Moreno, X., Gràcia, E., Bartolomé, R., Martínez-Loriente, S., Perea, H., Gómez de la Peña, L., Iacono, C. L., Piñero, E., Pallàs, R., Masana, E. and Dañobeitia, J. J. (2016) Seismostratigraphy and tectonic architecture of the Carboneras Fault offshore based on multiscale seismic imaging: Implications for the Neogene evolution of the NE Alboran Sea. Tectonophysics, 689 . pp. 115-132. DOI 10.1016/j.tecto.2016.02.018.

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Abstract

In the SE Iberian Margin, which hosts the convergent boundary between the European and African Plates, Quaternary faulting activity is dominated by a large left-lateral strike-slip system referred to as the Eastern Betic Shear Zone. This active fault system runs along more than 450 km and it is characterized by low to moderate magnitude shallow earthquakes, although large historical events have also occurred. The Carboneras Fault is the longest structure of the Eastern Betic Shear Zone, and its southern termination extends further into the Alboran Sea. Previously acquired high-resolution data (i.e. swath-bathymetry, TOBI sidescan sonar and sub-bottom profiler) show that the offshore Carboneras Fault is a NE–SW-trending upwarped zone of deformation with a length of 90 km long and a width of 0.5 to 2 km, which shows geomorphic features typically found in subaerial strike-slip faults, such as deflected drainage, pressure ridges and “en echelon” folds. However, the neotectonic, depth architecture, and Neogene evolution of Carboneras Fault offshore is still poorly known. In this work we present a multiscale seismic imaging of the Carboneras Fault (i.e. TOPAS, high-resolution multichannel-seismic reflection, and deep penetration multichannel-seismic reflection) carried out during three successive marine cruises, from 2006 to 2010. The new dataset allowed us to define a total of seven seismostratigraphic units (from Tortonian to Late Quaternary) above the basement, to characterize the tectonic architecture and structural segmentation of the Carboneras Fault, and to estimate its maximum seismic potential. We finally discuss the role of the basement in the present-day tectonic evolution of the Carboneras Fault, and explore the northern and southern terminations of the fault and how the strain is transferred to nearby structures.

Document Type:	Article
Keywords:	Alboran Sea, Seismic reflection, Morphostructure, Seismostratigraphy, Active faulting, Seismic hazard
Research affiliation:	OceanRep > The Future Ocean - Cluster of Excellence
Refereed:	Yes
Open Access Journal?:	Yes
Publisher:	Elsevier
Projects:	Future Ocean
Date Deposited:	06 Oct 2017 10:53
Last Modified:	03 Jun 2019 14:17
URI:	https://oceanrep.geomar.de/id/eprint/39740

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