@article{fdi:010090931,
  title = {{T}he {G}ibraltar subduction : a decade of new geophysical data},
  author = {{G}utscher, {M}.{A}. and {D}ominguez, {S}. and {W}estbrook, {G}.{K}. and {L}e {R}oy, {P}. and {R}osas, {F}. and {D}uarte, {J}.{C}. and {T}errinha, {P}. and {M}iranda, {J}.{M}. and {G}raindorge, {D}. and {G}ailler, {A}. and {S}allares, {V}alenti and {B}artolome, {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {G}ibraltar arc, spans a complex portion of the {A}frica-{E}urasia plate boundary marked by slow oblique convergence and intermediate and deep focus seismicity. {T}he 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). {G}eophysical data acquired in the past decade provide a test for these models and support a narrow east-dipping, subduction zone. {S}eismic refraction studies indicate oceanic crust below the western {G}ulf of {C}adiz. {T}omography of the upper mantle reveals a steep, east-dipping high {P}-wave velocity body, beneath {G}ibraltar. {T}he anisotropic mantle fabric from {SKS} splitting shows arc-parallel 'fast directions', consistent with toroidal flow around a narrow, westward retreating subducting slab. {T}he accompanying {WSW} advance of the {R}if-{B}etic mountain belt has constructed a thick pile of deformed sediments, an accretionary wedge, characterized by west-vergent thrust anticlines. {B}athymetric swath-mapping images an asymmetric embayment at the deformation front where a 2 km high basement ridge has collided. {S}ubduction has slowed significantly since 5 {M}a, but deformation of recent sediments and abundant mud volcanoes suggest ongoing activity in the accretionary wedge. {T}hree possible origins for this deformation are discussed; gravitational spreading, overall {NW}-{SE} convergence between {A}frica and {I}beria and finally a {WSW} tectonic push from slow, but ongoing roll-back subduction. {I}n 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. {C}ontinued activity of the subduction offers a possible explanation for great ({M} > 8.5) earthquakes known to affect the area, like the famous 1755 {G}reat {L}isbon earthquake. {R}ecent {GPS} studies show {SW} motion of stations in {N} {M}orocco at velocities of 3-6 mm/yr indicating the presence of an independent block, a '{R}if-{B}etic-{A}lboran' microplate, situated between {I}beria and {A}frica.},
  keywords = {{ATLANTIQUE} ; {ALBORAN} {MER} ; {CADIX} {GOLFE}},
  booktitle = {},
  journal = {{T}ectonophysics},
  volume = {574-575},
  numero = {},
  pages = {72--91},
  ISSN = {0040-1951},
  year = {2012},
  DOI = {10.1016/j.tecto.2012.08.038},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090931},
}