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PRISM3D: a 3-D reference seismic model for Iberia and adjacent areas

2021-05Journal article Restricted access
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dc.contributor.authorArroucau, Pierre
dc.contributor.authorCustódio, S.
dc.contributor.authorCiviero, Chiara
dc.contributor.authorSilveira, Graça
dc.contributor.authorDias, Nuno
dc.contributor.authorDiaz, J.
dc.contributor.authorVillasenor, A.
dc.contributor.authorBodin, Thomas
dc.date.accessioned2021-06-04T09:49:58Z
dc.date.available2021-06-04T09:49:58Z
dc.date.issued2021-05
dc.description.abstractWe present PRISM3D, a 3-D reference seismic model of P- and S-wave velocities for Iberia and adjacent areas. PRISM3D results from the combination of the most up-to-date earth models available for the region. It extends horizontally from 15 degrees W to 5 degrees E in longitude, 34 degrees N to 46 degrees N in latitude and vertically from 3.5 km above to 200 km below sea level, and is modelled on a regular grid with 10 and 0.5 km of grid node spacing in the horizontal and vertical directions, respectively. It was designed using models inferred from local and teleseismic body-wave tomography, earthquake and ambient noise surface wave tomography, receiver function analysis and active source experiments. It includes two interfaces, namely the topography/bathymetry and the Mohorovkie (Moho) discontinuity. The Moho was modelled from previously published receiver function analysis and deep seismic sounding results. To that end we used a probabilistic surface reconstruction algorithm that allowed to extract the mean of the Moho depth surface along with its associated standard deviation, which provides a depth uncertainty estimate. The Moho depth model is in good agreement with previously published models, although it presents slightly sharper gardients in orogenic areas such as the Pyrenees or the Betic-Rif system. Crustal and mantle P- and S-wave wave speed grids were built separately on each side ofthe Moho depth surface by weighted average of existing models, thus allowing to realistically render the speed gradients across that interface. The associated weighted standard deviation was also calculated, which provides an uncertainty estimation on the average wave speed values at any point of the grid. At shallow depths (<10 km), low P and S wave speeds and high V-P/V-S are observed in offshore basins, while the Iberian Massif, which covers a large part of western Iberia, appears characterized by a rather flat Moho, higher than average V-P and V-S and low V-P/V-S. Conversely, the Betic-Rif system seems to be associated with low V-P and V-S, combined with high V-P/V-S in comparison to the rest of the study area. The most prominent feature of the mantle is the well known high wave speed anomaly related to the Alboran slab imaged in various mantle tomography studies. The consistency of PRISM3D with previous work is verified by comparing it with two recent studies, with which it shows a good general agreement.The impact of the new 3-D model is illustrated through a simple synthetic experiment, which shows that the lateral variations of the wave speed can produce traveltime differences ranging from -1.5 and 1.5 s for P waves and from -2.5 and 2.5 s for S waves at local to regional distances. Such values are far larger than phase picking uncertainties and would likely affect earthquake hypocentral parameter estimations. The new 3-D model thus provides a basis for regional studies including earthquake source studies, Earth structure investigations and geodynamic modelling of Iberia and its surroundings.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationARROUCAU, P.; [et al] – PRISM3D: a 3-D reference seismic model for Iberia and adjacent áreas. Geophysical Journal International. ISSN 0956-540X. Vol. 225, N.º 2 (2021), pp. 789-810pt_PT
dc.identifier.doi10.1093/gji/ggab005pt_PT
dc.identifier.eissn1365-246X
dc.identifier.issn0956-540X
dc.identifier.urihttp://hdl.handle.net/10400.21/13415
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherOxford Univ. Presspt_PT
dc.relationPTDC/GEO-FIQ/2590/2014 - FCT project SPIDER -Seismogenic processes in slowly deforming regionspt_PT
dc.relation13/CDA/2192 - Science Foundation Ireland European Commissionpt_PT
dc.relation2016-PD-06 - Geological Survey of Irelandpt_PT
dc.relation13/CDA/2192 - Marine Institutept_PT
dc.relation16/IA/4598 - Marine Institutept_PT
dc.relationFCTUIDB/50019/2020 - IDLpt_PT
dc.subjectComposition and structure of the continental crustpt_PT
dc.subjectComposition and structure of the mantlept_PT
dc.subjectStructure of the earthpt_PT
dc.subjectBody wavespt_PT
dc.subjectSeismicity and tectonicspt_PT
dc.subjectSurface waves and free oscillationspt_PT
dc.titlePRISM3D: a 3-D reference seismic model for Iberia and adjacent areaspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage810pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage789pt_PT
oaire.citation.titleGeophysical Journal Internationalpt_PT
oaire.citation.volume225pt_PT
person.familyNameArroucau
person.familyNameCiviero
person.familyNameSilveira
person.familyNameDias
person.familyNameBodin
person.givenNamePierre
person.givenNameChiara
person.givenNameGraça
person.givenNameNuno
person.givenNameThomas
person.identifier1036360
person.identifier91922
person.identifier1348964
person.identifier.ciencia-id7F1D-761A-A8CB
person.identifier.ciencia-id1116-1080-16F3
person.identifier.ciencia-idDB10-5086-2205
person.identifier.orcid0000-0003-4142-227X
person.identifier.orcid0000-0002-6809-933X
person.identifier.orcid0000-0002-2110-2554
person.identifier.orcid0000-0001-7672-4476
person.identifier.orcid0000-0002-7393-6112
person.identifier.ridK-3909-2015
person.identifier.ridA-3081-2009
person.identifier.ridB-2778-2008
person.identifier.ridN-7716-2015
person.identifier.scopus-author-id14018877600
person.identifier.scopus-author-id56841629500
person.identifier.scopus-author-id6602698071
person.identifier.scopus-author-id56640885300
person.identifier.scopus-author-id23468854900
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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