Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4562
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dc.contributor.authorallLokmer, I.; Seismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Irelanden
dc.contributor.authorallSaccorotti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italiaen
dc.contributor.authorallDi Lieto, B.; Dipartimento di Fisica “E. R. Caianiello”, Universita degli Studi di Salerno, Salerno, Italiaen
dc.contributor.authorallBean, C. J.; Seismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Irelanden
dc.date.accessioned2008-12-10T09:17:41Zen
dc.date.available2008-12-10T09:17:41Zen
dc.date.issued2008-02-01en
dc.identifier.urihttp://hdl.handle.net/2122/4562en
dc.description.abstractBetween December 2004 and August 2005, more than 50,000 long-period events (LP) accompanied by very-long period pulses (VLP) were recorded at Mt. Etna, encompassing the effusive eruption which started in September 2004. The observed activity can be explained by the injection of a gas slug formed within the magmatic column into an overlying cavity filled by either magmatic or hydrothermal fluids, thus triggering cavity resonance. Although a large number of LP events exhibit similar waveforms before the eruption, they change significantly during and after the eruption. We study the temporal evolution of the LP-VLP activity in terms of the source movement, change of the waveforms, temporal evolution of the dominant resonance frequencies and the source Q factor and changes in the polarization of the signal. The LP source locations before and after the eruption, respectively, do not move significantly, while a slight movement of the VLP source is found. The intensity of the LP events increases after the eruption as well as their dominant frequency and Q factor, while the polarization of the signals changes from predominantly transversal to pure radial motion. Although in previous studies a link between the observed LP activity and the eruption was not found, these observations suggest that such a link was established at the latter end of the eruptive sequence, most likely as a consequence of a reestablishment of the pressure balance in the plumbing system, after it was undermined due to the discharge of large amounts of resident magma during the eruption. Based on the polarization properties of the signal and geological setting of the area, a fluid-filled crack is proposed as the most likely source geometry. The spectral analysis based on the autoregressive-models (SOMPI) is applied to the signals in order to analyse the resonance frequencies and the source Q-factors. The results suggest water and basalt at low gas volume fraction as the most likely fluids involved in the source process. Using theoretical relations for the “slow waves” radiated from the fluid-filled crack, we also estimate the crack size for both fluids, respectively.en
dc.language.isoEnglishen
dc.publisher.nameElsevieren
dc.relation.ispartofEarth and Planetary Science Lettersen
dc.relation.ispartofseries1-2/266(2008)en
dc.relation.isversionofhttp://hdl.handle.net/2122/3061en
dc.subjectvolcano seismologyen
dc.subjectlong-period seismicityen
dc.subjectEtna volcanoen
dc.subjectvolcano monitoringen
dc.titleTemporal evolution of long-period seismicity at Etna Volcano, Italy, and its relationships with the 2004–2005 eruptionen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber205-220en
dc.identifier.URLhttp://scienceserver.cilea.it/cgi-bin/sciserv.pl?collection=journals&journal=0012821x&issue=v266i1-2&article=205_teolsairwt2e&form=pdf&file=file.pdfen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismologyen
dc.identifier.doi10.1016/j.epsl.2007.11.017en
dc.description.obiettivoSpecifico1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attiveen
dc.description.obiettivoSpecifico3.6. Fisica del vulcanismoen
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorLokmer, I.en
dc.contributor.authorSaccorotti, G.en
dc.contributor.authorDi Lieto, B.en
dc.contributor.authorBean, C. J.en
dc.contributor.departmentSeismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Irelanden
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italiaen
dc.contributor.departmentDipartimento di Fisica “E. R. Caianiello”, Universita degli Studi di Salerno, Salerno, Italiaen
dc.contributor.departmentSeismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Irelanden
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptSchool of Geological Sciences, University College Dublin, Dublin, Ireland-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia-
crisitem.author.deptSeismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Ireland-
crisitem.author.orcid0000-0003-2915-1446-
crisitem.author.orcid0000-0001-8093-3051-
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-
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