@inbook {GraciaE.BartolomeR.PereaH.MorenoX.GomezdelaPenaL.RaneroC.RLoIaconoC.Martinez-LorienteS.DiezS.MasanaE.Danobeitia2014, title = {{Seismic hazard of active faults in the Alboran Sea inferred from submarine paleosismology}}, booktitle = {Una aproximaci{\'o}n multidisciplinar al estudio de fallas activas, los terremotos y el riesgo s{\'\i}smico}, year = {2014}, pages = {101{\textendash}104}, isbn = {978-84-617-2049-1}, url = {http://www.researchgate.net/publication/267574309\_Una\_aproximacin\_multidisciplinar\_al\_estudio\_de\_las\_fallas\_activas\_los\_terremotos\_y\_el\_riesgo\_ssmico}, author = {Gr{\`a}cia, E. and Bartolome, R. and Perea, H. and Moreno, X. and G{\'o}mez de la Pe{\~n}a, L. and Ranero, C.R and Lo Iacono, C. and Martinez-Loriente, S. and Diez, S. and Masana, E. and Da{\~n}obeitia, J.} } @booklet {HensenC.ScholzF.MarianneN.ValadaresV.GraciaE.TerrinhaP.LiebetrauV.KaulN.SilvaS.Martinez-lorienteS.BartolomeR.PineroE.MagalhaesV.H.SchmidtM.WeiseS.M.CunhaM.HilarioA.Pereah.RovelliL.2014, title = {{Strike-slip Faults Mediate the Rise of Basement-Derived Fluids and Mud Volcanism in the Deep Sea}}, year = {2014}, keywords = {Geology}, author = {Hensen, C. and Scholz, F. and Marianne, N. and Valadares, V. and Gr{\`a}cia, E. and Terrinha, P. and Liebetrau, V. and Kaul, N. and Silva, S. and Martinez-Loriente, S. and Bartolome, R. and Pi{\~n}ero, E. and Mag{\~a}lhaes, V.H. and Schmidt, M. and S.M., Weise and Cunha, M. and Hilario, A. and Perea, H. and Rovelli, L. K.} } @article {Gracia2012a, title = {{Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake}}, journal = {Natural Hazards and Earth System Science}, volume = {12}, number = {11}, year = {2012}, month = {nov}, pages = {3255{\textendash}3267}, publisher = {European Geosciences Union}, abstract = {Recently acquired swath-bathymetry data and high-resolution seismic reflection profiles offshore Adra (Almer{\'\i}a, Spain) reveal the surficial expression of a NW-SE trending 20 km-long fault, which we termed the Adra Fault. Seismic imaging across the structure depicts a sub-vertical fault reaching the seafloor surface and slightly dipping to the NE showing an along-axis structural variability. Our new data suggest normal displacement of the uppermost units with probably a lateral component. Radiocarbon dating of a gravity core located in the area indicates that seafloor sediments are of Holocene age, suggesting present-day tectonic activity. The NE Alboran Sea area is characterized by significant low-magnitude earthquakes and by historical records of moderate magnitude, such as the Mw Combining double low line 6.1 1910 Adra Earthquake. The location, dimension and kinematics of the Adra Fault agree with the fault solution and magnitude of the 1910 Adra Earthquake, whose moment tensor analysis indicates normal-dextral motion. The fault seismic parameters indicate that the Adra Fault is a potential source of large magnitude (Mw <= 6.5) earthquakes, which represents an unreported seismic hazard for the neighbouring coastal areas.{\textcopyright} 2013 IEEE.}, issn = {1684-9981}, doi = {10.5194/nhess-12-3255-2012}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84881091009\&partnerID=tZOtx3y1 http://digital.csic.es/handle/10261/64147}, author = {Gr{\`a}cia, E. and Bartolome, R. and Lo Iacono, C. and Moreno, X. and Stich, D. and Mart{\'\i}nez-Diaz, J. J. and Bozzano, G. and Martinez-Loriente, S. and Perea, H. and Diez, S. and Masana, E. and Danobeitia, J. J. and Tello, O. and Sanz, J. L. and Carre{\~n}o, E.} } @article {Bartolome2012, title = {{Evidence for active strike-slip faulting along the Eurasia-Africa convergence zone: Implications for seismic hazard in the southwest Iberian margin}}, journal = {Geology}, volume = {40}, number = {6}, year = {2012}, month = {apr}, pages = {495{\textendash}498}, abstract = {New seismic imaging and seismotectonic data from the southwest Iberian margin, the site of the present-day boundary between the European and African plates, reveal that active strike slip is occurring along two prominent lineaments that have recently been mapped using multibeam bathymetry. Multichannel seismic and subbottom profiler images acquired across the lineaments show seafloor displacements and active faulting to depths of at least 10 km and of a minimum length of 150 km. Seismic moment tensors show predominantly WNW-ESE rightlateral strike-slip motion, i.e., oblique to the direction of plate convergence. Estimates of earthquake source depths close to the fault planes indicate upper mantle (i.e., depths of 40-60 km) seismogenesis, implying the presence of old, thick, and brittle lithosphere. The estimated fault seismic parameters indicate that the faults are capable of generating great magnitude (Mw >= 8.0) earthquakes. Such large events raise the concomitant possibility of slope failures that have the potential to trigger tsunamis. Consequently, our findings identify an unreported earthquake and tsunami hazard for the Iberian and north African coastal areas. {\textcopyright} 2012 Geological Society of America.}, issn = {0091-7613}, doi = {10.1130/G33107.1}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84862119131\&partnerID=tZOtx3y1}, author = {Bartolome, R. and Gr{\`a}cia, E. and Stich, D. and Martinez-Loriente, S. and Klaeschen, D. and de Lis Mancilla, F. and Lo Iacono, C. and Danobeitia, J. J. and Zitellini, N.} } @article {Gutscher2012, title = {{The Gibraltar subduction: A decade of new geophysical data}}, journal = {Tectonophysics}, volume = {574-575}, year = {2012}, month = {oct}, pages = {72{\textendash}91}, abstract = {The Gibraltar arc, spans a complex portion of the Africa-Eurasia plate boundary marked by slow oblique convergence and intermediate and deep focus seismicity. The seemingly contradictory observations of a young extensional marine basin surrounded by an arcuate fold-and-thrust belt, have led to competing geodynamic models (delamination and subduction). Geophysical data acquired in the past decade provide a test for these models and support a narrow east-dipping, subduction zone. Seismic refraction studies indicate oceanic crust below the western Gulf of Cadiz. Tomography of the upper mantle reveals a steep, east-dipping high P-wave velocity body, beneath Gibraltar. The anisotropic mantle fabric from SKS splitting shows arc-parallel "fast directions", consistent with toroidal flow around a narrow, westward retreating subducting slab. The accompanying WSW advance of the Rif-Betic mountain belt has constructed a thick pile of deformed sediments, an accretionary wedge, characterized by west-vergent thrust anticlines. Bathymetric swath-mapping images an asymmetric embayment at the deformation front where a 2. km high basement ridge has collided. Subduction has slowed significantly since 5. Ma, but deformation of recent sediments and abundant mud volcanoes suggest ongoing activity in the accretionary wedge. Three possible origins for this deformation are discussed; gravitational spreading, overall NW-SE convergence between Africa and Iberia and finally a WSW tectonic push from slow, but ongoing roll-back subduction. In the absence of arc volcanism and shallow dipping thrust type earthquakes, evidence in favor of present-day subduction can only be indirect and remains the object of debate. Continued activity of the subduction offers a possible explanation for great (M. >. 8.5) earthquakes known to affect the area, like the famous 1755 Great Lisbon earthquake. Recent GPS studies show SW motion of stations in N Morocco at velocities of 3-6. mm/yr indicating the presence of an independent block, a "Rif-Betic-Alboran" microplate, situated between Iberia and Africa. {\textcopyright} 2012 Elsevier B.V.}, keywords = {Accretionary wedge, Active deformation, earthquakes, Iberia, Roll-back subduction, Tethys oceanic lithosphere}, issn = {00401951}, doi = {10.1016/j.tecto.2012.08.038}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84867273669\&partnerID=tZOtx3y1}, author = {Gutscher, M.-A. and Dominguez, S. and Westbrook, G.K. and Le Roy, P. and Rosas, F. and Duarte, J.C. and Terrinha, P. and Miranda, J.M. and Graindorge, D. and Gailler, A. and Sallar{\`e}s, V. and Bartolome, R.} } @article {LoIacono2012a, title = {{Large, deepwater slope failures: Implications for landslide-generated tsunamis}}, journal = {Geology}, volume = {40}, number = {10}, year = {2012}, month = {aug}, pages = {931{\textendash}934}, abstract = {Deepwater landslides are often underestimated as potential tsunami triggers. The North Gorringe avalanche (NGA) is a large (\~{}80 km3 and 35 km runout) newly discovered and deepwater (2900 m to 5100 m depth) mass failure located at the northern fl ank of Gorringe Bank on the southwest Iberian margin. Steep slopes and pervasive fracturing are suggested as the main preconditioning factors for the NGA, while an earthquake is the most likely trigger mechanism. Near-fi eld tsunami simulations show that a mass failure similar to the NGA could generate a wave >15 m high that would hit the south Portuguese coasts in \~{}30 min. This suggests that deepwater landslides require more attention in geo-hazard assessment models of southern Europe, as well as, at a global scale, in seismically active margins. {\textcopyright} 2012 Geological Society of America.}, issn = {0091-7613}, doi = {10.1130/G33446.1}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84868693659\&partnerID=tZOtx3y1}, author = {Lo Iacono, C. and Gr{\`a}cia, E. and Zaniboni, F. and Pagnoni, G. and Tinti, S. and Bartolome, R. and Masson, D. G. and Wynn, R. B. and Lourenco, N. and Pinto de Abreu, M. and Danobeitia, J. J. and Zitellini, N.} } @article {Perea2012, title = {{Quaternary active tectonic structures in the offshore Bajo Segura basin (SE Iberian Peninsula {\textendash} Mediterranean Sea)}}, journal = {Natural Hazards and Earth System Science}, volume = {12}, number = {10}, year = {2012}, month = {oct}, pages = {3151{\textendash}3168}, abstract = {The Bajo Segura fault zone (BSFZ) is the northern terminal splay of the Eastern Betic shear zone (EBSZ), a large left-lateral strike-slip fault system of sigmoid geometry stretching more than 450 km from Alicante to Almera. The BSFZ extends from the onshore Bajo Segura basin further into the Mediterranean Sea and shows a moderate instrumental seismic activity characterized by small earthquakes. Nevertheless, the zone was affected by large historical earthquakes of which the largest was the 1829 Torrevieja earthquake (IEMS98 X). The onshore area of the BSFZ is marked by active transpressive structures (faults and folds), whereas the offshore area has been scarcely explored from the tectonic point of view. During the EVENT-SHELF cruise, a total of 10 high-resolution single-channel seismic sparker profiles were obtained along and across the offshore Bajo Segura basin. Analysis of these profiles resulted in (a) the identification of 6 Quaternary seismo-stratigraphic units bounded by five horizons corresponding to regional erosional surfaces related to global sea level lowstands; and (b) the mapping of the active sub-seafloor structures and their correlation with those described onshore. Moreover, the results suggest that the Bajo Segura blind thrust fault or the Torrevieja left-lateral strike-slip fault, with prolongation offshore, could be considered as the source of the 1829 Torrevieja earthquake. These data improve our understanding of present deformation along the BSFZ and provide new insights into the seismic hazard in the area. {\textcopyright} 2012. Author(s) CC Attribution 3.0 License.}, issn = {1684-9981}, doi = {10.5194/nhess-12-3151-2012}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84867926421\&partnerID=tZOtx3y1}, author = {Perea, H. and Gr{\`a}cia, E. and Alfaro, P. and Bartolome, R. and Lo Iacono, C. and Moreno, X. and Masana, E.} } @article {Rosas2012, title = {{Thrust{\textendash}wrench interference between major active faults in the Gulf of Cadiz (Africa{\textendash}Eurasia plate boundary, offshore SW Iberia): Tectonic implications from coupled analog and numerical modeling}}, journal = {Tectonophysics}, volume = {548-549}, year = {2012}, month = {jun}, pages = {1{\textendash}21}, abstract = {Analog and numerical modeling experiments were carried out to investigate the tectonic interference between intersecting major active strike-slip and thrust faults in the Gulf of Cadiz (Africa-Eurasia plate boundary, offshore SW Iberia). The obtained results show that newly mapped tectonic features located in the fault intersection area (corner zone) consist mostly in oblique (dextral-reverse) faults that accommodate significant strain partitioning. Modeling of this corner-zone faults show that they have endured some degree of rotation, displaying successive evolving geometries and kinematics. Numerical modeling results further show that an interbedded shallow soft layer, accounting for a regional (Late Miocene) gravitational "Chaotic" unit, could explain the mild bathymetric expression of the fault pattern in the corner-zone. Moreover, a recognized depth discrepancy, between the (upper crust) interference fault-pattern and the (lithospheric mantle) seismicity, is interpreted as a manifestation of similar thrust-wrench tectonic interference at different lithospheric depths. Accordingly, an intermediate lower crust-upper mantle aseismic (i.e. softened) depth-domain could be explained by pervasive alteration/serpentinization, prompted by fluid percolation through fault-related fractures associated with the newly revealed corner zone fault-network. Overall obtained results reinforce the relevance of a thrust-wrench multi-rupture seismic scenario as the main cause for the moderate seismicity (Mw < 6.0) in the study area. {\textcopyright} 2012 Elsevier B.V.}, keywords = {Analog and numerical modeling, Fault interference, Gulf of Cadiz, Lithospheric mantle seismicity, Multi-rupture seismic hazards, Thrust-wrench tectonics}, issn = {00401951}, doi = {10.1016/j.tecto.2012.04.013}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84862115104\&partnerID=tZOtx3y1}, author = {Rosas, F.M. and Duarte, J.C. and Neves, M.C. and Terrinha, P. and Silva, S. and Matias, L. and Gr{\`a}cia, E. and Bartolome, R.} }