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The recent (upper Miocene to Quaternary) and present tectonic stress distributions in the Iberian Peninsula
Author(s) -
Herraiz M.,
De Vicente G.,
LindoÑaupari R.,
Giner J.,
Simón J. L.,
GonzálezCasado J. M.,
Vadillo O.,
RodríguezPascua M. A.,
Cicuéndez J. I.,
Casas A.,
Cabañas L.,
Rincón P.,
Cortés A. L.,
Ramírez M.,
Lucini M.
Publication year - 2000
Publication title -
tectonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.465
H-Index - 134
eISSN - 1944-9194
pISSN - 0278-7407
DOI - 10.1029/2000tc900006
Subject(s) - peninsula , geology , stress field , tectonics , structural basin , seismology , compression (physics) , fault (geology) , quaternary , population , stress (linguistics) , paleontology , focal mechanism , geography , archaeology , linguistics , philosophy , physics , materials science , demography , finite element method , sociology , composite material , thermodynamics
A general synthesis of the recent and present stress situation and evolution in the Iberian Peninsula was obtained from microstructural and seismological analysis. The stress evolution was deduced from (1) fault population analysis (FPA) from 409 sites distributed throughout the Iberian Peninsula, (2) paleostress indicators given by 324 stations taken from the bibliography, and (3) seismic data corresponding to 161 focal mechanisms evenly spread in the studied region. The application of FPA together with the determination of stress tensors and focal mechanisms for the whole Iberian microplate has provided two main results: (1) the Iberian Peninsula is undergoing a NW‐SE oriented compression, except for the northeastern part (Pyrenees, Ebro Basin, and Iberian Chain), where it is N‐S to NE‐SW, and the Gulf of Cádiz, where it seems to be E‐W, and (2) the main trends of the stress field have remained almost constant since the upper Miocene. The analysis performed by zones suggests the presence of local heterogeneities in the stress field.