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Characterizing the seismic potential of the Eastern Betic Shear Zone (EBSZ), a major source of earthquakes in Southeastern Iberia

Authors: Masana, E.; Gràcia, Eulàlia; Moreno, Ximena; Bartolomé, Rafael; Dañobeitia, Juan José;

Characterizing the seismic potential of the Eastern Betic Shear Zone (EBSZ), a major source of earthquakes in Southeastern Iberia

Abstract

[ES] La sismicidad en el sureste de la Península Ibérica se encuentra repartida en una amplia franja. Esto, junto con la baja velocidad de convergencia tectónica (4-5,6 mm/a) sugiere la existencia de fallas sismogenéticas no detectadas, con baja velocidad de deformación y distribuidas ampliamente. Algunas de ellas han producido terremotos históricos catastróficos pero posiblemente gran parte está por detectar ya que su periodo de recurrencia puede ser muy largo. En esta comunicación presentamos una síntesis de los resultados de los estudios paleosísmicos realizados en diferentes fallas de la Zona de Cizalla de las Béticas Orientales (ZCBO). Con ellos se han detectado fallas sismogenéticas (fallas de Carboneras, Alhama de Murcia y Bajo Segura) y se ha caracterizado su potencial sísmico (valor máximo de recurrencia entre 10 y 20 ka y Magnitud máxima Mw 7). Para ello se usaron técnicas paleosismologicas aunque, dada la baja velocidad de las fallas y la penetración de algunas fallas en mar, se realizó un esfuerzo para incorporar otras técnicas como geofísica de alta resolución o métodos de datación como 10Be y OSL en feldespatos potásicos. Los primeros resultados GPS de la zona se integraron también en el estudio

[EN] The southeastern Iberian Peninsula shows a wide distribution of seismicity, which together with the very slow plate convergence rate (4-5,6mm/yr) suggests, the presence of a number of hidden seismogenic faults widespread and slow-moving. Few of these faults have produced catastrophic historical earthquakes and the rest have remained silent historically owing to their very long recurrence periods. In this study we present a synthesis of the paleoseismic studies performed along different faults of the Eastern Betic Shear Zone that allowed us to detect seismogenic faults (Carboneras, Alhama de Murcia and Bajo Segura faults) and characterize their seismic potential (recurrence periods between 10 and 20 ka and likely maximum magnitudes of Mw7). We used a paleoseismic approach, but given the slow moving nature of these faults and the onshore-offshore trace of some faults we had to add other techniques such as high-resolution geophysics or alternative dating techniques (10Be or OSL in Kfelspars). GPS values are also integrated in the study

Masana, E. ... et al.-- Inciativa Ibérica para el Estudio de las Fallas Activas (IBERFAULT), Primera Reunión Ibérica sobre Fallas Activas y Paleosismología - Primeira Reunião Ibérica sobre Falhas Activas e Paleossismologia - First Iberian Meeting on Active Faults and Paleoseismology, 27-29 de Octubre de 2010, Sigüenza, Guadalajara, España.-- 4 pages, 1 figure

This work was founded by the Spanish Ministerio de Educación y Ciencia through the EVENT project (CGL2006-12861-C02-01/BTE) and was also supported by the Consolider-Ingenio 2010 programme, under CSD2006-0004 "Topo-Iberia"

Peer Reviewed

Keywords

ZCBO, Seismogenic faults, Fallas sismogenéticas, Fallas de rumbo, Seismic parameters, Slow-moving faults, Parámetros sísmicos, Strike-slip faults, EBSZ, Fallas lentas

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This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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