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3D-ambient noise surface wave tomography of Fogo volcano, Cape Verde

dc.contributor.authorCarvalho, J.
dc.contributor.authorSilveira, Graça
dc.contributor.authorDumont, Stéphanie
dc.contributor.authorRamalho, Ricardo Dos Santos
dc.date.accessioned2023-03-22T16:21:24Z
dc.date.available2024-10-26T00:30:32Z
dc.date.issued2022
dc.description.abstractFogo volcano belongs to the Cape Verde Archipelago, and it is one of the most active volcanoes in the Atlantic Ocean, which most recent eruption occurred from November 2014 to February 2015. We analyzed ambient seismic noise recordings of three different networks deployed in the island, totalizing 14 seismic stations, to derive a crustal 3D shear-wave crustal velocity model of the volcano. Through the phase cross-correlation technique followed by a time-domain phase weighted stack, we were able to measure Rayleigh wave group-velocity dispersion measurements in the period range from 1.0 to 10 s. These dispersion measurements were used to invert for 2D group velocity maps at selected periods, and then inverted to produce a 3D shear-wave velocity model of the island. The tomographic model shows three velocity domains. First, an asymmetric upper layer, above 5–6 km of depth, with lower velocities concentrated in the northeastern sector of the island and a clear higher-velocity horizontal body at 3–4 km of depth in the southwestern sector of the island; the spatial correlation between these two velocity zones and the Galinheiros normal fault suggests a genetic link between the high velocities and long-term surface deformation, which we related to sill intrusions between 3 and 4.5 km depth, beneath the southwestern sector of the island. Second, a marked higher-velocity horizontal layer in between 5 and 6 km and 8–9 km, interpreted as the seismic expression of pervasive sill and laccolith intrusions, now cooled, beneath the volcanic edifice and within the underlying oceanic crust. Third, a lower velocity layer below 8–9 km of depth, more pronounced beneath the northeastern sector, which could be explained by a hotter and possibly melt-rich zone beneath the volcano or a significantly altered/serpentinized crust. Finally, our study also confirms that Fogo lacks any sizable magma chambers (ancient or recent) within the volcanic edifice, in agreement with other geophysical and petrological studies. These observations demonstrate that 3D-ambient noise Rayleigh wave tomography is a powerful tool to image the crustal and upper mantle structure beneath volcanic islands, as shown here for Fogo volcano.pt_PT
dc.description.versioninfo:eu-repo/semantics/acceptedVersionpt_PT
dc.identifier.doi10.1016/j.jvolgeores.2022.107702pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/56768
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationPTDC/GEOGEO/ 1123/2014pt_PT
dc.relationSeIsmic and Geochemical constraints on the Madeira HoTspot system
dc.relationUIDB/50019/2020pt_PT
dc.relationPTDC/CTAGEF/30264/2017pt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0377027322002335pt_PT
dc.subjectCape Verdept_PT
dc.subjectFogo volcanopt_PT
dc.subjectAmbient seismic noisept_PT
dc.subjectVolcano tomographypt_PT
dc.subjectSill intrusionspt_PT
dc.title3D-ambient noise surface wave tomography of Fogo volcano, Cape Verdept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleSeIsmic and Geochemical constraints on the Madeira HoTspot system
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTA-GEF%2F30264%2F2017/PT
oaire.citation.startPage107702pt_PT
oaire.citation.titleJournal of Volcanology and Geothermal Researchpt_PT
oaire.citation.volume432pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameSantos de Carvalho
person.familyNameMedeiros da Silveira
person.familyNameDumont
person.familyNameRamalho
person.givenNameJoana Filipa
person.givenNameMaria da Graça
person.givenNameStéphanie
person.givenNameRicardo
person.identifierY-4951-2018
person.identifierA-3081-2009
person.identifierFC8iALAAAAAJ
person.identifier393989
person.identifier.ciencia-id2E17-6C99-4CBB
person.identifier.ciencia-id1116-1080-16F3
person.identifier.ciencia-id2217-E8C9-E98D
person.identifier.ciencia-id0217-6E26-E36B
person.identifier.orcid0000-0003-1077-8994
person.identifier.orcid0000-0002-2110-2554
person.identifier.orcid0000-0002-4779-7788
person.identifier.orcid0000-0002-2338-5535
person.identifier.ridI-6031-2012
person.identifier.scopus-author-id6602698071
person.identifier.scopus-author-id36011115200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.embargofctJournal policypt_PT
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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