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Active faulting in the mesozoic oceanic lithosphere offshore the SW Iberian Margin. Significance for earthquake and tsunami hazard

Other TitlesFallas activas en la litosfera oceánica mesozoica offshore del Margen SO Ibérico. Significado para el riesgo de terremotos y tsunamis
AuthorsMartínez-Loriente, S. ; Gràcia, Eulàlia ; Bartolomé, Rafael ; Sallarès, Valentí ; Perea, Héctor
KeywordsMultichannel seismic
Blind thrusts
Strike-slip faults
Iberia-Africa boundary
Issue DateOct-2014
CitationIberfault 2014 : Una aproximación multidisciplinar al estudio de las fallas activas, los terremotos y el riesgo sísmico : Segunda Reunión Ibérica sobre Fallas Activas y Paleosismología : Volumen de resúmenes: 81-84 (2014)
AbstractNewly acquired high-resolution multichannel seismic profiles together with bathymetric and subbottom profiler data from the external part of the Gulf of Cadiz (Iberia-Africa plate boundary) reveal active deformation involving old (Mesozoic) oceanic lithosphere. This area is located 180 km offshore the SW Iberian Margin and embraces the prominent NE-SW trending Coral Patch Ridge, and part of the surrounding deep Horseshoe and Seine abyssal plains. E-W trending dextral strike-slip faults showing surface deformation of flower-like structures predominate in the Horseshoe Abyssal Plain, whereas NE-SW trending compressive structures prevail in the Coral Patch Ridge and Seine Hills. Although the Coral Patch Ridge region is characterized by subdued seismic activity, the area is not free from seismic hazard. Most of the newly mapped faults correspond to active blind thrusts and strike-slip faults that are able to generate large magnitude earthquakes (Mw 7.2–8.4). This may represent a significant earthquake and tsunami hazard that has been overlooked so far
DescriptionInciativa Ibérica para el Estudio de las Fallas Activas, Segunda Reunión Ibérica sobre Fallas Activas y PaleosismologíaI IBERFAULT 2014, 22-24 de octubre de 2014, Lorca, España.-- 4 pages, 2 figures
Publisher version (URL)http://www.iberfault.org/index.php/es/
Appears in Collections:(ICM) Libros y partes de libros
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