunchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallBonafede, M.; Università degli Studi, Bolognaen
dc.date.accessioned2005-10-10T09:16:55Zen
dc.date.available2005-10-10T09:16:55Zen
dc.date.issued2005en
dc.identifier.urihttp://hdl.handle.net/2122/463en
dc.description.abstractThe 1982-84 unrest episode at Campi Flegrei (CF) caldera, Italy, was characterized by huge deformation (more than 1.5 m uplift) concentrated inside the caldera. According to point source isotropic models in homogeneous elastic and visco-elastic half-spaces, the source depth is very shallow (about 3 km). If the source radius is about 1 km this implies that magma is at a depth of 2 km depth. However, several independent observations show that the top of the magma chamber at CF must be deeper than 4 km. This paper investigates how the inferred source depth increases when rigidity heterogeneities (obtained through seismic tomography at CF) are considered and when the long-term deformation takes place under drained conditions. Finite element models indicate that overpressure needed at the source to reproduce the 1.5 m maximum uplift is however beyond typical rock strength values. This evidence, together with the high thermal anomalies, the presence of fluids and the low cohesion of tuffs filling the caldera, suggests the use of elastoplastic constitutive laws. For elastoplastic behavior, the same deformation is obtained using a deeper source (with center at 5 km depth) and a lower overpressure (than required by elastic models). The plastic deformation concentrates both at the source boundaries and above the source, where seismic activity has been recorded. These results indicate that the rheological properties of the shallow crust of CF have important implications for hazard estimate during unrest episodes.en
dc.description.sponsorshipINGV-Gruppo Nazionale per la Vulcanologia; Ministero dell'Istruzione Università e Ricerca- FIRB Projecten
dc.format.extent330510 bytesen
dc.format.mimetypeapplication/pdfen
dc.language.isoEnglishen
dc.publisher.nameElsevieren
dc.relation.ispartofJournal of Volcanology and Geothermal Researchen
dc.relation.ispartofseries144 (2005)en
dc.subjectfinite element modellingen
dc.subjectCampi Flegreien
dc.subjectsurface deformationen
dc.subjectplasticityen
dc.subjectrheological layeringen
dc.subjectoverpressure sourceen
dc.titleStructural and rheological constraints on source depth and overpressure estimates at the Campi Flegrei caldera, Italyen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber14en
dc.identifier.URLhttp://www.elsevier.com/wps/find/journaldescription.cws_home/503346/description#descriptionen
dc.subject.INGV04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformationsen
dc.description.fulltextreserveden
dc.contributor.authorTrasatti, E.en
dc.contributor.authorGiunchi, C.en
dc.contributor.authorBonafede, M.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.departmentUniversità degli Studi, Bolognaen
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 ONT, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italia-
crisitem.author.deptUniversity of Bologna-
crisitem.author.orcid0000-0002-2983-045X-
crisitem.author.orcid0000-0002-0174-324X-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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