Person:
Córdoba Barba, Diego

Profile Picture
First Name
Diego
Last Name
Córdoba Barba
URI
https://hdl.handle.net/20.500.14352/75149
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Física de la Tierra y Astrofísica
Area
Física de la Tierra
Identifiers
UCM identifierORCIDScopus Author IDWeb of Science ResearcherIDDialnet ID

Filters

1998 - 199912000 - 20085
Reset filters

Settings

End date: 2009 × Item Type: Publication ×

Search Results

Now showing 1 - 6 of 6
  • Thumbnail Image
    Item
    Survey explores active tectonics in Northeastern Caribbean
    (Eos, Transactions American Geophysical Union, 2005) Carbó Gorosabel, Andrés; Córdoba Barba, Diego; Martín Dávila, José; Ten Brink, Uri S.; Herranz Araújo, Pedro; Von Hilldebrant, Christa; Payero, Juan; Muñoz Martín, Alfonso; Pazos, Antonio; Catalán, Manuel; Granja Bruña, José Luis; Gómez Ballesteros, María
    There is renewed interest in studying the active and complex northeastern Caribbean plate boundary to better understand subduction zone processes and for earthquake and tsunami hazard assessments [e.g., ten Brink and Lin, 2004; ten Brink et al., 2004; Grindlay et al, 2005]. To study the active tectonics of this plate boundary, the GEOPRICO-DO (Geological, Puerto Rico-Dominican) marine geophysical cruise, carried out between 28 March and 17 April 2005 (Figure 1), studied the active tectonics of this plate boundary. Initial findings from the cruise have revealed a large underwater landslide, and active faults on the seafloor (Figures 2a and 2c). These findings indicate that the islands within this region face a high risk from tsunami hazards, and that local governments should be alerted in order to develop and coordinate possible mitigation strategies. The cruise collected multibeam bathymetry, gravity, magnetic, high-resolution seismic, deep seismic sounding, and multichannel seismic reflection data, which are currently being processed and interpreted (Table 1). In early November 2005, 10 ocean-bottom seismometers (OBS) that had been deployed northeast of Puerto Rico and the Virgin Islands (Figure 1) during the cruise were recovered. These OBS recorded data during the cruise and the local seismicity between April and October 2005.
  • Thumbnail Image
    Item
    Seismic crustal structure in the southwest of the Iberian Peninsula and the Gulf of Cadiz
    (Tectonophysics, 1998) González Fernández, Antonio; Córdoba Barba, Diego; Vegas, Ramón; Matías, Luis Manuel
    The crust under the southwestern Iberian Peninsula and the Gulf of Cadiz has been sampled by 1200 km of deep seismic refraction=wide-angle reflection profiles, together with many seismic reflection lines and bore-holes. Wide-angle seismic data were collected during the last three decades. Commercial multichannel data provide a detailed image of the uppermost crust, improving the confidence about the models of the deeper structures. P-wave velocities within the thick column of sediments in the Gulf of Cadiz range from 2.0 to 3.8 km=s, while the Algarve and the Sines areas have higher velocities of 4.3 to 4.8 km=s. The top of the Palaeozoic basement rises to the northwest, outcropping in the South Portuguese zone of the Iberian Massif, and is characterized by P-wave velocities of 5.7–5.9 km=s. High velocities of 6.4 km=s have been found at shallow depths of 7 to 10 km in the South Portuguese zone, that could be related to the mafic and ultramafic rocks in the Beja-Acebuches zone. Lower crustal velocities are in the range of 6.7–6.9 km=s. The crustal thickness shows important lateral changes from 29 km beneath the Guadalquivir Basin=Iberian Massif contact to 35 km in the southeastern part of the South Portuguese zone. From the interpretation of these seismic data, a geodynamic model of the evolution of the crust in Southwestern Iberia and the Gulf of Cadiz is proposed. The Guadalquivir Basin, and its continuation at sea, the Gulf of Cadiz, is a flexure area of the crust that could be related to the overloading due to the overthrusting of the Alboran Domain over the Iberian plate.
  • Thumbnail Image
    Item
    Adelgazamiento de la corteza en el margen septentrional del Golfo de Cádiz
    (Geotemas, 2004) Medialdea Cela, Teresa; Córdoba Barba, Diego; Vegas, Ramón; Dañobeitia, J.J.
    Refraction/wide angle seismic profiles acquired in 2000 during the Parsifal cruise across the Southportuguese Zone, the Algarve Basin and the South Iberian continental margin have allowed us to determine the crustal structure west of the Bank of Guadalquivir, which has been constrained by gravity modelling. According to the crustal model obtained, a crustal thinning of 11 km takes place from the shoreline to the Guadalquivir Bank area, where enhanced crustal attenuation has been found. Under the sedimentary cover, the velocity structure consists of a wedge-shaped upper crust with velocities between 5.8 and 5.9 km/s, characterised by a pronounced thickness variation. In the middle-lower crust, velocity increases from 6 to 7 km/s.
  • Thumbnail Image
    Item
    IBERARRAY: La componente sísmica del proyecto TopoIberia
    (Geotemas, 2008) Morales Soto, José; Pazos, Antonio; García Lobón, J.L.; Córdoba Barba, Diego; Álvarez Pulgar, Francisco Javier; Carbonell Beltrán, Ramón; Villaseñor Rodríguez, Isabel; Díaz Cusí, Jordi; Gaite Castrillo, Beatriz; Gallart Muset, Josep
    Iberarray, componente sísmica del proyecto TopoIberia, está formada por una red densa de estaciones sísmicas de banda ancha y alta resolución a semejanza del USarray del proyecto Earthscope. Los objetivos que se persiguen con la instalación de Iberarray es estudiar la relación que existe entre los procesos que tienen lugar a escala litosférica y en la corteza de la península Ibérica, mar de Alborán y norte de Marruecos. Esta red está dedicada fundamentalmente a generar una base de datos de formas de onda con una resolución sin precedentes en una zona de especial interés geodinámico como es la región del contacto de placas continentales de Eurasia y Africa. Esta red está ya instalada en su primera fase, hasta 38.5º de Latitud, conformando una malla de 50x50 km entre estaciones. Iberarray está constituida por 50 estaciones de banda ancha más las aportaciones de las redes permanentes en la zona (IAG-UGR,ROA) y las redes portátiles del IAG-UGR y del ICT-CSIC. Iberarray es el brazo sísmico del proyecto multidisciplinar TopoIberia.
  • Thumbnail Image
    Item
    Estudio sísmico de la corteza superior en Isla Decepción (Antártida)
    (Geotemas, 2004) Agudo, I.M.; Córdoba Barba, Diego; Dávila, J.M.; Pazos, A.
    In this work, results from 4 refraction/wide angle seismic profiles, acquired in 2002 during the GEODEC-MAR cruise across Deception Island volcanic interior; have allowed us to determine the upper crustal structure. According to P-wave velocity-depth model obtained, a four layer structure have been observed. The first and the second layers correspond to the sedimentary cover (1.8-2.8 and 3.5-3.6 km s'1 respectively). The third one is interpreted as the crystalline basement (4.0-4.9 km s'1). The fourth layer is separated in two zones which indicate two types of crust: type 1-5.5 km s type 11-6.0 km s'1, the contact between both zones could be related with a fracture zone across Deception Island.
  • Thumbnail Image
    Item
    Structure and evolution of the ‘‘Olistostrome’’ complex of the Gibraltar Arc in the Gulf of Cádiz (eastern Central Atlantic): evidence from two long seismic cross-sections
    (Marine geology, 2004) Medialdea Cela, Teresa; Vegas, Ramón; Somoza Losada, Luis; Vázquez Garrido, Juan Tomás; Maldonado López, Andrés; Díaz del Río Español, Víctor; Maestro González, Adolfo; Córdoba Barba, Diego; Fernández Puga, Mª Carmen
    Reflection profiles characterize the structure and the upper Mesozoic to Cenozoic deposits of the Gulf of Ca´diz region. Two long ENE–WSW multichannel seismic lines (ca. 400–500 km long) are analyzed to study the evolution of the area from the continental shelf to the Horseshoe and Seine abyssal plains. The huge allochthonous deposits emplaced in this region (the socalled ‘‘Olistostrome’’ of the Gulf of Cadiz) are described in terms of three different domains on the basis of the seismic architecture, the main tectonic features and the nature of the basement, oceanic or continental. The eastern domain extends along the continental shelf and upper and middle slope and corresponds to the offshore extension of the Betic–Rifean external front. It is characterized by salt and shale nappes later affected by extensional collapses. The central domain develops along the lower slope between the Betic–Rifean front and the abyssal plains and is characterized by a change in dip of the allochthonous basal surface and the basement. The allochthonous masses were emplaced by a combined gravitational and tectonic mechanism. The northern boundary of this domain is marked by the occurrence of an outstanding WNW–ESE-trending thrust fault with a strike-slip component, termed here as the Gorringe–Horseshoe fault. The westernmost domain corresponds to the abyssal plains, where the distal emplacement of the allochthonous body takes place; it is characterized by thrust faults affecting both the sedimentary cover and the oceanic basement. The allochthonous masses show a less chaotic character and the thickness decreases notably. These domains represent different evolutionary steps in the mechanisms of emplacement of the allochthonous units. The eastern domain of the allochthonous units was emplaced as part of the pre-Messinian orogenic wedge related to the collision that gave rise to the Betic–Rifean Belt, whereas the allochthonous wedge of the central and western domains were emplaced later as a consequence of the NE–SW late Miocene compression that continues in present times.