Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/463
DC Field | Value | Language |
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dc.contributor.authorall | Trasatti, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia | en |
dc.contributor.authorall | Giunchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia | en |
dc.contributor.authorall | Bonafede, M.; Università degli Studi, Bologna | en |
dc.date.accessioned | 2005-10-10T09:16:55Z | en |
dc.date.available | 2005-10-10T09:16:55Z | en |
dc.date.issued | 2005 | en |
dc.identifier.uri | http://hdl.handle.net/2122/463 | en |
dc.description.abstract | The 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.sponsorship | INGV-Gruppo Nazionale per la Vulcanologia; Ministero dell'Istruzione Università e Ricerca- FIRB Project | en |
dc.format.extent | 330510 bytes | en |
dc.format.mimetype | application/pdf | en |
dc.language.iso | English | en |
dc.publisher.name | Elsevier | en |
dc.relation.ispartof | Journal of Volcanology and Geothermal Research | en |
dc.relation.ispartofseries | 144 (2005) | en |
dc.subject | finite element modelling | en |
dc.subject | Campi Flegrei | en |
dc.subject | surface deformation | en |
dc.subject | plasticity | en |
dc.subject | rheological layering | en |
dc.subject | overpressure source | en |
dc.title | Structural and rheological constraints on source depth and overpressure estimates at the Campi Flegrei caldera, Italy | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 14 | en |
dc.identifier.URL | http://www.elsevier.com/wps/find/journaldescription.cws_home/503346/description#description | en |
dc.subject.INGV | 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations | en |
dc.description.fulltext | reserved | en |
dc.contributor.author | Trasatti, E. | en |
dc.contributor.author | Giunchi, C. | en |
dc.contributor.author | Bonafede, M. | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia | en |
dc.contributor.department | Università degli Studi, Bologna | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italia | - |
crisitem.author.dept | University of Bologna | - |
crisitem.author.orcid | 0000-0002-2983-045X | - |
crisitem.author.orcid | 0000-0002-0174-324X | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
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