Person:
Giner Robles, Jorge Luis

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First Name
Jorge Luis
Last Name
Giner Robles
URI
https://hdl.handle.net/20.500.14352/81990
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Area
Geodinámica Interna
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1996 - 199912000 - 20089
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Author: González Casado, José Manuel × Has files: true ×

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    Caracterización geoeléctrica de los depósitos superficiales en la Antártida Occidental (Isla Livingstone, Islas Shetland del Sur, Antártida Occidental)
    (Geogaceta, 2000) Muñoz Martín, Alfonso; Giner Robles, Jorge Luis; González Casado, José Manuel; López Martínez, Jerónimo; Durán Valsero, Juan José; Gumiel, Pablo; Serrano, Enrique
    The geophysical study of superficial deposits (mainly gravels) in ice-free areas near the seashore in the South Shetland Islands (Antarctica) allows establishing the possible existence of permafrost and buried ice bodies. In this work we have investigated the internal structure of Quaternary sediments using the resistivity method (vertical electric sounding, V.E.S.), with the purpose of establishing the resistivity values of the different materials and their geometry. We present here the results obtained from 17 vertical electric soundings carried out in Caleta Española, (north coast of Hurd Peninsula), and in the surroundings of Caleta del Glaciar Rocoso (south coast of Hurd Peninsula), both in Livingston Island. Vertical electric soundings interpretation has allowed us to characterise different units from the resistivity values (active layer, permafrost, buried ice, Quaternary deposits and their basement), and to establish the inter-phase between sea water and continental water. Moreover, with the resistivity method we have deduced the spatial distribution of some of these beds. In this way the permafrost (with resistivity values ranging between 13000 and 35000 Ω*m), and the associated active layer, is restrained to shallow depths(< 2 m) and located in the surveyed areas faraway from the seaside (i.e. mainly in the upper raised beaches). Buried ice under coarse Quaternary deposits have resistivity values of one major order magnitude than the permafrost (> 60000 Ω *m) and has been only found in the studied rock glacier.
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    Geometrie analysis and scaling properties of calcite e-twins in the Cameros Basin (NW Iberian Chain, Spain)
    (Geotemas, 2004) Gumiel, Pablo; González Casado, José Manuel; Campos, R.; Giner Robles, Jorge Luis; García Cuevas, C.
    One dimensional geometric analysis has been carried out in several scan lines from 885 measures of twins in calcite grains to determine grain width (in microns) and twin density (number of twins.mm-1 ) distributions. Grain width and twin density have a good fit to the log-normal frequency distribution. Twinning in calcite implies intracrystaline deformation mechanism with low shear stress. When the process begins low grain width and calcite twins are developed with a probably random distribution what could be supported by a negative exponential distribution tendency. The twinning process continues until a "critical" value of grain width and density which is going to influence in the scaling process, and becoming the distribution to log-normal type. But some data also conform to a power-law (fractal) frequency distribution from determined range or sizes (300 to WOO mm) and density (2 to W twins.mm-1) with some superimposed random (negative-exponential) elements, possible due to the irregularities at grain scale, but also because this systems show multifractal behavior.
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    Determinación de valores absolutos de paleoesfuerzos, basados en el maclado de la calcita, en el frente norte de la Sierra de Cameros (Cordillera Ibérica).
    (Geotemas, 2004) González Casado, José Manuel; García Cuevas, C.; Gumiel, Pablo; Giner Robles, Jorge Luis; Moreno, A.
    Calcite e-twin density (twins/mm) and percentage of calcite grains with one and two twin sets from sparry grains that fill microveins were used to precise the differential stress related with the inversion of the Cameros Basin, a Mesozoic sedimentary basin located in the northwestern part of Iberian Chain (Spain). The results obtained using techniques based on the percentage of twined grains yield better results that those techniques based on twin density. The deduced stress magnitudes fit well with the differential stress interval proposed for fold-thrust belt domains. Combination of twin data with rock mechanics data provides adequate estimations of differential stresses.
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    Determination of present-day stress tensor and neotectonic interval in the Spanish Central System and Madrid Basin, central Spain
    (Tectonophysics, 1996) Vicente Muñoz, Gerardo de; Giner Robles, Jorge Luis; Muñoz Martín, Alfonso; González Casado, José Manuel; Lindo, Rubén
    A brittle deformation tectonic analysis was performed in central Spain (Spanish Central System and Madrid Basin) in order to decipher and understand the deformation processes that take place in a typical intracontinental zone. 1174 fault slickensides obtained in materials with ages between Late Cretaceous and Quaternary have been analyzed by means of fault population analysis methods to reconstruct paleostress tensors. Nine earthquake focal mechanisms have been determined, with magnitudes ranging between 3 and 4.1. With regard to regional structural features and sedimentary record data, the characteristics of present-day and neotectonic stress fields have been figured out, which determine the neotectonic period for this region. Thus, we have established that the intraplate zone represented by central Spain has been subjected to a stress field from the Middle Miocene until the present-day with a largest horizontal shortening direction (SHMAX) located between N130E and N160E. Finally, three paleostress maps with the main active structures are presented for: (a) Middle Miocene to Late Miocene, the period when the Spanish Central System was mainly formed, (b) Late Miocene to Quaternary, and (c) the present-day stress field, deduced from earthquake focal mechanisms.
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    The recent (upper Miocene to Quaternary) and present tectonic stress distributions in the Iberian Peninsula
    (Tectonics, 2000) Herraiz, Miguel; Vicente Muñoz, Gerardo de; Lindo, Rubén; Giner Robles, Jorge Luis; Simón, José Luis; González Casado, José Manuel; Vadillo, O.; Rodríguez Pascua, Miguel Angel; Cicuendez, J.I; Casas, Antonio; Cabañas, Luis; Rincón Calero, Pedro José; Cortes, L.; Ramírez, Mª Sol; Licini, Manuel
    A general synthesis of the recent and present stress situation and evolution in the Iberian Peninsula was obtained from microstructural and seismological analysis. The stress evolution was deduced from (1) fault population analysis (FPA) from 409 sites distributed throughout the Iberian Peninsula, (2) paleostress indicators given by 324 stations taken from the bibliography, and (3) seismic data corresponding to 161 focal mechanisms evenly spread in the studied region. The application of FPA together with the determination of stress tensors and focal mechanisms for the whole Iberian microplate has provided two main results: (1) the Iberian Peninsula is undergoing a NW-SE oriented compression, except for the northeastern part Pyrenees,Ebro Basin, and Iberian Chain), where it is N-S to NE-SW, and the Gulf of Cadiz, where it seems to be E-W, and (2) the main trends of the stress field have remained almost constant since the upper Miocene. The analysis performed by zones suggests the presence of local heterogeneities in the stress field.
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    Relaciones entre fallas y sismicidad en el noroeste peninsular
    (Geogaceta, 2000) González Casado, José Manuel; Giner Robles, Jorge Luis
    The statistical study of the post-hercynian cartographic faults of the Northwest part of Spain (Galicia) allow to precise the existence of three main fault sets; NE-SW, NW-SE and N-S, which controlled the topograpic features in this area. The seismic epicentres in this region are related mainly with the NE-SW and N-S fault sets, which are, probably, the seismogenetic faults. The orientation of the stresses responsible for the seismic activity been deduced from the analyses of 76 earthquake focal mechanisms. The maximum horizontal compression direction is located NW-SE, then the NE-SW faults move as reverse faults, the NW-SE set as normal faults and the N-S as normal-oblique faults (sinistral).
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    Determinación del campo de esfuerzo/deformación activo en una isla volcánica a partir de técnicas fractales y estructurales (Isla Decepción, Antártida Occidental)
    (Geotemas, 2008) Pérez López, Raúl; Giner Robles, Jorge Luis; Bejar Pizarro, Marta; Rodríguez Pascua, Miguel Angel; Martínez Díaz, José Jesús; Paredes, C.; González Casado, José Manuel
    En este trabajo se obtiene el campo de esfuerzo y deformación activo en la isla volcánica de Decepción, en la Antártida Occidental. Para ello, se han aplicado tres técnicas estructurales diferentes: (1) medida de planos de falla con vector de deslizamiento, (2) estudio de la geometría fractal de la distribución espacial de lineamientos en la isla, interpretados a partir de imágenes satélite y MDT de alta resolución y (3) cartografía y geometría de la caldera volcánica. El campo de deformación obtenido es de tipo extensional con dos orientaciones ortogonales para el máximo acortamiento horizontal (ey), NE-SO y NO-SE. El campo de esfuerzos obtenido mediante el análisis fractal y de la geometría de la caldera volcánica se define a partir de SHMAX según NE-SO.
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    Modelo cinemático actual de la Placa Caribe en la confluencia con la Placa Norteamericana y la Placa de Cocos
    (Geotemas, 2008) Giner Robles, Jorge Luis; Pérez López, Raúl; Martínez Díaz, José Jesús; Rodríguez Pascua, Miguel Angel; González Casado, José Manuel
    Este trabajo propone un modelo cinemático en la zona más occidental de la Placa Caribe, en los límites con la Placa Norteamericana y la Placa de Cocos. Para ello se ha realizado un análisis cluster de la sismicidad presente en la zona en función de: 1) su distribución espacial y 2) de la dirección de máximo acortamiento horizontal (ey), obtenidas del análisis de las construcciones de sus mecanismos focales mediante métodos de análisis poblacional de fallas. En total, se han considerado 57 de los 488 sismos con construcción del mecanismo focal situados en la zona. Los resultados obtenidos, tanto de los tensores, como de las trayectorias de deformación sugieren un modelo caracterizado por la rotación de ey en los límites de esta placa con la Placa Norteamérica y en la zona del Arco Volcánico Centroamericano. Esta rotación es congruente con un movimiento lateral hacia el ESE del área más occidental de la Placa Caribe, produciendo una extensión asociada a este movimiento en la zona central del Bloque de Chortis. Este modelo corrobora la existencia de un bloque tectónico costero en la Placa Caribe independiente del Bloque de Chortis (Forearc Sliver).
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    Protocolo de análisis tectónico estructural para la caracterización de potenciales almacenamientos geológicos de CO2
    (Geotemas, 2008) Giner Robles, Jorge Luis; Pérez López, Raúl; Martínez Díaz, José Jesús; Rodríguez Pascua, Miguel Angel; Perucha, M.A.; Paredes, C.; Vega, R. de la; Campos Egea, Rocío; Arenillas González, A.; Suárez, Ignacio; Sastre Martínez, Javier; González Casado, José Manuel
    En el contexto del proyecto TECTO2 (CGL2006-28134-E/CLI) se está realizando un protocolo de análisis tectónico estructural para la caracterización de almacenamientos geológicos de CO2. Este protocolo surge de la necesidad de estructurar y caracterizar una serie de metodologías que permitan cuantificar diferentes variables de carácter tectónico-estructural, de forma que se pueda establecer la idoneidad de una zona para el emplazamiento de un almacenamiento geológico de CO2. Este protocolo se pretende definir unos parámetros tectónico-estructurales a partir de: 1) el establecimiento de tres escalas de análisis, 2) la definición de los factores y variables que deben ser cuantificados en cada una de las escalas de análisis, y por último, 3) en las diferentes metodologías necesarias para cuantificar esas variables. Para cada una de las escalas de trabajo, el protocolo TECTO2 describe la secuencia de aplicación de las metodologías necesarias para cuantificar las variables adecuadas para la correcta caracterización tectónico-estructural de un almacenamiento geológico de CO2, aplicables también para el posterior seguimiento y control del emplazamiento.
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    Actividad de una falla asociada a la erupción volcánica de la Isla Decepción en 1970 (Antártida Occidental): la Falla de María
    (Geotemas, 2008) Pérez López, Raúl; Rodríguez Pascua, M.A.; Bejar Pizarro, Marta; Martínez Díaz, José Jesús; Giner Robles, Jorge Luis; Silva Barroso, Pablo Gabriel; González Casado, José Manuel
    Este trabajo analiza la formación de un escarpe de falla asociado a la erupción freatomagmática que ocurrió en 1970 en la Isla Decepción (Antártida Occidental). El hecho de tener información de fotografías aéreas previas a su desarrollo (1968) y una imagen de satélite de alta resolución (2003) permite establecer la formación de dicho escarpe, la evolución de la red de drenaje y la presencia de terrazas fluviales levantadas. A partir de esta información, llevamos a cabo una campaña de campo durante el verano austral de 2007, con el fin de realizar una serie de trincheras a lo largo del escarpe. De toda la información expuesta, se constata un movimiento de componente inverso a lo largo de la falla con 1 km de ruptura superficial y 20 cm de salto, afectando a los depósitos piroclásticos de la erupción de 1970. Tres modelos podrían explicar dicha actividad: (1) Terremoto inverso de tamaño pequeño-moderado (5