Investigating the source characteristics of long-period (LP) seismic events recorded on Piton de la Fournaise volcano, La Réunion

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dc.contributor.authorZecevic, Megan-
dc.contributor.authorDe Barros, Louis-
dc.contributor.authorBean, Christopher J.-
dc.contributor.authorO'Brien, G. S.-
dc.contributor.authorBrenguier, Florent- Elsevieren
dc.identifier.citationJournal of Volcanology and Geothermal Researchen
dc.description.abstractMagmatic and hydrothermal processes play a significant role in generating seismicity at active volcanoes. These signals can be recorded at the surface and can be used to obtain an insight into the volcano's internal dynamics. Long period (LP) events are of particular interest as they often accompany or precede volcanic eruptions, but they are still not well understood. Piton de la Fournaise volcano, La Réunion Island, is one of the most active volcanoes in the world however LP events are rarely recorded there. A seismic network of 20 broadband seismometers has been operational on Piton de la Fournaise volcano since November 2009. Between November 2009 and January 2011 the volcano erupted five times, but only 15 LP events were recorded. Three of these eruptions were preceded by LP events, and several LP events were recorded during an intrusive phase. A family of three repeating LP events exists within the dataset. In order to characterize these events we locate and perform moment tensor inversion on the LP family. The LP events are located within the summit crater at shallow depths (< 200 m below the surface). Inversions show that the source mechanism is best represented by a tensile crack with horizontal crack geometry. We also investigate the relationship between LP occurrence and eruptive characteristics (size of the eruption, deformation of the edifice, etc.), and we find that the events exist only during flank eruptions and can be generated by the activity of the hydrothermal system and/or by the deformation inside the crater.en
dc.rightsThis is the author’s version of a work that was accepted for publication in Journal of Volcanology and Geothermal Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Volcanology and Geothermal Research (VOL 258, ISSUE#, (2013)) DOI:10.1016/j.jvolgeores.2013.04.009en
dc.subjectLong-period eventsen
dc.subjectPiton de la Fournaise volcanoen
dc.subjectMoment tensor inversionen
dc.subjectVolcano seismologyen
dc.titleInvestigating the source characteristics of long-period (LP) seismic events recorded on Piton de la Fournaise volcano, La Réunionen
dc.typeJournal Articleen
dc.internal.availabilityFull text availableen
dc.statusPeer revieweden
dc.identifier.issue15 May 2013en
dc.neeo.contributorDe Barros|Louis|aut|-
dc.neeo.contributorBean|Christopher J.|aut|-
dc.neeo.contributorO'Brien|G. S.|aut|-
dc.description.othersponsorshipMarie Curie Actionsen
dc.description.othersponsorshipITN QUESTen
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