English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/64112
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:


Neotectonics of the SW Iberia margin, Gulf of Cadiz and Alboran Sea: a reassessment including recent structural, seismic and geodetic data

AuthorsCunha, T. A.; Matias, L.; Terrinha, Pedro; Negredo, Ana M. ; Rosas, Filipe; Fernandes, R. M. S.; Pinheiro, L. M.
KeywordsSeismicity and tectonics
Continental neotectonics
Dynamics: seismotectonics
Kinematics of crustal and mantle deformation
Issue Date26-Jan-2012
PublisherRoyal Astronomical Society
CitationCunha, T. A., Matias, L. M., Terrinha, P., Negredo, A. M., Rosas, F., Fernandes, R. M. S. and Pinheiro, L. M. (2012), Neotectonics of the SW Iberia margin, Gulf of Cadiz and Alboran Sea: a reassessment including recent structural, seismic and geodetic data. Geophysical Journal International, 188: 850–872. doi: 10.1111/j.1365-246X.2011.05328.x
AbstractWe use a thin-shell approximation for the lithosphere to model the neotectonics of the Gulf of Cadiz, SW Iberia margin and the westernmost Mediterranean, in the eastern segment of the Azores–Gibraltar plate boundary. In relation to previous neotectonic models in the region, we utilize a better constrained structural map offshore, and the recent GPS measurements over NW Africa and Iberia have been taken into account, together with the seismic strain rate and stress data, to evaluate alternative geodynamic settings proposed for the region. We show that by assuming a relatively simple, two-plate tectonic framework, where Nubia and Eurasia converge NW–SE to WNW–ESE at a rate of 4.5–6 mm yr−1, the models correctly predict the amount of shortening and wrenching between northern Algeria–Morocco and southern Spain and between NW Morocco and SW Iberia, as estimated from both GPS data and geological constraints. The consistency between modelled and observed velocities in the vicinity of Gibraltar and NW Morocco indicates that forcing by slab sinking beneath Gibraltar is not required to reproduce current horizontal deformation in these areas. In the Gulf of Cadiz and SW Iberia, the modelling results support a diffuse Nubia–Eurasia Plate boundary, where the convergence is accommodated along NNE–SSW to NE–SW and ENE–WSW thrust faults and WNW–ESE right-lateral strike-slip faults, over an area >200 km wide, in good general agreement with the distribution of the seismic strain rate and associated faulting mechanisms. The modelling results are robust to regional uncertainties in the structure of the lithosphere and have important implications for the earthquake and tsunami hazard of Portugal, SW Spain and Morocco. We predict maximum, long-term average fault slip rates between 1–2 mm yr−1, that is, less than 50 per cent the average plate relative movement, suggesting very long return periods for high-magnitude (Mw > 8) earthquakes on individual structures.
Publisher version (URL)http://dx.doi.org/10.1111/j.1365-246X.2011.05328.x
Appears in Collections:(IGEO) Artículos
Files in This Item:
File Description SizeFormat 
GJI_2012_188_850.pdf4,64 MBAdobe PDFThumbnail
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.