@inbook {PereaHGraciaE.BartolomeRGomezdelaPenaL.Martinez-LorienteS.MorenoX.DeMolB.TelloO.BallesterosM.2014, title = {{Evidences of quaternary active faults across the Djibouti high and the Adra Ridge (Alboran Sea)}}, booktitle = {Una aproximaci{\'o}n multidisciplinar al estudio de fallas activas, los terremotos y el riesgo s{\'\i}smico}, year = {2014}, pages = {97{\textendash}100}, 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 = {Perea, H and Gr{\`a}cia, E. and Bartolom{\'e}, R and G{\'o}mez de la Pe{\~n}a, L. and Martinez-Loriente, S. and Moreno, X. and De Mol, B. and Tello, O. and Ballesteros, M. and cruise Party, EVENT-DEEP} } @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.} } @inbook {PereaHGraciaE.BartolomeRMartinez-Loriente2014, title = {{Submarine paleoseismology on the Santa Pola fault (Bajo Segura basin, western mediterranean): derivating direct on-fault paleoearthquakes}}, booktitle = {Una aproximaci{\'o}n multidisciplinar al estudio de fallas activas, los terremotos y el riesgo s{\'\i}smico}, year = {2014}, pages = {121{\textendash}124}, 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 = {Perea, H and Gr{\`a}cia, E. and Bartolom{\'e}, R and Martinez-Loriente, S.} } @inbook {GomezdelaPenaL.RaneroC.R.GraciaE.BartolomeR.2014, title = {{T{\'e}cnicas avanzadas de procesado de datos de s{\'\i}smica de reflexi{\'o}n multicanal aplicadas a mejorar la visualizaci{\'o}n de fallas activas del Mar de Albor{\'a}n}}, booktitle = {Una aproximaci{\'o}n multidisciplinar al estudio de fallas activas, los terremotos y el riesgo s{\'\i}smico}, year = {2014}, pages = {229{\textendash}232}, 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 = {G{\'o}mez de la Pe{\~n}a, L. and Ranero, C.R. and Gr{\`a}cia, E. and R., Bartolome and cruise Party, TopoMed} } @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 {Alfaro2012, title = {{The Bajo Segura Fault Zone: Active blind thrusting in the Eastern Betic Cordillera (SE Spain)}}, journal = {Journal of Iberian Geology}, volume = {38}, number = {1}, year = {2012}, month = {sep}, pages = {287{\textendash}300}, abstract = {The Bajo Segura Fault Zone, located at the NE end of the Eastern Betic Shear Zone, has been the site of some of the most intense seismic activity on the Iberian Peninsula in the historical and instrumental time periods. This structure is an active blind fault that does not show any surface rupture. It is characterised by a set of ENE-WSW trending blind thrust faults that offset the Triassic basement and cause active folding of the Upper Miocene-Quaternary sedimentary cover. The main active structures of this fault zone are two ENE-WSW striking reverse blind faults, the Torremendo and the Bajo Segura Faults, and several secondary NW-SE striking dextral faults (San Miguel de Salinas, Torrevieja and Guardamar Faults). These structures continue offshore to the east. From geological, geomorphological and geodetic data, we obtain fault slip rates between 0.2 and 0.4 mm/yr, whereas other authors have proposed higher values ranging between 0.75 and 1 mm/yr. The fault zone can generate earthquakes with maximum estimated magnitudes (Mw) from 6.6 to 7.1 and has approximate recurrence intervals between 4.500 and 21.500 years.}, keywords = {Active blind thrust, Bajo segura fault, Eastern betic shear zone, Palaeoseismology, Slip rate}, issn = {1886-7995}, doi = {10.5209/rev\_JIGE.2012.v38.n1.39217}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84861777780\&partnerID=tZOtx3y1}, author = {Alfaro, P. and Bartolom{\'e}, R and Borque, M.J. and Est{\'e}vez, A. and Garc{\'\i}a-Mayordomo, J. and Garc{\'\i}a-Tortosa, F.J. and Gil, A.J. and Gr{\`a}cia, E. and Lo Iacono, C. and Perea, H.} } @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 {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.} } @article {Nemser, title = {{Compilation of parameterized seismogenic sources in Iberia for the SHARE European-scale seismic source model.}}, year = {2010}, pages = {201{\textendash}204}, keywords = {Database, Fault, Seismogenic, SHARE}, isbn = {978-84-693-6088-0}, url = {https://dspace.uevora.pt/rdpc/handle/10174/6247}, author = {Nemser, E.S. and Garc{\'\i}a-Mayordomo, J. and Cabral, J. and Fonseca, J. and Mart{\'\i}nez-D{\'\i}az, J.J. and Alfaro Garc{\'\i}a, P. and {\`A}lvarez G{\'o}mez, J.A. and Atakan, K. and Aza{\~n}{\'o}n Hern{\'a}ndez, J.M. and Basili, R. and Besana-Ostman, G.M. and Bezzeghoud, M. and Borges, J.F. and Brum da Silveira, A. and Carlos Lopes, F. and Carvalho, J. and Dias, R.P. and Figueiredo, P.M. and Garc{\'\i}a Fern{\'a}ndez, M. and Giner Robles, J. and Gonzalez, A. and Gr{\`a}cia, E. and Gutierrez, F. and Insua Ar{\'e}valo, J.M. and Jim{\'e}nez, M.J. and Jim{\'e}nez-D{\'\i}az, A. and Lafuente Tom{\'a}s, P. and Lucha, P. and Madeira, J. and Martin Gonz{\'a}lez, F. and Masana, E. and Matias, L. and Moreno, X. and Ortu{\~n}o, M. and Perea, H. and P{\'e}rez L{\'o}pez, R. and Rodr{\'\i}guez Pascua, M.A. and Ruano, P. and Santanach, P. and Sanz de Galdeano, C. and Silva Barroso, P. and Silva, S. and Sim{\'o}n, J.L. and Terrinha, P. and Vilanova, S. and Villamor, P. and Wong, J.} } @booklet {Perea2013, title = {{Structure and Potential Seismogenic Sources of the Offshore Bajo Segura Fault Zone, Se Iberian Peninsula (Mediterranean Sea). Looking for the Source of the 1829 Torrevieja Earthquake}}, journal = {Res{\'u}menes de la 1{\textordfeminine} Reuni{\'o}n Ib{\'e}rica sobre Fallas Activas y Paleosismolog{\'\i}a, Sig{\"u}enza, Espa{\~n}a}, year = {2010}, month = {sep}, pages = {113{\textendash}116}, abstract = {Primera Reuni{\'o}n Ib{\'e}rica sobre Fallas Activas y Paleosismolog{\'\i}a. Sig{\"u}enza (Guadalajara, Espa{\~n}a) 27, 28 y 29 de Octubre de 2010.{\textendash} 4 pages, 4 figures}, keywords = {abstract, almost a, bajo segura, been extensively studied, betic shear zone and, bsfz, complete lack of information, during the event-shelf cruise, extends further, fallas activas, from a tectonic point, geolog{\'\i}a marina, into the mediterranean sea, is the northern terminal, of the bsfz has, of view, splay of the eastern, tect{\'o}nica activa, ten high-resolution seismic profiles, the bajo segura fault, the offshore zone has, whereas the onshore zone, zone}, isbn = {isbn: 978-84-693-6088-0}, url = {http://digital.csic.es/handle/10261/82456}, author = {Perea, H. and Gr{\`a}cia, E. and Bartolom{\'e}, Rafael and Iacono, Claudio Lo and Masana, E.} } @article {Zitellini2009, title = {{The quest for the Africa{\textendash}Eurasia plate boundary west of the Strait of Gibraltar}}, journal = {Earth and Planetary Science Letters}, volume = {280}, number = {1-4}, year = {2009}, month = {apr}, pages = {13{\textendash}50}, abstract = {The missing link in the plate boundary between Eurasia and Africa in the central Atlantic is presented and discussed. A set of almost linear and sub parallel dextral strike-slip faults, the SWIM11SWIM is the acronym of the ESF EuroMargins project "Earthquake and Tsunami hazards of active faults at the South West Iberian Margin: deep structure, high-resolution imaging and paleoseismic signature". Faults, that form a narrow band of deformation over a length of 600~km coincident with a small circle centred on the pole of rotation of Africa with respect to Eurasia, was mapped using a new swath bathymetry compilation available in the area offshore SW Portugal. These faults connect the Gloria Fault to the Rif-Tell Fault Zone, two segments of the plate boundary between Africa and Eurasia. The SWIM faults cut across the Gulf of Cadiz, in the Atlantic Ocean, where the 1755 Great Lisbon earthquake, M \~{} 8.5-8.7, and tsunami were generated, providing a new insight on its source location. {\textcopyright} 2008 Elsevier B.V. All rights reserved.}, keywords = {Africa-Eurasia plate boundary, Great Lisbon Earthquake, Gulf of Cadiz, Iberia, Nubia}, issn = {0012821X}, doi = {10.1016/j.epsl.2008.12.005}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-62749129333\&partnerID=tZOtx3y1}, author = {Zitellini, N. and Gr{\`a}cia, E. and Matias, L. and Terrinha, P. and Abreu, M.A. and DeAlteriis, G. and Henriet, J.P. and Da{\~n}obeitia, J.J. and Masson, D.G. and Mulder, T.} } @article {Lebreiro2009, title = {{Sediment instability on the Portuguese continental margin under abrupt glacial climate changes (last 60kyr)}}, journal = {Quaternary Science Reviews}, volume = {28}, number = {27-28}, year = {2009}, month = {dec}, pages = {3211{\textendash}3223}, abstract = {It is well established that orbital scale sea-level changes generated larger transport of sediments into the deep-sea during the last glacial maximum than the Holocene. However, the response of sedimentary processes to abrupt millennial-scale climate variability is rather unknown. Frequency of distal turbidites and amounts of advected detrital carbonate are estimated off the Lisbon-Set{\'u}bal canyons (core MD03-2698, at 4602 mwd), within a chronostratigraphy based on radiometric ages, oxygen isotopes and paleomagnetic key global anomalies. We found that: 1) higher frequency of turbidites concurred with Northern Hemisphere coldest temperatures (Greenland Stadials [GS], including Heinrich [H] events). But more than that, an escalating frequency of turbidites starts with the onset of global sea-level rising (and warming in Antarctica) and culminates during H events, at the time when rising is still in its early-mid stage, and the Atlantic Meridional Overturning Circulation (AMOC) is re-starting. This short time span coincides with maximum gradients of ocean surface and bottom temperatures between GS and Antarctic warmings (Antarctic Isotope Maximum; AIM 17, 14, 12, 8, 4, 2) and rapid sea-level rises. 2) Trigger of turbidity currents is not the only sedimentary process responding to millennial variability; land-detrital carbonate (with a very negative bulk $δ$18O signature) enters the deep-sea by density-driven slope lateral advection, accordingly during GS. 3) Possible mechanisms to create slope instability on the Portuguese continental margin are sea-level variations as small as 20 m, and slope friction by rapid deep and intermediate re-accommodation of water masses circulation. 4) Common forcing mechanisms appear to drive slope instability at both millennial and orbital scales. {\textcopyright} 2009.}, issn = {02773791}, doi = {10.1016/j.quascirev.2009.08.007}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-70549094210\&partnerID=tZOtx3y1}, author = {Lebreiro, S.M. and Voelker, A.H.L. and Vizcaino, A. and Abrantes, F.G. and Alt-Epping, U. and Jung, S. and Thouveny, N. and Gr{\`a}cia, E.} } @article {Vazquez2008, title = {{Cenozoic deformational structures on the Galicia Bank Region (NW Iberian continental margin)}}, journal = {Marine Geology}, volume = {249}, number = {1-2}, year = {2008}, month = {mar}, pages = {128{\textendash}149}, abstract = {An analysis of Cenozoic tectonics was carried out on the Galicia Bank Region by means of 750~km of single-channel and 155~km of multi-channel vertical seismic profiles and multibeam bathymetry. This work forms part of a general study aimed at determining the geological risk in the wreck area of the Prestige oil tanker. Several structures affecting the post-rift sedimentary units were identified: I) Faults inherited from the Lower Cretaceous propagating rift (reactivated and non-reactivated), including reactivated normal (N-S, NW-SE) and transfer (NE-SW) faults; and II) Structures resulting from compressive episodes in the Paleogene to Upper Miocene and the Upper Miocene to the Present, including a) neotectonic normal faults decoupled from the basement structure, b) folds and flexures and c) reverse faults (NE-SW to ENE-SWS) related to the Bay of Biscay subduction, that are the most striking regional structures. The characterization of structural style, sedimentary post-rift unit deformation and morphological trends were used to carry out a detailed study of the morphostructure of the Galicia Bank Region. Six morphostructural provinces were differentiated, from E to W: 1) the Galicia Interior Basin related to a main graben; 2) the Transitional Zone, which is a horst and graben territory; 3) the Galicia Bank Main Horst; 4) the Half-Graben Domain; 5) the Deep Galicia Margin, whose structure shows rotated blocks; and 6) the Northwestern Flank, characterized by reverse faults. The Transitional Zone and the Galicia Bank provinces are assumed to be the two morphostructural provinces of the Galicia Bank marginal platform. The origin of the Cenozoic deformation must have been related to reactivation processes during the Pyrenean orogeny. We propose that the fault pattern observed in the study area is related to the phase of renewed Mesozoic fault activity. Polyphase extension in the rifting stage and Cenozoic movements have produced an extensional interference pattern that is evident in the physiography. The decouplage between basement tectonics and upper sedimentary unit tectonics suggests the presence of a viscous layer. A thrust-related main antiform related to the Bay of Biscay subduction is proposed to explain the origin of the Galicia Bank morphology. {\textcopyright} 2007 Elsevier B.V. All rights reserved.}, keywords = {Cenozoic, fault reactivation, Galicia Bank, morphostructure, physiography, tectonics}, issn = {00253227}, doi = {10.1016/j.margeo.2007.09.014}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39549103245\&partnerID=tZOtx3y1}, author = {V{\'a}zquez, J.T. and Medialdea, T. and Ercilla, G. and Somoza, L. and Estrada, F. and Fern{\'a}ndez Puga, M.C. and Gallart, J. and Gr{\`a}cia, E. and Maestro, A. and Sayago, M.} } @article {Ercilla2008, title = {{High-resolution seismic stratigraphy of the Galicia Bank Region and neighbouring abyssal plains (NW Iberian continental margin)}}, journal = {Marine Geology}, volume = {249}, number = {1-2}, year = {2008}, month = {mar}, pages = {108{\textendash}127}, abstract = {The high-resolution seismic stratigraphy of the Galicia Bank Region and adjacent deposits of the neighbouring Iberian and Biscay Abyssal Plains was included as part of the geological studies conducted in the area where the oil-tanker Prestige wreck is located. This seismic stratigraphy is characterized by five seismic units (5 to 1, from oldest to youngest) lying above an irregular acoustic basement defined by a highly fractured system of horsts and grabens. These faulted systems have controlled the local depositional architecture, deforming, fracturing, relocating and distributing sediments since the Valanginian. Three depositional models of facies can be recognized on the Galicia Bank Region and surrounding abyssal plains: bank, escarpment, and abyssal plain facies. The bank facies reflects the depositional evolution from initial filling to obliterating stages of the horsts and grabens. The escarpment facies has a local distribution and represents deposition associated with active slopes of the faulted escarpments. The abyssal plain facies represents gravity flow deposits coming mostly from the bounded-fault flanks of the Galicia Bank Region. The Valanginian to Quaternary sedimentary evolution of the Galicia Bank Region reflects depositional responses to tectonic condition. The occurrence of mass-movements confirms that the syn-rift period (Valanginian to Aptian age) along the Galicia margin was diachronous, beginning in the Interior Basin and shifting later toward the west of the Galicia Bank Region (Deep Galicia Margin). The Albian to Quaternary post-rift evolution is characterized by a decrease in tectonic activity and sedimentary variations in the style of deposition (valley and related features, mass-movement deposits, contourites, and drape deposits) conditioned by changes in the sedimentary processes, paleoenvironments, and tectonic reactivation of the regional slopes. The effects of tectonic movements persist, as evidenced in areas where faulted escarpments and highs outcrop, and in areas of near-surface faulting. The syn-rift and post-rift stages have also conditioned the depositional architecture of the Prestige sinking area. The evolution of the surrounding abyssal plains does not reflect the same pattern to tectonic condition. {\textcopyright} 2007 Elsevier B.V. All rights reserved.}, keywords = {facies architecture, Galicia Bank, high-resolution seismic profiles, sedimentary evolution, seismic facies, stratigraphy}, issn = {00253227}, doi = {10.1016/j.margeo.2007.09.009}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39649109232\&partnerID=tZOtx3y1}, author = {Ercilla, G. and Garc{\'\i}a-Gil, S. and Estrada, F. and Gr{\`a}cia, E. and Vizcaino, A. and V{\'a}quez, J.T. and D{\'\i}az, S. and Vilas, F. and Casas, D. and Alonso, B. and Da{\~n}obeitia, J. and Farran, M.} } @article {Goldfinger2008, title = {{Late Holocene Rupture of the Northern San Andreas Fault and Possible Stress Linkage to the Cascadia Subduction Zone}}, journal = {Bulletin of the Seismological Society of America}, volume = {98}, number = {2}, year = {2008}, month = {apr}, pages = {861{\textendash}889}, abstract = {We relate the late Holocene northern San Adreas fault (NSAF) paleoseismic history developed using marine sediment cores along the northern California continental margin to a similar dataset of cores collected along the Cascadia margin, including channels from Barclay Canyon off Vancouver Island to just north of Monterey Bay. Stratigraphic correlation and evidence of synchronous triggering imply earthquake origin, and both temporal records are compatible with onshore paleoseismic data. In order to make comparisons between the temporal earthquake records from the NSAF and Cascadia, we refine correlations of southern Cascadia great earthquakes, including the land paleoseismic record. Along the NSAF during the last \~{}2800 yr, 15 turbidites, including one likely from the great 1906 earthquake, establish an average repeat time of \~{}200 yr, similar to the onshore value of \~{}240 yr. The combined land and marine paleoseismic record from the southern Cascadia subduction zone includes a similar number of events during the same period. While the average recurrence interval for full-margin Cascadia events is \~{}520 yr, the southern Cascadia margin has a repeat time of \~{}220 yr, similar to that of the NSAF. Thirteen of the 15 NSAF events were preceded by Cascadia events by \~{}0-80 yr, averaging 25-45 yr (as compared to \~{}80-400 yr by which Cascadia events follow the NSAF). Based on the temporal association, we model the coseismic and cumulative postseismic deformation from great Cascadia megathrust events and compute related stress changes along the NSAF in order to test the possibility that Cascadia earthquakes triggered the penultimate, and perhaps other, NSAF events. The Coulomb failure stress (CFS) resulting from viscous deformation related to a Cascadia earthquake over \~{}60 yr does not contribute significantly to the total CFS on the NSAF. However, the coseismic deformation increases CFS on the northern San Andreas fault (NSAF) by up to about 9 bars offshore of Point Delgada, most likely enough to trigger that fault to fail in north-to-south propagating ruptures.}, issn = {0037-1106}, doi = {10.1785/0120060411}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-42649087275\&partnerID=tZOtx3y1}, author = {Goldfinger, C. and Grijalva, K. and Burgmann, R. and Morey, A. E. and Johnson, J. E. and Nelson, C. H. and Gutierrez-Pastor, J. and Ericsson, A. and Karabanov, E. and Chaytor, J. D. and Patton, J. and Gr{\`a}cia, E.} } @article {Hernandez-Molina2008, title = {{Recent sedimentary processes in the Prestige site area (Galicia Bank, NW Iberian Margin) evidenced by high-resolution marine geophysical methods}}, journal = {Marine Geology}, volume = {249}, number = {1-2}, year = {2008}, month = {mar}, pages = {21{\textendash}45}, abstract = {An echo-character analysis of the oil tanker Prestige wreck area was undertaken using high-resolution marine geophysical methods (TOPAS and airgun seismic-reflection profiles, multibeam echosounder and TOBI sidescan sonar). Integration and comparison of the results using all these methods is presented given some practical applications for indirect near-surface and seafloor interpretations. Ten different echo types were identified and grouped into four main classes: I) distinct; II) indistinct; III) irregular and IV) hyperbolic. Echo-character distribution enabled us to determine recent sedimentary processes in the area. Two major depositional systems can be found through the identification of these sedimentary processes: a) a slope depositional system (SDS) located in the eastern and central area, where mass-movement processes are dominant and b) a turbiditic Main Channel depositional system (TDS) located in the western area where channel-related processes are dominant. Both of these interact over the half-graben structure of the southwestern sector of the Galicia Bank, where the Prestige wreck is located. Within the SDS, erosive and depositional mass-movement processes characterised a complex depositional system. Erosive processes occur on the fault scarp, channels head, inter-lobe channels and distal part of the sedimentary lobes. Moreover, depositional processes take place on the top of the fault scarp, sedimentary wedges, sedimentary lobes, and on the west flank of the Main Channel. Both depositional systems interact, but the SDS should be more active during fault-scarp reactivation periods, through relief rejuvenation and new exposed deposits. Microearthquake activity would favour the available materials, being weathered, eroded and transported by mass-movements. In such a situation, the TDS acts as the main collector of eroded sediment derived from the fault scarp throughout the SDS being responsible for its evacuation into the Iberian Abyssal Plain. However, outside of fault reactivation periods, the SDS is less active (such as during the present situation). {\textcopyright} 2007 Elsevier B.V. All rights reserved.}, keywords = {echo-character analysis, Galicia Bank, high-resolution seismic profiles, sedimentary process, swath bathymetry, TOBI sidescan sonar}, issn = {00253227}, doi = {10.1016/j.margeo.2007.09.011}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39549115454\&partnerID=tZOtx3y1}, author = {Hern{\'a}ndez-Molina, F.J. and Llave, E. and Ercilla, G. and Maestro, A. and Medialdea, T. and Ferrin, A. and Somoza, L. and Gr{\`a}cia, E. and Masson, D.G. and Garc{\'\i}a, M. and Vizcaino, A. and Le{\'o}n, R.} }