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Garate J.,Real Instituto Observatorio Armada | Martin-Davila J.,Real Instituto Observatorio Armada | Khazaradze G.,University of Barcelona | Echeverria A.,University of Barcelona | And 13 more authors.
GPS Solutions | Year: 2015

A new continuous GPS network was installed under the umbrella of a research project called “Geociencias en Iberia: Estudios integrados de topografía y evolución 4D (Topo-Iberia)”, to improve understanding of kinematic behavior of the Iberian Peninsula region. Here we present a velocity field based on the analysis of the 4 years of data from 25 stations constituting the network, which were analyzed by three different analysis groups contributing to the project. Different geodetic software packages (GIPSY–OASIS, Bernese and GAMIT) as well as different approaches were used to estimate rates of present day crustal deformation in the Iberian Peninsula and Morocco. In order to ensure the consistency of the velocity fields determined by the three groups, the velocities obtained by each analysis center were transformed into a common Eurasia Reference Frame. After that, the strain rate field was calculated. The results put in evidence more prominent residual motions in Morocco and southernmost part of the Iberian Peninsula. In particular, the dilatation and shear strain rates reach their maximum values in the Central Betics and northern Alboran Sea. A small region of high shear strain rate is observed in the east-central part of the peninsula and another deformation focus is located around the Strait of Gibraltar and the Gulf of Cadiz. © 2014, Springer-Verlag Berlin Heidelberg.

Vila B.,Autonomous University of Barcelona | Galobart T.,Autonomous University of Barcelona | Oms O.,Autonomous University of Barcelona | Poza B.,Consorci Ruta Minera | Bravo A.M.,Instituto Geologico Minero Of Espana
Lethaia | Year: 2010

Detailed mapping and excavation at the egg locality of Font del Bullidor (Vallcebre Syncline, NE Iberian Peninsula) document various clutches with megaloolithid (Megaloolithus siruguei) eggs and provide significant information on the mode of incubation of Late Cretaceous titanosaurs. Clutches of eggs are preserved in a greyish lagoonal mudstone deposited overlying a sinuous channel infill. Despite the lithological uniformity of the mudstone, clutch architecture can be inferred from the topographical position of the eggs within some clutches. Mapping methods underscore the importance of documenting the spatial relationship of the egg-bearing bed and the mapping plan, as well as an accurate 3-D coordinate acquisition. Both geometry of the clutches and taphonomic observations on particular eggs indicate that eggs were laid in a shallow pit excavated into the substrate. Most of the eggs were incubated under a cover of sediment before hatching or cracking. This corroborates previous inferences on nesting mode. □ Clutch, dinosaurs, eggs, Maastrichtian, Megaloolithus siruguei, Pyrenees. © 2009 The Authors, Journal compilation © 2009 The Lethaia Foundation.

Abrahao R.,University of Zaragoza | Sarasa J.,University of Zaragoza | Causape J.,Instituto Geologico Minero Of Espana | Garcia-Garizabal I.,University of Zaragoza | Ovelleiro J.L.,University of Zaragoza
Spanish Journal of Agricultural Research | Year: 2011

In order to understand the several possible environmental impacts caused by irrigation, the existence of a study area under transition from unirrigated to irrigated land is a great advantage. This work investigates the presence of 44 pesticides and metabolites, 11 organochlorinated compounds, 17 polycyclic aromatic hydrocarbons (PAHs), 13 polychlorinated biphenyls (PCBs), and several metals and metalloids such as Cd, Cr, Cu, Ni, Pb, Zn, As, Se and Hg, in the soil, water and sediments of an agrarian basin in Northeast Spain. The study area was unirrigated until 2006, when irrigation began. The objective of this work was to verify if the first irrigation years influenced the concentrations of the substances and elements analyzed. The main contaminants detected were organochlorinated compounds, PAHs and metals in the soil; atrazine, desethylatrazine, terbuthylazine, dicofol and pp'-DDT in the water; and PAHs, 1, 2, 4 trichlorobenzene and metals in the sediments. Until the conclusion of this study, no serious contamination issues existed related to the analyzed substances, and for the moment, irrigation has not significantly influenced the concentrations of such substances in the basin. Nevertheless, slightly elevated punctual values were observed for endrinin the soil, pp'-DDT in the water, and Ni and Zn in the sediments.

Palomino D.,C.O. de Malaga | Vazquez J.-T.,C.O. de Malaga | Somoza L.,Instituto Geologico Minero Of Espana | Leon R.,Instituto Geologico Minero Of Espana | And 5 more authors.
Geomorphology | Year: 2016

The margin of the continental slope of the Volcanic Province of Canary Islands is characterised by seamounts, submarine hills and large landslides. The seabed morphology including detailed morphology of the seamounts and hills was analysed using multibeam bathymetry and backscatter data, and very high resolution seismic profiles. Some of the elevation data are reported here for the first time. The shape and distribution of characteristics features such as volcanic cones, ridges, slides scars, gullies and channels indicate evolutionary differences. Special attention was paid to recent geological processes that influenced the seamounts. We defined various morpho-sedimentary units, which are mainly due to massive slope instability that disrupt the pelagic sedimentary cover. We also studied other processes such as the role of deep bottom currents in determining sediment distribution. The sediments are interpreted as the result of a complex mixture of material derived from a) slope failures on seamounts and submarine hills; and b) slides and slumps on the continental slope. © 2015 Elsevier B.V.

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