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Inversion of moment tensor focal mechanisms for active stresses around the Microcontinent Iberia: Tectonic implications

Vicente Muñoz, Gerardo de and Cloetingh, Sierd and Muñoz Martín, Alfonso and Olaiz Campos, Antonio José and Stich, Daniel and Vegas, Ramón and Galindo-Zaldívar, Jesus and Fernández Lozano, Javier (2008) Inversion of moment tensor focal mechanisms for active stresses around the Microcontinent Iberia: Tectonic implications. Tectonics, 27 (TC1009). pp. 1-22. ISSN 0278-7407

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Abstract

The Iberian microcontinent and its connected oceanic crust are affected by deformations related to the Eurasian-African plate boundary. Active stress inversions from populations of moment tensor focal mechanisms have been performed around and inside the Iberian peninsula, using a total of 213 moment tensor estimates. Main results are: 1) The tensorial solutions show better consistency and lower misfits compared to those obtained previously from first P arrival focal mechanisms. 2) Along the Eurasia- Africa western boundary, the type of active stresses progressively changes easternwards from triaxial extension to uniaxial compression along the Terceira Ridge, the Gloria Fault zone and the Gulf of Cadiz. 3) In the Betics-Alboran-Rif zone, uniaxial extension predominates with Shmax N155ºE trending. 4) In N Algeria, uniaxial compression reappears. 5) The Iberian foreland is currently under strike-slip to uniaxial extension tensorial conditions.


Item Type:Article
Uncontrolled Keywords:Active Tectonics, Seismicity, Iberia
Subjects:Sciences > Geology > Seismology
Sciences > Geology > Geodynamics
ID Code:7646
Deposited On:18 Feb 2008
Last Modified:06 Feb 2014 07:55

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