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Ambient seismic noise tomography of SW Iberia integrating seafloor- and land-based data

2017-03Journal article Restricted access
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dc.contributor.authorCorela, Carlos
dc.contributor.authorSilveira, Graça
dc.contributor.authorMatias, Luis
dc.contributor.authorSchimmel, Martin
dc.contributor.authorGeissler, Wolfram
dc.date.accessioned2017-05-09T12:20:10Z
dc.date.available2017-05-09T12:20:10Z
dc.date.issued2017-03
dc.description.abstractWe used ambient seismic noise recorded by 24 Broadband Ocean Bottom Seismometers (OBS) deployed in the Gulf of Cadiz during the EC funded NEAREST project and seven broadband land stations located in the South of Portugal to image the sedimentary and crustal structure beneath the Eastern Atlantic and SW Iberia. We computed ambient noise cross-correlations to obtain empirical Green's functions (EGFs) between all station pairs using land seismometers and both OBS sensors, seismometers and hydrophones. Despite the great difference in the recording conditions and local crustal structure between the OBSs and land stations, we could compute EGFs, by applying a linear cross-correlation with running absolute mean average time normalization, followed by a time-frequency phase weighted stack. Dispersion analysis was then applied to the EGFs, between 4 and 20s period. The obtained dispersion curves allowed mapping the lateral variation of Rayleigh-wave group velocities, as a function of period. Finally, dispersion curves extracted from each cell of the 2D group velocity maps were inverted, as a function of depth, to obtain the 3D distribution of the shear-wave velocities. The 3-D shear wave velocity model, computed from joint inversion of OBSs and land stations data allowed to estimate the thickness of sediments and crust and the Moho depth. Despite the gap that exists between the OBSs and land station locations, our model displays a good correlation with the known geological structure. The derived sedimentary layer and crustal thicknesses and the obtained Moho depth are locally in agreement with the models proposed by other studies using near vertical, refraction and wide-angle seismic profiling. We conclude that ambient noise tomography could be a valuable tool to image oceanic domains, and also that it is possible to integrate seafloor- and land-based stations to derive a structure model in the transition domain between continent and ocean.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCORELA, Carlos; [et al] – Ambient seismic noise tomography of SW Iberia integrating seafloor- and land-based data. Tectonophysics. ISSN 0040-1951. Vol. 700-701, (2017) pp. 131-149pt_PT
dc.identifier.doi10.1016/j.tecto.2017.02.012pt_PT
dc.identifier.issn0040-1951
dc.identifier.urihttp://hdl.handle.net/10400.21/6992
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttp://ac.els-cdn.com/S0040195117300586/1-s2.0-S0040195117300586-main.pdf?_tid=19203042-34af-11e7-846c-00000aab0f26&acdnat=1494331410_1003c260aedf48c206537d5e0eb62a05pt_PT
dc.subjectSeismic noisept_PT
dc.subjectSurface wavespt_PT
dc.subjectTomographypt_PT
dc.subjectOcean bottom seismometerspt_PT
dc.subjectSW Iberiapt_PT
dc.titleAmbient seismic noise tomography of SW Iberia integrating seafloor- and land-based datapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage149pt_PT
oaire.citation.startPage131pt_PT
oaire.citation.titleTectonophysicspt_PT
oaire.citation.volume700pt_PT
person.familyNameCorela
person.familyNameSilveira
person.familyNameMatias
person.familyNameSchimmel
person.familyNameGeissler
person.givenNameCarlos
person.givenNameGraça
person.givenNameLuis
person.givenNameMartin
person.givenNameWolfram
person.identifier91922
person.identifier693396
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person.identifier.ciencia-id6418-129D-A73E
person.identifier.ciencia-id3214-52D1-5021
person.identifier.orcid0000-0002-0150-2286
person.identifier.orcid0000-0002-2110-2554
person.identifier.orcid0000-0002-8086-4874
person.identifier.orcid0000-0003-2601-4462
person.identifier.orcid0000-0001-6807-555X
person.identifier.ridM-1567-2014
person.identifier.ridA-3081-2009
person.identifier.ridK-7347-2012
person.identifier.ridC-2261-2008
person.identifier.scopus-author-id37045305000
person.identifier.scopus-author-id6602698071
person.identifier.scopus-author-id6701795172
person.identifier.scopus-author-id7005628038
person.identifier.scopus-author-id7102432943
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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