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Title: Seismicity along the Azores-Gibraltar region and global plate kinematics
Authors: Bezzeghoud, Mourad
Adam, Claudia
Buforn, Elisa
Borges, José F.
Caldeira, Bento
Keywords: Seismicity
Global plate kinematics
Focal mechanism
Seismic slip velocity
Kinematic velocity
Slip vector
Total seismic moment tensor
Azores- Gibraltar region
Issue Date: 2014
Publisher: Springer
Citation: Bezzeghoud et al. (2014)
Abstract: Seismicity along the western part of the Eurasia–Nubia plate boundary displays very complex patterns. The average motion is transtensional in the Azores, dextral along the Gloria transform zone and convergent between the SW Portuguese Atlantic margin and the Ibero-Maghrebian zone. To constrain the factors controlling the seismicity, we provide a new seismotectonic synthesis using several earthquakes. We show that the study area can be divided into six different regions, with each characterised by a coherent seismicity pattern. The total seismic moment tensor and the average slip velocities are provided for each region. To determine the spatial distribution of the seismicity, we computed the slip vector for each earthquake based on its focal mechanism and compared it to the relative velocity between the Eurasian and Nubian plates, deduced from global kinematic models. Despite local departures in the Alboran Sea and near theMid-Atlantic Ridge, we found a good correlation between these two independent vector sets. Quantitatively, the slip velocities display a linear, nonaffine correlation with the norms of the relative kinematic velocities. The norms of the slip velocities also seem to depend on the tectonic regime and on the morphology of the plate boundary.
Type: article
Appears in Collections:FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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