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Mantle beneath the Gibraltar Arc from receiver functions

2015-02Journal article Restricted access
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dc.contributor.authorIolanda Morais
dc.contributor.authorVinnik, Lev
dc.contributor.authorSilveira, Graça
dc.contributor.authorKiselev, Sergei
dc.contributor.authorMatias, Luís
dc.date.accessioned2016-04-13T14:22:49Z
dc.date.available2016-04-13T14:22:49Z
dc.date.issued2015-02
dc.description.abstractP and S receiver functions (PRF and SRF) from 19 seismograph stations in the Gibraltar Arc and the Iberian Massif reveal new details of the regional deep structure. Within the high-velocity mantle body below southern Spain the 660-km discontinuity is depressed by at least 20 km. The Ps phase from the 410-km discontinuity is missing at most stations in the Gibraltar Arc. A thin (similar to 50 km) low-S-velocity layer atop the 410-km discontinuity is found under the Atlantic margin. At most stations the S410p phase in the SRFs arrives 1.0-2.5 s earlier than predicted by IASP91 model, but, for the propagation paths through the upper mantle below southern Spain, the arrivals of S410p are delayed by up to +1.5 s. The early arrivals can be explained by elevated Vp/Vs ratio in the upper mantle or by a depressed 410-km discontinuity. The positive residuals are indicative of a low (similar to 1.7 versus similar to 1.8 in IASP91) Vp/Vs ratio. Previously, the low ratio was found in depleted lithosphere of Precambrian cratons. From simultaneous inversion of the PRFs and SRFs we recognize two types of the mantle: 'continental' and 'oceanic'. In the 'continental' upper mantle the S-wave velocity in the high-velocity lid is 4.4-4.5 km s(-1), the S-velocity contrast between the lid and the underlying mantle is often near the limit of resolution (0.1 km s(-1)), and the bottom of the lid is at a depth reaching 90 100 km. In the 'oceanic' domain, the S-wave velocities in the lid and the underlying mantle are typically 4.2-4.3 and similar to 4.0 km s(-1), respectively. The bottom of the lid is at a shallow depth (around 50 km), and at some locations the lid is replaced by a low S-wave velocity layer. The narrow S-N-oriented band of earthquakes at depths from 70 to 120 km in the Alboran Sea is in the 'continental' domain, near the boundary between the 'continental' and 'oceanic' domains, and the intermediate seismicity may be an effect of ongoing destruction of the continental lithosphere.pt_PT
dc.identifier.citationMORAIS, Iolanda; [et al] - Mantle beneath the Gibraltar Arc from receiver functions. Geophysical Journal International. ISSN 0956-540X. Vol. 200, N.º 2 (2015), pp. 1153-1169pt_PT
dc.identifier.doi10.1093/gji/ggu456pt_PT
dc.identifier.issn0956-540X
dc.identifier.issn1365-246X
dc.identifier.urihttp://hdl.handle.net/10400.21/5964
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherOxford University Presspt_PT
dc.relation.publisherversionhttp://gji.oxfordjournals.org/content/200/2/1155.fullpt_PT
dc.subjectMantle processespt_PT
dc.subjectBody wavespt_PT
dc.subjectDynamics of lithosphere and mantlept_PT
dc.titleMantle beneath the Gibraltar Arc from receiver functionspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1169pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage1153pt_PT
oaire.citation.titleGeophysical Journal Internationalpt_PT
oaire.citation.volume200pt_PT
person.familyNameMorais
person.familyNameVinnik
person.familyNameSilveira
person.givenNameIolanda
person.givenNameLev
person.givenNameGraça
person.identifier91922
person.identifier.ciencia-id981A-43E4-A5B2
person.identifier.ciencia-id1116-1080-16F3
person.identifier.orcid0000-0002-2633-6202
person.identifier.orcid0000-0002-1135-6200
person.identifier.orcid0000-0002-2110-2554
person.identifier.ridF-6438-2013
person.identifier.ridA-3081-2009
person.identifier.scopus-author-id6603452215
person.identifier.scopus-author-id6602698071
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication1b04043e-28e4-4458-9282-d888d3b3d7ae
relation.isAuthorOfPublication274ab7b0-7205-4772-a163-e9d446f95ff5
relation.isAuthorOfPublicationd4ff725a-b30b-4acb-906d-b60530a4994f
relation.isAuthorOfPublication.latestForDiscovery1b04043e-28e4-4458-9282-d888d3b3d7ae

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