Person:
Tsige Beyene, Meaza

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First Name
Meaza
Last Name
Tsige Beyene
URI
https://hdl.handle.net/20.500.14352/75198
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Geodinámica, Estratigrafía y Paleontología
Area
Geodinámica Interna
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End date: 1999 × Start date: 1996 ×

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    Actividad neotectónica de la Falla de Alentejo-Plasencia en Extremadura (Macizo Hespérico)
    (Actividad neotectónica de la Falla de Alentejo-Plasencia en Extremadura (Macizo Hespérico), 1996) Villamor Manero, Patricia; Capote Del Villar, Ramón; Tsige Beyene, Meaza; Sociedad Geológica de España
    Signs of recent tectonic activity are found at the Extremadura sector of Alentejo-Plasencia fault. This fault was active during the alpine compressional period as a sinistral strike-slip fault at the foreland of a collisional zone and presents sorne activity from the Miocene to the Quaternary. Upper «Raña» deposits of Early Villafranquian age, present an around-2-meter-vertical-displacement at the north border of Alburquerque granitic massif. Clase to this point old fluvial terraces of unknown age are folded and faulted, and low terraces (3 m above present river course) are jointed. In the tertiary Cañaveral pull-apart basin, at the Alcantara reservoir border, the fault disrupts a Tagus river fluvial terrace, which lies 80 m above the river course and has a probable Middle Pleistocene age. All these observations imply a vertical displacement which could be related to a slip rate less than 0.001 mm/year. lf this fault is compared with other active faults of the Hesperian Massif, such as the Bragança-Manteigas one, it becomes clear that Alentejo-Plasencia fault is less active. There are though paleoseismicity structures associated to the Alentejo-Plasencia fault, such as liquefaction features.