Establishment of a Non-Permanent GPS Network to Monitor the Recent NE-SW Deformation in the Granada Basin (Betic Cordillera,Southern Spain) |
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| Authors: | Gil A J Rodríguez-Caderot G Lacy M C Ruiz A M Sanz de Galdeano C Alfaro P |
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| Institution: | (1) Dept. Ing. Cartográfica, Geodésica y Fotogrametría E.P.S., Universidad de Jaén, Virgen de la Cabeza 2, 2371 Jaén, Spain;(2) Dept. Astronomía y Geodesia, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain;(3) Facoltà di Ingegneria di Como, Instituto Politecnico di Milano, Via Valleggio 11, 22100 Como, Italy;(4) Instituto Andaluz de Ciencias de la Tierra, Facultad de Ciencias, 18071 Granada, Spain csanz@ugr.es;(5) Dept. Ciencias de la Tierra, Universidad de Alicante, San Vicente del Raspeig, Alicante, Spain |
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| Abstract: | The Granada Basin (Central Betic Cordillera), one of the most seismically active areas of the Iberian Peninsula, is currently subjected to NW-SE compression and NE-SW extension. The present day extension is accommodated by normal faults with various orientations but particularly with a NW-SE strike. At the surface, these active NW-SE normal faults are mainly concentrated on the NE part of the Basin. In this part we have selected a 15-km long segment where several active normal faults crop out. Using the marine Tortonian rocks as a reference, we have calculated a minimum extensional rate of 0.15-0.30 mm/year. The observed block rotation, the listric geometry of faults at depth and the distribution of seismicity over the whole Basin, indicate that this rate is a minimum value. In the framework of an interdisciplinary research project a non-permanent GPS-network has been established in the central sector of Betic Cordillera to monitor the crustal deformations. The first two observation campaigns were done in 1999 and 2000. |
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| Keywords: | active tectonics GPS network crustal deformation Betic Cordillera |
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