Person: Giner Robles, Jorge Luis
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First Name
Jorge Luis
Last Name
Giner Robles
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Area
Geodinámica Interna
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15 results
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Item Informe geológico preliminar del terremoto de Lorca del 11 de mayo del año 2011, 5.1 Mw(2011) Martínez Díaz, José Jesús; Rodríguez-Pascua, Miguel Ángel; Pérez López, Raúl; García Mayordomo, Julián; Giner Robles, Jorge Luis; Martín-González, Fidel; Rodríguez Peces, Martín Jesús; Álvarez Gómez, José Antonio; Insua Arévalo, Juan MiguelItem Colapsos cosísmicos y paleosismicidad en la sima de Benis (Cieza, SE España), asociados al terremoto de Mula (1999; VII mks; Mb = 4,8)(Contribuciones al estudio del periodo cuaternario, 2007) Pérez López, Raúl; Martínez Díaz, José Jesús; Rodríguez Pascua, Miguel Angel; Silva Barroso, Pablo Gabriel; Giner Robles, Jorge Luis; Bejar Pizarro, Marta; Marcos Nuez, A.; Calvo Sorando, José Pedro; Lario Gómez, Javier; Silva Barroso, Pablo GabrielIn this work we present the first conclusions obtained from the morphotectonic and seismotectonic analysis of the Benis Cave (Cieza, SE of Spain). Both analyses provide new descriptions of seismic structures formed during a known instrumental earthquake and a new type of paleoseismic feature or seismothem (a migrating coral flowstone). From the last seismothem, at least two paleoearthquakes have been identified within the cave. During the Mula earthquake (mb = 4.8, MSK VII, 1999), a massive collapse of metric blocks at -156m was reported. This direct effect caused by a low magnitude earthquake shows the high sensitivity of caves to seismic shaking in this area.Item Present-day strain field on the South American slab underneath the Sandwich Plate (Southern Atlantic Ocean): A kinematic model(Special publication - Geological Society of London, 2009) Giner Robles, Jorge Luis; Pérez López, Raúl; Rodríguez Pascua, Miguel Angel; Martínez Díaz, José Jesús; González Casado, J.M.This work analyses the present-day principal strain orientation on the downgoing slab of the South America Plate (SAM) beneath the Sandwich Plate (SAND). The strain regime was deduced from the study of 331 earthquake focal mechanism solutions examined by fault population analysis methods. In the slab, the maximum horizontal shortening direction (ey) rotates in trend in a clockwise direction from NE in the north, to SE in the south. Based on this rotation, three different areas were defined according to the prevailing focal mechanism type: (1) the North Zone, with ey oriented N058°E and reverse and strike-slip focal mechanisms; (2) the Central Zone, with only reverse focal mechanisms and ey striking N080°E; and (3) the South Zone, with ey oriented N1068E and reverse and strike-slip focal mechanisms. The strain field in the North Zone of the SAND involves decoupling of the slab at approximately 70 km depth. In contrast, the South Zone edge slab exhibits no decoupling and it exhibits different geometry (hook-like shaped) from the North Zone. Finally, we define the dextral strike-slip component acting at the South Sandwich Fracture Zone (SSFZ), according to focal mechanism solutions and the regional tectonic configuration.Item The 7 June 2007 mbLg 4.2 escopete earthquake : An event with significant ground motion in a stable zone (Central Iberian Peninsula)(Seismological research letters, 2008) Carreño, Emilio; Benito, B.; Martínez Solares, José Manuel; Cabañas, Luis; Giner Robles, Jorge Luis; Murphy, P.; López, C.; Del Fresno, Carmen; Alcalde, J.M.; Gaspar Escribano, Jorge M.; Antón, R.; Martínez Díaz, José Jesús; Cesca, Simone; Izquierdo, A.; Sánchez Cabañero, J.G.; Expósito, P.An earthquake occurred on 7 June 2007 at 01h:42m:09.5s (UTC) with geographical coordinates 40°.41N, 2°.98W and magnitude mbLg = 4.2 according to the Seismic national network (RSN) of Madrid's Instituto Geográfico Nacional (IGN). The epicenter was located close to the town of Escopete, where the earthquake was felt with intensity IV, waking up inhabitants and causing widespread alarm. Historically, rare but similar events have been felt in the area, near the towns of Pastrana (1922) and Duron (1982). Nevertheless, this part of Iberia experiences very low seismic activity. The earthquake with the largest magnitude recorded to date by the RSN since the mid-1920s was 4.1. Due to low seismicity values, the hazard map of the Norma de la Construcción Sismorresistente Española (Spanish seismic building code; NCSE-02) establishes a basic acceleration value of less than 0.04 g, which is the threshold value for the application of the earthquake-resistant building code. However, this value was exceeded in strong-motion recordings during the 2007 event. An important consideration is the existence of two nuclear power plants in the Guadalajara administrative province: José Cabrera and Trillo. Strong-motion instruments at the José Cabrera nuclear power plant (JCNPP) recorded a peak ground acceleration (PGA) value of 0.07g. This is the first acceleration recording made from central Iberia and also one of the highest values read from instruments to date for the whole of the Iberian peninsula. This paper presents an overview of the results of our multidisciplinary analysis of the earthquake, which we researched in terms of its regional and local tectonic setting, local seismicity, focal mechanics, strong-motion records, and macroseismic effects.Item 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 ManuelEn 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.Item Criterios geomorfológicos sobre actividad tectónica reciente a lo largo de la Costa Recta, Isla Decepción (Antártida Occidental)(Geotemas, 2004) Pérez-López, R.; Fernández-Ibáñez, F.; Martínez Díaz, José Jesús; Paredes, C.; Giner Robles, Jorge Luis; Caselli, A.Several active tectonic evidences are observed along Costa Recta, located eastward of Deception Island (western Antarctica): marine terraces and fluvial streams cutting a relict glacier. The height of both landforms decrease southward from Macaroni Point, appointing to a tilt movement across a fault plane. Fault planes were measured at Macaroni Point and Baily Head, with a main NNWSSE orientation, similar to the Costa Recta strike. From several scales o f measure, the orientation of the beach was established in two principal segments: N168QE, and N173QE. On the other hand, the beach and glacier dynamics and sedimentary deposits were studied. According to the morpho-tectonic analysis, we conclude that the Costa Recta beach is a retreat scarp of a submarine fault oriented NNW-SSE and located in the Bransfield Strait, although a geophysical study o f the marine bottom is needed to map the fault trace in an accurate way.Item Descomposición fractal en subdominios morfotectónicos del mapa de lineamientos morfológicos en la isla Decepción (Shetland del Sur, Antártida)(Boletín geológico y minero, 2007) Paredes, C.; Vega, R. de la; Pérez-López, R.; Giner Robles, Jorge Luis; Martínez Díaz, José JesúsLa isla Decepción (Archipiélago de las Shetland del Sur, Antártida) es una de las áreas sismo-volcánicas más activas de la Antártida. El último y reciente período eruptivo en 1967, 1969, 1970, y la elevada frecuencia de los terremotos de baja magnitud así lo evidencian. La isla se encuentra en un marco geodinámico complejo que establece SO-NE y NNO-SSE como direcciones de control tectónico más relevantes; sin embargo, se desconoce como afecta la compleja organización geométrica de las redes de fracturas y fallas en la distribución del volcanismo y la sismicidad en la isla. Para estudiar tal efecto, en este trabajo se confecciona una cartografía 1:25.000 de los lineamientos morfológicos sobre la isla, a partir de una síntesis bibliográfica, del análisis morfométrico del relieve y del procesado de imágenes aéreas, que ulteriormente es validada mediante comparación con un modelo de fracturación de la isla. Con el objeto de encontrar una estructura en los patrones de lineamientos sobre este mapa se ha analizado si se comporta con características fractales en agregación y ocurrencia. La agregación de lineamientos ha sido caracterizada según un modelo de Levy-Lee de exponente D, detectándose tres comportamientos en la distribución azimutal de la dimensión fractal: D<1,5, D≈1,5, y D>1,5, que diferencian seis sectores sobre la isla. La ocupación espacial de las fracturas ha sido caracterizada mediante la estimación de la dimensión fractal de recubrimiento Do, lo que ha permitido distinguir las áreas en las que éstos tienden a distribuirse uniformemente (mayores valores de Do≈1,62 en el NE de la isla) de las que lo hacen limitadamente (valores más bajos de Do≈1,39 en la zona SW). La evaluación conjunta de disposición geográfica de las zonas con características fractales de agregación y ocurrencia semejantes ha permitido establecer una subdivisión en zonas en las que la morfología de los patrones de los lineamientos morfotectónicos se comporta de forma semejante. La comparación de esta zonificación con la tipología del volcanismo y/o actividad reciente acontecida en su interior permite establecer una posible relación entre el tipo de actividad volcánica y la complejidad del patrón en el que ocurre.Item The Quaternary Active Faults Database of Iberia (QAFI v.2.0)(Journal of iberian geology, 2012) García Mayordomo, Julián; Insua Arévalo, Juan Miguel; Martínez Díaz, José Jesús; Jiménez Díaz, Alberto; Martín Banda, Raquel; Martín Alfageme, Santiago; Álvarez Gómez, José Antonio; Rodríguez Peces, Martín Jesús; Pérez López, Raúl; Rodríguez Pascua, Miguel Angel; Masana Closa, Eulàlia; Perea, Héctor; Martín González, Fidel; Giner Robles, Jorge Luis; Cabral, JoaoThe Quaternary Active Faults Database of Iberia (QAFI) is an initiative lead by the Institute of Geology and Mines of Spain (IGME) for building a public repository of scientific data regarding faults having documented activity during the last 2.59 Ma (Quaternary). QAFI also addresses a need to transfer geologic knowledge to practitioners of seismic hazard and risk in Iberia by identifying and characterizing seismogenic fault-sources. QAFI is populated by the information freely provided by more than 40 Earth science researchers, storing to date a total of 262 records. In this article we describe the development and evolution of the database, as well as its internal architecture. Additionally, a first global analysis of the data is provided with a special focus on length and slip-rate fault parameters. Finally, the database completeness and the internal consistency of the data are discussed. Even though QAFI v.2.0 is the most current resource for calculating fault-related seismic hazard in Iberia, the database is still incomplete and requires further review.Item 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 ManuelEste 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).Item Speleoseismology and palaeoseismicity of Benis Cave (Murcia, SE Spain): coseismic effects of the 1999 Mula earthquake (mb 4.8)(Geological Society Special Publication, 2009) Pérez López, Raúl; Rodríguez-Pascua, M.A.; Giner Robles, Jorge Luis; Martínez Díaz, José Jesús; Marcos Nuez, A.; Silva Barroso, Pablo Gabriel; Bejar Pizarro, Marta; Calvo Sorando, José PedroThis work describes the coseismic ceiling block collapse within Benis Cave (−213 m; Murcia, SE Spain), associated with the 1999 Mula earthquake (mb=4.8, MSK VII). The collapse occurred at −156 m into the Earthquake Hall, and as a consequence one small gallery became blind. We studied the geology, topography and active tectonic structures relevant to the cave. In addition, we carried out a seismotectonic analysis of the focal mechanism solutions, and also a fault population analysis on slickensides measured in fault planes in the cave. The stress and strain regime is interpreted as being congruent with the palaeoseismic evidence, and agrees with the fault kinematics established for cave galleries developed within fault planes and growth anomalies of coral flowstone. Our analysis suggests that one active segment (NNE–SSW) determined the morphology and topography of the Benis Cave, where strong to moderate palaeoearthquakes (6≤M≤7) took place. As a consequence of this intense seismic activity a small gallery collapsed. A new palaeoseismic structure, or seismothem, has been recognized, namely the effect of palaeoearthquakes affecting the pattern of development of the spatial coral flowstone distribution located at the bottom of the cave.