@article {Prada2014, title = {{Seismic structure of the Central Tyrrhenian basin: Geophysical constraints on the nature of the main crustal domains}}, journal = {Journal of Geophysical Research: Solid Earth}, volume = {119}, number = {1}, year = {2014}, pages = {52{\textendash}70}, publisher = {Blackwell Publishing Ltd}, abstract = {In this work we investigate the crustal and tectonic structures of the Central Tyrrhenian back-arc basin combining refraction and wide-angle reflection seismic (WAS), gravity, and multichannel seismic (MCS) reflection data, acquired during the MEDOC (MEDiterr{\'a}neo OCcidental)-2010 survey along a transect crossing the entire basin from Sardinia to Campania at 40{\textdegree}N. The results presented include a \~{}450 km long 2-D P wave velocity model, obtained by the traveltime inversion of the WAS data, a coincident density model, and a MCS poststack time-migrated profile. We interpret three basement domains with different petrological affinity along the transect based on the comparison of velocity and velocity-derived density models with existing compilations for continental crust, oceanic crust, and exhumed mantle. The first domain includes the continental crust of Sardinia and the conjugate Campania margin. In the Sardinia margin, extension has thinned the crust from \~{}20 km under the coastline to \~{}13 km \~{}60 km seaward. Similarly, the Campania margin is also affected by strong extensional deformation. The second domain, under the Cornaglia Terrace and its conjugate Campania Terrace, appears to be oceanic in nature. However, it shows differences with respect to the reference Atlantic oceanic crust and agrees with that generated in back-arc oceanic settings. The velocities-depth relationships and lack of Moho reflections in seismic records of the third domain (i.e., the Magnaghi and Vavilov basins) support a basement fundamentally made of mantle rocks. The large seamounts of the third domain (e.g., Vavilov) are underlain by 10-20 km wide, relatively low-velocity anomalies interpreted as magmatic bodies locally intruding the mantle. {\textcopyright}2013. American Geophysical Union. All Rights Reserved.}, keywords = {back-arc crust, exhumed mantle, Rifting, traveltime tomography, Tyrrhenian basin, wide-angle seismics}, issn = {21699313}, doi = {10.1002/2013JB010527}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84896740908\&partnerID=tZOtx3y1}, author = {Prada, M. and Sallar{\`e}s, V. and Ranero, C. R. and Vendrell, M. G. and Grevemeyer, I. and Zitellini, N. and de Franco, R.} } @booklet {Ranero2014, title = {{The Western Mediterranean Pairs of Basin and Arc Systems}}, year = {2014}, month = {feb}, publisher = {Sociedad Geol{\'o}gica de Espa{\~n}a}, abstract = {Ranero, C{\'e}sar R. ... et. al.{\textendash} VIII Congreso Geol{\'o}gico de Espa{\~n}a, 2012, Oviedo}, isbn = {http://hdl.handle.net/10261/92021}, url = {http://digital.csic.es/handle/10261/92021}, author = {Ranero, Cesar R. and Gr{\'a}cia, Eul{\`a}lia and Sallares, Valenti and Garcia, Xavier and Gallart Muset, Josep and Bartolom{\'e}, Rafael and Lo Iacono, Claudio and Martinez-Loriente, S. and Moreno, Ximena and Prada, Manel and Perea, Hector and Zitellini, N.} } @article {Moeller2013, title = {{Early-stage rifting of the northern Tyrrhenian Sea Basin: Results from a combined wide-angle and multichannel seismic study}}, journal = {Geochemistry, Geophysics, Geosystems}, volume = {14}, number = {8}, year = {2013}, month = {aug}, pages = {3032{\textendash}3052}, abstract = {Extension of the continental lithosphere leads to the formation of rift basins and ultimately may create passive continental margins. The mechanisms that operate during the early stage of crustal extension are still intensely debated. We present the results from coincident multichannel seismic and wide-angle seismic profiles that transect across the northern Tyrrhenian Sea Basin. The profiles cross the Corsica Basin (France) to the Latium Margin (Italy) where the early-rift stage of the basin is well preserved. We found two domains, each with a distinct tectonic style, heat flow and crustal thickness. One domain is the Corsica Basin in the west that formed before the main rift phase of the northern Tyrrhenian Sea opening (\~{}8-4 Ma). The second domain is rifted continental crust characterized by tilted blocks and half-graben structures in the central region and at the Latium Margin. These two domains are separated by a deep (\~{}10 km) sedimentary complex of the eastern portion of the Corsica Basin. Travel-time tomography of wide-angle seismic data reveals the crustal architecture and a subhorizontal 15-17 {\textpm} 1 km deep Moho discontinuity under the basin. To estimate the amount of horizontal extension we have identified the pre-, syn-, and post-tectonic sedimentary units and calculated the relative displacement of faults. We found that major faults initiated at angles of 45{\textdegree}-50{\textdegree} and that the rifted domain is horizontally stretched by a factor of $\beta$ \~{} 1.3 (\~{}8-10 mm/a). The crust has been thinned from \~{}24 to \~{}17 km indicating a similar amount of extension (\~{}30\%). The transect represents one of the best imaged early rifts and implies that the formation of crustal-scale detachments, or long-lived low-angle normal faults, is not a general feature that controls the rift initiation of continental crust. Other young rift basins, like the Gulf of Corinth, the Suez Rift or Lake Baikal, display features resembling the northern Tyrrhenian Basin, suggesting that half-graben formations and distributed homogeneous crustal thinning are a common feature during rift initiation. {\textcopyright}2013. American Geophysical Union. All Rights Reserved.}, keywords = {Basin formation, Continental extension, Multichannel seismic data, Rifting, Tyrrhenian Sea, Wide-Angle data}, issn = {15252027}, doi = {10.1002/ggge.20180}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84885100133\&partnerID=tZOtx3y1}, author = {Moeller, S. and Grevemeyer, I. and Ranero, C. R. and Berndt, C. and Klaeschen, D. and Sallar{\`e}s, V. and Zitellini, N. and de Franco, R.} } @booklet {Martinez-Loriente2013a, title = {{Pre-stack depth migration seismic imaging of the Coral Patch Ridge and adjacent Horseshoe and Seine Abyssal Plains (Gulf of Cadiz): tectonic implications}}, year = {2013}, month = {apr}, publisher = {Universidad de Oviedo}, abstract = {Peer Reviewed}, url = {http://digital.csic.es/handle/10261/75234}, author = {Martinez-Loriente, S. and Gr{\'a}cia, Eul{\`a}lia and Bartolom{\'e}, Rafael and Klaeschen, D. and Vizcaino, A. and Sallares, Valenti and Da{\~n}obeitia, Juan Jos{\'e} and Zitellini, N.} } @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.} } @conference {Ranero2012, title = {{The tectonic structure of the Tyrrhenian Basin, a complex interaction among faulting and magmatism}}, booktitle = {Rendiconti Online Societa Geologica Italiana}, volume = {21}, number = {PART 1}, year = {2012}, pages = {251{\textendash}252}, keywords = {Crustal structure, Tectonic structure, Tyrrhenian rifting}, issn = {20358008}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84872362909\&partnerID=tZOtx3y1}, author = {Ranero, C. R. and Sallar{\`e}s, V. and Zitellini, N. and Grevemeyer, I. and Guzman, M. and Prada, M. and Moeller, S. and de Franco, R.} } @article {Geissler2010, title = {{Focal mechanisms for sub-crustal earthquakes in the Gulf of Cadiz from a dense OBS deployment}}, journal = {Geophysical Research Letters}, volume = {37}, number = {18}, year = {2010}, month = {sep}, pages = {n/a{\textendash}n/a}, abstract = {An eleven-month deployment of 25 ocean bottom seismometers provides an unprecedented opportunity to study low-magnitude local earthquakes in the complex transpressive plate boundary setting of the Gulf of Cadiz, known for the 1755 Lisbon earthquake and tsunami. 36 relocated earthquakes (ML 2.2 to 4.8) concentrate at 40-60 km depth, near the base of the seismogenic layer in \~{}140 Ma old oceanic mantle lithosphere, and roughly align along two perpendicular, NNE-SSW and WNW-ESE striking structures. First motion focal mechanisms indicate compressive stress for the cluster close to the northern Horseshoe fault termination which trends perpendicular to plate convergence. Focal mechanisms for the second cluster near the southern termination of the Horseshoe fault indicate a strike-slip regime, providing evidence for present-day activity of a dextral shear zone proposed to represent the Eurasia-Africa plate contact. We hypothesize that regional tectonics is characterized by slip partitioning. {\textcopyright} 2010 by the American Geophysical Union.}, issn = {00948276}, doi = {10.1029/2010GL044289}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77957722745\&partnerID=tZOtx3y1}, author = {Geissler, W. H. and Matias, L. and Stich, D. and Carrilho, F. and Jokat, W. and Monna, S. and IbenBrahim, A. and Mancilla, F. and Gutscher, M.-A. and Sallar{\`e}s, V. and Zitellini, N.} } @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.} }