Source mechanism of long period events recorded by a high density seismic network during the 2008 eruption on Mount Etna

DC FieldValueLanguage
dc.contributor.authorDe Barros, Louis
dc.contributor.authorLokmer, Ivan
dc.contributor.authorBean, Christopher J.
dc.contributor.authorO'Brien, G. S.
dc.contributor.authorZuccarello, Luciano
dc.contributor.authoret al.
dc.date.accessioned2014-02-28T09:46:25Z
dc.date.available2014-02-28T09:46:25Z
dc.date.copyright2011, American Geophysical Unionen
dc.date.issued2011-01
dc.identifier.citationJournal of Geophysical Research-Solid Earthen
dc.identifier.urihttp://hdl.handle.net/10197/5440
dc.description.abstract129 Long Period (LP) events, divided into two families of similar events, were recorded by the 50 stations deployed on Mount Etna in the second half of June 2008. During this period lava was flowing from a lateral fracture after a summit strombolian eruption. In order to understand the mechanisms of these events, we perform moment tensor inversions. Inversions are initially kept unconstrained to estimate the most likely mechanism. Numerical tests show that unconstrained inversion leads to reliable moment tensor solutions because of the close proximity of numerous stations to the source positions. However, single forces cannot be accurately determined as they are very sensitive to uncertainties in the velocity model. Constrained inversions for a crack, a pipe or an explosion then allow us to accurately determine the structural orientations of the source mechanisms. Both numerical tests and LP event inversions emphasise the importance of using stations located as close as possible to the source. Inversions for both families show mechanisms with a strong volumetric component. These events are most likely generated by cracks striking SW-NE for both families and dipping 70 degrees SE (Family 1) and 50 degrees NW (Family 2). For Family 1 events, the crack geometry is nearly orthogonal to the dike-like structure along which events are located, while for Family 2 the location gave two pipe-like bodies which belong to the same plane as the crack mechanism. The orientations of the cracks are consistent with local tectonics, which shows a SW-NE weakness direction. The LP events appear to be a response to the lava fountain occurring on the 10th of May, 2008 as opposed to the flank lava flow.en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.subjectLong-period events
dc.subjectStombolian eruption
dc.subjectMoment tensor
dc.subjectEvent inversions
dc.subjectCracks
dc.subjectLava
dc.subjectTectonics
dc.titleSource mechanism of long period events recorded by a high density seismic network during the 2008 eruption on Mount Etnaen
dc.typeJournal Articleen
dc.internal.authorcontactotherchris.bean@ucd.ie
dc.internal.availabilityFull text availableen
dc.internal.webversionswww.agu.org/journals/jb/papersinpress.shtml#id2010JB007629-
dc.statusPeer revieweden
dc.identifier.volume116en
dc.identifier.issueB1en
dc.identifier.startpageB01034en
dc.identifier.doi10.1029/2010JB007629-
dc.neeo.contributorDe Barros|Louis|aut|-
dc.neeo.contributorLokmer|Ivan|aut|-
dc.neeo.contributorBean|Christopher J.|aut|-
dc.neeo.contributorO'Brien|G. S.|aut|-
dc.neeo.contributorZuccarello|Luciano|aut|-
dc.neeo.contributoret al.||aut|-
dc.description.adminAD 25/02/2014en
dc.internal.rmsid185335644
dc.date.updated2014-02-05T13:19:33Z
dc.rights.licensehttps://creativecommons.org/licenses/by-nc-nd/3.0/ie/en
item.grantfulltextopen-
item.fulltextWith Fulltext-
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