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Intraplate seismicity across the Cape Verde swell: a contribution from a temporary seismic network

2014-12Journal article Restricted access
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dc.contributor.authorVales, Dina
dc.contributor.authorDias, Nuno
dc.contributor.authorRio, Inês
dc.contributor.authorMatias, Luís
dc.contributor.authorSilveira, Graça
dc.contributor.authorMadeira, JFA
dc.contributor.authorWebber, Michael
dc.contributor.authorCarrilho, Fernando
dc.contributor.authorHaberland, Christian
dc.date.accessioned2015-08-25T10:22:55Z
dc.date.available2015-08-25T10:22:55Z
dc.date.issued2014-12
dc.description.abstractWe present an analysis and characterization of the regional seismicity recorded by a temporary broadband seismic network deployed in the Cape Verde archipelago between November 2007 and September 2008. The detection of earthquakes was based on spectrograms, allowing the discrimination from low-frequency volcanic signals, resulting in 358 events of which 265 were located, the magnitudes usually being smaller than 3. For the location, a new 1-D P-velocity model was derived for the region showing a crust consistent with an oceanic crustal structure. The seismicity is located mostly offshore the westernmost and geologically youngest areas of the archipelago, near the islands of Santo Antao and Sao Vicente in the NW and Brava and Fogo in the SW. The SW cluster has a lower occurrence rate and corresponds to seismicity concentrated mainly along an alignment between Brava and the Cadamosto seamount presenting normal faulting mechanisms. The existence of the NW cluster, located offshore SW of Santo Antao, was so far unknown and concentrates around a recently recognized submarine cone field; this cluster presents focal depths extending from the crust to the upper mantle and suggests volcanic unrest No evident temporal behaviour could be perceived, although the events tend to occur in bursts of activity lasting a few days. In this recording period, no significant activity was detected at Fogo volcano, the most active volcanic edifice in Cape Verde. The seismicity characteristics point mainly to a volcanic origin. The correlation of the recorded seismicity with active volcanic structures agrees with the tendency for a westward migration of volcanic activity in the archipelago as indicated by the geologic record. (C) 2014 Elsevier B.V. All rights reserved.por
dc.identifier.citationVALES, Dina; [et al] – Intraplate seismicity across the Cape Verde swell: A contribution from a temporary seismic network. Tectonophysics. ISSN: 0040-1951. Vol. 636 (2014), pp. 325-337por
dc.identifier.urihttp://hdl.handle.net/10400.21/4980
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectIntraplate Seismicitypor
dc.subjectClusteringpor
dc.subjectLocal Magnitude Scalepor
dc.subjectActive Volcanismpor
dc.subjectCape Verdepor
dc.subjectAtlantic Oceanpor
dc.titleIntraplate seismicity across the Cape Verde swell: a contribution from a temporary seismic networkpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceAmsterdampor
oaire.citation.endPage337por
oaire.citation.startPage325por
oaire.citation.titleTectonophysicspor
oaire.citation.volume636por
person.familyNameDias
person.familyNameSilveira
person.familyNameMadeira
person.familyNameCarrilho
person.familyNameHaberland
person.givenNameNuno
person.givenNameGraça
person.givenNameJose Firmino Aguilar
person.givenNameFernando
person.givenNameChristian
person.identifier1348964
person.identifier91922
person.identifier.ciencia-idDB10-5086-2205
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person.identifier.orcid0000-0001-7672-4476
person.identifier.orcid0000-0002-2110-2554
person.identifier.orcid0000-0001-9523-3808
person.identifier.orcid0000-0003-3287-6800
person.identifier.orcid0000-0002-2981-7087
person.identifier.ridB-2778-2008
person.identifier.ridA-3081-2009
person.identifier.ridN-6918-2016
person.identifier.scopus-author-id56640885300
person.identifier.scopus-author-id6602698071
person.identifier.scopus-author-id7003405549
person.identifier.scopus-author-id7006364430
rcaap.rightsclosedAccesspor
rcaap.typearticlepor
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