Recent seismogenic fault activity in a Late Quaternary closed-lake graben basin (Albacete, SE Spain)



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Rodríguez Pascua, Miguel Angel and Pérez López, Raúl and Calvo Sorando, José Pedro and García del Cura, M. Ángeles (2008) Recent seismogenic fault activity in a Late Quaternary closed-lake graben basin (Albacete, SE Spain). Geomorphology, 102 . pp. 169-178. ISSN 0169-555X

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The Cordovilla basin, located within the frontal thrust belt of the Betic Cordillera, SE Spain, is an elongated NW–SE graben showing discrete surface rupture generated by Holocene paleoearthquake activity. A main and an antithetic normal, NW–SE trending, active faults bound the basin. Paleoseismological evidence is reported on upslope-facing scarps of the antithetic fault, acting as dams to runoff, which contributed to temporary lacustrine conditions, as well as sediment uplift. The fluvial network in the area shows a poor drainage activity, whereas a present lake is dammed by the antithetic fault. The modern landscape is controlled by Holocene faulting, modifying the geological environment according to arthquake occurrence, from flat alluvial plains to lacustrine local basins. The application of the diffusion dating technique to unconsolidated sediments for the antithetic fault scarp indicates an age between 1 and 2 ka. Various geometric parameters have been obtained in order to reconstruct the paleoseismic history of the Cordovilla graben basin. The surface rupture and fault-offset values are associated with discrete active morpholineaments, parallel to the Pozohondo Fault. The Tobarra–Cordovilla segment (the structural boundary of the Cordovilla Basin) was generated by earthquakes with magnitudes (Mw) greater than 6.0, based on Wells and Coppersmith fault scarp relations.

Item Type:Article
Uncontrolled Keywords:Active fault, Graben basin, Diffusion equation, Paleoearthquake, Holocene, SE Spain
Subjects:Sciences > Geology > Geodynamics
ID Code:58911
Deposited On:12 Feb 2020 12:49
Last Modified:12 Feb 2020 12:49

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