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Características de los tensores de esfuerzos activos entre la Dorsal Centroatlántica y la Península Ibérica.

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Vicente Muñoz, Gerardo de and Martín Velázquez, Silvia and Rodríguez Pascua, Miguel Angel and Muñoz Martín, Alfonso and Arcila, M. and Andeweg, Bernd (2000) Características de los tensores de esfuerzos activos entre la Dorsal Centroatlántica y la Península Ibérica. Geotemas, 1 (1). pp. 95-98. ISSN 1576-5172

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Abstract

The orientation of the principal stresses and the principal stress difference ratio has been determined along the southwestern boundary of the Euroasiatic plate with Northamerican and African plates by inversion method of focal mechanisms of earthquakes. The ridge push (30~ to 65Q N) ranges from E-W to ESE-WSW, with R values that show a triaxial extensional stress. The state of stress changes to strike-slip regime in the transform fault zones, and the Shmax strike turns clockwise to NW in the dextral strike-slip faults and counterclockwise to the NE in the sinistral ones. Along the margin between the Euroasiatic-African plates, from the Azores triple junction to Algeria, Shmax keeps a constant NW-SE strike but the stress ratio values range from triaxial extensional stress state, to the West, to uniaxial compresive stress state, to the East, passing through a strike-slip regime in the middle zone. In this context and with a widely NWSE Shmax, strike-slip and extensional stresses prevail in most Iberian peninsula, whereas southwards it is dominated by uniaxial compresive stresses.


Item Type:Article
Uncontrolled Keywords:Active stress tensors, Focal mecanisms of earthquakes, Inverse method, Euroasiatic plate, Iberian peninsula
Subjects:Sciences > Geology > Geodynamics
ID Code:61428
Deposited On:09 Jul 2020 10:53
Last Modified:09 Jul 2020 10:53

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