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Very- and ultra-long-period seismic signals prior to and during caldera formation on La Reunion Island

Fontaine, Fabrice R.; Roult, G.; Hejrani, Babak; Michon, L.; Ferrazzini, V.; Barruol, G.; Tkalčić, Hrvoje; Di Muro, A.; Peltier, A.; Reymond, D.; Staudacher, T.; Massin, F.

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Early detection of the onset of a caldera collapse can provide crucial information to understand their formation and thus to minimize risks for the nearby population and visitors. Here, we analyse the 2007 caldera collapse of Piton de la Fournaise on La Réunion Island recorded by a broadband seismic station. We show that this instrument recorded ultra-long period (ULP) signals with frequencies in the range (0.003–0.01 Hz) accompanied by very-long period (VLP) signals (between 0.02 and 0.50 Hz)...[Show more]

dc.contributor.authorFontaine, Fabrice R.
dc.contributor.authorRoult, G.
dc.contributor.authorHejrani, Babak
dc.contributor.authorMichon, L.
dc.contributor.authorFerrazzini, V.
dc.contributor.authorBarruol, G.
dc.contributor.authorTkalčić, Hrvoje
dc.contributor.authorDi Muro, A.
dc.contributor.authorPeltier, A.
dc.contributor.authorReymond, D.
dc.contributor.authorStaudacher, T.
dc.contributor.authorMassin, F.
dc.date.accessioned2019-12-03T03:53:10Z
dc.date.available2019-12-03T03:53:10Z
dc.identifier.issn2045-2322
dc.identifier.urihttp://hdl.handle.net/1885/187229
dc.description.abstractEarly detection of the onset of a caldera collapse can provide crucial information to understand their formation and thus to minimize risks for the nearby population and visitors. Here, we analyse the 2007 caldera collapse of Piton de la Fournaise on La Réunion Island recorded by a broadband seismic station. We show that this instrument recorded ultra-long period (ULP) signals with frequencies in the range (0.003–0.01 Hz) accompanied by very-long period (VLP) signals (between 0.02 and 0.50 Hz) prior to and during the caldera formation suggesting it is possible to detect the beginning of the collapse at depth and anticipate its surface formation. Interestingly, VLP wave packets with a similar duration of 20 s are identified prior to and during the caldera formation. We propose that these events could result from repeating piston-like successive collapses occurring through a ring-fault structure surrounding a magma reservoir from the following arguments: the source mechanism from the main collapse, the observations of slow source processes as well as observations from the field and the characteristic ring-fault seismicity.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherNature Publishing Group
dc.rights© 2019 The Author(s)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceScientific Reports
dc.titleVery- and ultra-long-period seismic signals prior to and during caldera formation on La Reunion Island
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume9
dcterms.dateAccepted2019-05-17
dc.date.issued2019-05-30
local.identifier.absfor040400 - GEOPHYSICS
local.identifier.ariespublicationu3102795xPUB1943
local.publisher.urlhttps://www.nature.com
local.type.statusPublished Version
local.contributor.affiliationFontaine, Fabrice R., Universite de La Reunion
local.contributor.affiliationRoult, G., Université de Paris
local.contributor.affiliationHejrani, Babak, College of Science, ANU
local.contributor.affiliationMichon, L., Université de Paris
local.contributor.affiliationFerrazzini, V., Université de Paris
local.contributor.affiliationBarruol, G., Université de La Réunion
local.contributor.affiliationTkalcic, Hrvoje, College of Science, ANU
local.contributor.affiliationDi Muro, A., Université de Paris
local.contributor.affiliationPeltier, A., Université de Paris
local.contributor.affiliationReymond, D., laboratoire de geophysique
local.contributor.affiliationStaudacher, T., Université de Paris
local.contributor.affiliationMassin, F., ETH Zurich
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage15
local.identifier.doi10.1038/s41598-019-44439-1
dc.date.updated2019-06-30T08:23:58Z
local.identifier.thomsonID4.69418E+11
dcterms.accessRightsOpen Access
dc.provenanceThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
dc.rights.licenseCreative Commons Attribution 4.0 International License
CollectionsANU Research Publications

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