Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2069
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dc.contributor.authorallPfeiffer, T.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.authorallCosta, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.date.accessioned2007-04-02T14:41:07Zen
dc.date.available2007-04-02T14:41:07Zen
dc.date.issued2004-11-10en
dc.identifier.urihttp://hdl.handle.net/2122/2069en
dc.description.abstractA simple semi-analytical model presented in Pfeiffer et al. (in press) (“Hazmap”-modified version) was applied to reconstruct the tephra deposit of a Plinian or sub-Plinian phase (called Astroni 6, after Isaia et al., 2004) of an eruption of the Astroni volcano (ca. 4100-3800 BP) within the Campi Flegrei volcanic area in Italy. In this model, the eruption column is assumed to act as a line source in order to neglect complex near/vent interactions. Therefore, the validity of the model is limited to the medium and far areas from the vent (beyond 10-20km), where the assumption of a line source can be justified. The distribution of the particles in the atmosphere is assumed to be only controlled by gravity, wind and eddy diffusion. The model accounts for two different types of particles (juvenile pumice and unspecified dense particles) within a used-defined range of granulometric classes. The numerically calculated deposit was confronted with the observed deposit. Applying a least/squares method it was tried to optimize input variables such as distribution of particles and mass within the eruption column, wind and diffusion parameters by fitting the computed deposit with the observed one. A good correlation between the numerically calculated and the measured deposit could be achieved, although the quality of the input data is poor because of the lack of a sufficient number of distal sample points. Therefore, best fitting input parameters could not be well constrained and the presented results must be seen as a fairly rough estimate on eruption conditions only. IN particular, the erupted mass and eruption column height predicted by the model are considerably smaller than those presented by other authors (Isaia et al., 2004). However, the discrepancy is large enough to raise the question about the precision of other estimates as well.en
dc.description.sponsorshipINGVen
dc.format.extent356217 bytesen
dc.format.mimetypeapplication/pdfen
dc.language.isoEnglishen
dc.relation.ispartofseriesOV Prot. N. 4440en
dc.subjectCampi Flegrei eruptionen
dc.subjectNumerical reconstructionen
dc.titleReconstruction and analysis of a sub-Plinian fall deposit from the Astroni volcano (ca. 4100-3800 BP) in the Campi Flegrei area, Italyen
dc.typereporten
dc.description.statusUnpublisheden
dc.type.QualityControlUnreferreden
dc.subject.INGV05. General::05.02. Data dissemination::05.02.03. Volcanic eruptionsen
dc.relation.referencesArmienti, P. et al. (1988) A Numerical Model for Simulation of Tephra Transport and Deposition: Application to May 18, 1980, Mount St. Helens Eruption - Journal of Geophysical Research 93, p.6463-6476. Cornell, W., Carey, S., Sigurdsson, H. (1983) Computer simulation and transport of the Campanian Y-5 ash, J. of Volcanology and Geothermal Res., 17, 89-109. Isaia, R., D’Antonio, M., Dell’Erba, F., Di Vito, M., Orsi, G. (2004) The Astroni volcano: the only example of closely spaced eruptions in the same vent area during the recent history of the Campi Flegrei caldera (Italy), Journal of Volcanology and Geothermal Research, 2035, p. 1-22. Macedonio, G. et al. (1988) A Numerical Simulation of the Plinian Fall Phase of 79 A.D. Eruption of Vesuvius - Journal of Geophysical Research, 93, p. 817-827. Macedonio, G. et al. (2003) Hazmap - A computer program for the simulation of ash dispersion from discrete point sources, Osservatorio Vesuviano, Naples. Pfeiffer, T. (2003) Numeric reconstruction of tephra-fall deposits from the 18 august and 16/17 September 1992 eruptions of Crater Peak, Mt. Spurr volcano, Alaska, in: Two catastrophic volcanic eruptions in the Mediterranean – Santorini 1645 B.C. and Vesuvius 79 A.D., Ph.D. thesis, Dep. of Earth Sciences, University of Aarhus, Denmark, 141-183. Pfeiffer, T. , Costa A., Macedonio, G. (in press) A model for the numerical reconstruction of tephra-fall deposits, Journal .of Volcanology and Geothermal Research. Suzuki, T. (1983) A theoretical model for dispersion of tephra. In: Volcanism: Physics and Tectonics, edited by D. Shimozuru and I. Yokoyama, pp. 95-113, Arc, Tokyo.en
dc.description.fulltextopenen
dc.contributor.authorPfeiffer, T.en
dc.contributor.authorCosta, A.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
item.openairetypereport-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_93fc-
item.fulltextWith Fulltext-
crisitem.author.deptUniversity of Aarhus, Denmark, Department of Earth Sciences-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia-
crisitem.author.orcid0000-0002-4987-6471-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent05. General-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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