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Deep structure of crust and mantle beneath Iberia and Western Mediterranean from P and S Receiver functions and SKS Waveforms

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dc.contributor.authorMorais, I.
dc.contributor.authorVinnik, Lev
dc.contributor.authorSilveira, Graça
dc.contributor.authorMatias, L.
dc.contributor.authorKieselev, S.
dc.date.accessioned2015-09-10T11:05:53Z
dc.date.available2015-09-10T11:05:53Z
dc.date.issued2012
dc.description.abstractWe have conducted a P and S receiver functions [PRFs and SRFs] analysis for 19 seismic stations on the Iberia and western Mediterranean. In the transition zone [TZ] the PRFs analysis reveals a band [from Gibraltar to Balearic] increased by 10-20 km relative to the standard 250 km. The TZ thickness variations are strongly correlated with the P660s times in PRFs. We interpret the variable depth of the 660-km discontinuity as an effect of subduction. Over the anomalous TZ we found a reduced velocity zone in the upper mantle. Joint inversion of PRFs and SRFs reveals a subcrustal high S velocity lid and an underlying LVZ. A reduction of the S velocity in the LVZ is less than 10%. The Gutenberg discontinuity is located at 65±5 km, but in several models sampling the Mediterranean, the lid is missing or its thickness is reduced to ~30 km. In the Gibraltar and North Africa this boundary is located at ~100 km. The lid Vp/Vs beneath Betics is reduced relative to the standard 1.8. Another evidence of the Vp/Vs anomaly is provided by S410p phase late arrivals in the SRFs. The azimuthal anisotropy analysis with a new technology was conducted at 5 stations and at 2 groups of stations. The fast direction in the uppermost mantle layer is ~90º in Iberian Massif. In Balearic is in the azimuth of ~120º. At a depth of ~60 km the direction becomes 90º. Anisotropy in the upper layer can be interpreted as frozen, whereas anisotropy in the lower layer is active, corresponding to the present-day or recent flow. The effect of the asthenosphere in the SKS splitting is much larger than the effect of the subcrustal lithosphere.por
dc.identifier.citationMORAIS; I.; [et al] – Deep structure of crust and mantle beneath Iberia and Western Mediterranean from P and S Receiver functions and SKS Waveforms. In Proceedings of the 3rd QUEST Workshop. 2012por
dc.identifier.urihttp://hdl.handle.net/10400.21/5147
dc.language.isoengpor
dc.peerreviewedyespor
dc.titleDeep structure of crust and mantle beneath Iberia and Western Mediterranean from P and S Receiver functions and SKS Waveformspor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.titleProceedings of the 3rd QUEST Workshoppor
person.familyNameSilveira
person.givenNameGraça
person.identifier91922
person.identifier.ciencia-id1116-1080-16F3
person.identifier.orcid0000-0002-2110-2554
person.identifier.ridA-3081-2009
person.identifier.scopus-author-id6602698071
rcaap.rightsclosedAccesspor
rcaap.typeconferenceObjectpor
relation.isAuthorOfPublicationd4ff725a-b30b-4acb-906d-b60530a4994f
relation.isAuthorOfPublication.latestForDiscoveryd4ff725a-b30b-4acb-906d-b60530a4994f

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