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Recent intraplate stress field in the eastern Duero Basin (N Spain)
Author(s) -
Jorge Cortés,
Maestro
Publication year - 1998
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1046/j.1365-3121.1998.00203.x
Subject(s) - intraplate earthquake , geology , stress field , rift , tectonics , seismology , extensional definition , structural basin , stress (linguistics) , paleontology , linguistics , philosophy , physics , finite element method , thermodynamics
Palaeostresses inferred from brittle mesostructures in the eastern Duero Basin show a recent stress field characterized by an extensional regime, with local strike‐slip and compressional stress states. Orientations of the maximum horizontal stress ( S Hmax ) show a relative scattering with two main modes: NNE to NE–SW and NW–SE. These orientations suggest the existence of two stress sources responsible for the dominant directions of the maximum horizontal stress in northeastern Iberia. Extensional structures within a broad‐scale compressional stress field can be related to both the decrease in relative stress magnitudes from active margins to intraplate regions and rifting proccesses ocurring in eastern Iberia. Stress states with NW–SE‐trending S Hmax are compatible with the dominant pattern established for western Europe. NE–SW orientations of S Hmax suggest the occurrence of tectonic forces coming from the Pyrenean zone. Geological and geophysical data indicate the existence of both orientations from the upper Miocene to the present‐day in NE Iberia.