English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/146984
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

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

AuthorsCorela, C.; Silveira, G.; Matias, L; Schimmel, Martin ; Geissler, W.H.
KeywordsOcean bottom seismometers
Seismic noise
Surface waves
SW Iberia
Tomography
Shear flow
Issue Date2017
PublisherElsevier
CitationTectonophysics, 700-701: 131-149 (2017)
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. © 2017 Elsevier B.V.
Publisher version (URL)http://dx.doi.org/10.1016/j.tecto.2017.02.012
URIhttp://hdl.handle.net/10261/146984
DOI10.1016/j.tecto.2017.02.012
ISSN0040-1951
E-ISSN1879-3266
Appears in Collections:(ICTJA) Artículos
Files in This Item:
File Description SizeFormat 
Schimmel_Tectonophysics_700_131_preprint.pdf3,57 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.