Person: Rodríguez Peces, Martín Jesús
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First Name
Martín Jesús
Last Name
Rodríguez Peces
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Geodinámica, Estratigrafía y Paleontología
Area
Geodinámica Interna
Identifiers
6 results
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Now showing 1 - 6 of 6
Item Could the Granada fault produce a catastrophic earthquake?(2009) Azañón, J.M.; García Mayordomo, Julián; Insua Arévalo, Juan Miguel; Rodríguez Peces, Martín JesúsThe City of Granada is placed at the margin of a flat area known as the Granada Basin (Betic Cordillera, SE Spain) surrounded by mountains. The seismic activity in the Granada Basin is high, with a large number of earthquakes, all of them of moderate to low magnitude (Mb≤5.5). Historically, earthquakes in this area have produced important material damage and human casualties; however, it is hard to evaluate their magnitude. Seismicity has its origin mostly at depths between 5 and 17 km and the focal mechanisms indicate a present stress field dominated by a tensional tensor with an associated NE-SW extensional axis. The sedimentary cover of the Granada Basin is mostly coeval with the activity of faults that bound the basin, which have controlled the stratigraphic architecture. These faults are normal, mostly with a NW-SE orientation, and dipping towards the SW. Basinwards migration of the extensional front has exhumed the footwalls of older faults, uplifting the previous Tortonian sedimentary cover, which presently outcrops as emerged ranges at the margins of the basin. This work presents preliminary results of a paleoseismic study of the Granada Fault, an NW-SE active normal fault that produces a Plio-Quaternary throw of 300 m. According to these data, slip rate has been estimated in 0.38 mm/y (Sanz de Galdeano et al., 2003). Several palaeosoils, Pleistocene in age, have been affected by this fault. Three different events can be recognized from the accumulative throw. The vertical slip per event ranges from 5 to 7 cm. Following the empirical relationship between moment magnitude and average displacement proposed by Wells and Coppersmith (1994), a magnitude between 5.9 and 6.0 can be preliminary assessed for these events. The palaeosoils were sampled and dated using the Thermoluminiscence method to constrain these estimates.Item Estimación de la localización y la magnitud de terremotos pre-instrumentales a partir de análisis retrospectivos de inestabilidades de ladera: el caso del deslizamiento de Güevéjar (Granada)(2011) Rodríguez Peces, Martín Jesús; García Mayordomo, Julián; Azañón, J.M.; Insua Arévalo, Juan Miguel; Jiménez Pintor, J.El estudio de detalle de inestabilidades de ladera provocadas por terremotos representa una nueva herramienta para la estimación de la localización epicentral y la magnitud de eventos sísmicos pre-instrumentales. En este trabajo se reconstruye las condiciones previas al terremoto del deslizamiento de Güevéjar, localizado en la Cuenca de Granada. Esta gran inestabilidad de ladera se reactivó durante los terremotos de Lisboa en 1755 y de Arenas del Rey en 1884. Para cada caso se ha calculado la aceleración sísmica mínima necesaria para desencadenar la inestabilidad y, a partir de este dato, se ha inferido la localización epicentral y la magnitud más probables para cada evento sísmico. Los resultados sugieren que la magnitud momento del terremoto de Lisboa en 1755 fue de al menos 8.5 y que se localizó a 580 km del deslizamiento. Para el terremoto de Arenas del Rey en 1884, se obtuvo que su magnitud momento fue de al menos 6.5 y que se localizó en los primeros 55 km alrededor del deslizamiento. En este caso, se confirma que la Falla de Ventas de Zafarraya pudo ser la fuente sismogénica de este evento sísmico. [ABSTRACT]Slope stability back-analysis performed for earthquake-triggered landslides provides additional constraints on the size and location of pre-instrumental seismic events. In this paper we reconstruct the pre-earthquake conditions of a major landslide located in the Granada Basin –the Güevéjar landslide, which was triggered twice by the 1755 Lisbon and 1884 Arenas del Rey earthquakes. For each case the minimum seismic acceleration needed to trigger the instability has been calculated, and from this datum the most likely magnitude and epicentral location has been inferred for each event. Our results suggest that the moment magnitude of the 1755 Lisbon earthquake was at least 8.5 and that it was located as far as 580 km from the landslide. For the 1884 Arenas del Rey earthquake we conclude that its moment magnitude was at least 6.5 and that it was located within the first 55 km around Güevéjar. These results support the Ventas de Zafarraya Fault as the seismogenic source of the event.Item Comparación del método de Newmark a escala regional, local y de emplazamiento en las cuencas de Lorca y de Granada (SE España)(2009) Rodríguez Peces, Martín Jesús; García Mayordomo, Julián; Azañón, J.M.; Insua Arévalo, Juan Miguel; Pérez García, José Luis; Delgado, JorgeEn este trabajo presentamos un estudio de inestabilidades de ladera inducidas por terremotos a escala regional, local y de emplazamiento en las cuencas de Lorca y de Granada. Para las escalas regional y local hemos aplicado el método del “bloque rígido deslizante” de Newmark mediante un sistema de información geográfica (SIG), mientras que para la escala del emplazamiento se han realizado estudios de detalle empleando programas de equilibrio límite. Hemos seleccionado tres casos: los desprendimientos rocosos relacionados con las recientes series sísmicas de Bullas 2002 (mbLg=4.8) y La Paca 2005 (mbLg=4.7) en la Cuenca de Lorca (Murcia) y el deslizamiento de Güevéjar relacionado con el terremoto histórico de Arenas del Rey 1884 (IMSK=X) en la Cuenca de Granada. Finalmente, hemos comparado los valores de factor de seguridad, aceleración crítica y desplazamiento de Newmark obtenidos a diferentes escalas con objeto de mejorar la calibración del método de Newmark a escala regional.Item Contribuciones recientes de la geología al análisis de la peligrosidad sísmica en España(2011) García Mayordomo, Julián; Insua Arévalo, Juan Miguel; Jiménez Díaz, Alberto; Álvarez Gómez, José Antonio; Rodríguez Peces, Martín JesúsRecientemente se han producido en España una serie de iniciativas encaminadas a aprovechar el conocimiento geológico para la definición y la caracterización de fuentes sismogénicas enfocadas al cálculo de la peligrosidad sísmica en Iberia. En esta comunicación se expone el contexto internacional en el que han tenido lugar estas iniciativas así como los principales logros alcanzados: la Base de Datos de Fallas Activas en el Cuaternario de Iberia (QAFDBI) y el Modelo Integrado de Zonas Sismogénicas de Iberia. [ABSTRACT]Recently a number of initiatives have been carried out in Spain with the aim of making the best out of the geological knowledge for defining and characterizing seismogenic sources for seismic hazard calculations in Iberia. In this communication we present the international context in which these initiatives have taken place, as well as their main achievements: the Quaternary Active Faults Database of Iberia (QAFDBI) and the Integrated Model of Seismogenic Source Zones of Iberia.Item Palaeoseismological features of the Granada fault(2009) Azañón, J.M.; García Mayordomo, Julián; Insua Arévalo, Juan Miguel; Rodríguez Peces, Martín JesúsThis paper presents preliminary results of a palaeoseismic study of the Granada Fault, a NW‐SE active normal fault that produces a Plio‐Quaternary throw of 300 m. According to these data, slip rate has been estimated in 0.38 mm/y (Sanz de Galdeano et al., 2003). Several palaeosols, Pleistocene in age, have been affected by this fault. Three different events can be recognized from the accumulative throw. The vertical slip per event ranges from 5 to 7 cm. Following the empirical relationship between moment magnitude and average displacement proposed by Wells and Coppersmith (1994), a magnitude between 5.9 and 6.0 can be preliminary assessed for these events. The palaeosols were sampled and dated using the thermoluminiscence method to constrain these estimates.Item Preliminary results of static and dynamic reconstruction of Güevéjar landslide (Granada, Spain) during 1755 Lisbon and 1884 Andalusian earthquakes(2009) Rodríguez Peces, Martín Jesús; García Mayordomo, Julián; Azañón, J.M.; Insua Arévalo, Juan Miguel; Jiménez Pintor, J.In this work, we present preliminary results of a reconstruction of the Güevéjar landslide (Granada, south Spain) during the 1755 Lisbon and 1884 Andalusian earthquakes. We perform a back‐analysis of the landslide to estimate the static safety factor and the critical acceleration previous to both earthquakes and for the present‐day situation. We obtain a critical intensity of V which matches the minimum intensity grade required to trigger coherent landslides. We conclude that the Güevéjar landslide is stable at present‐day conditions but its reactivation is expected in case of an earthquake with a similar intensity to that during the 1884 Andalusian earthquake (I=VI‐VII) or larger.