ETUDE GEOPROSPECTIVE D'UN SITE DE STOCKAGE. VOLUME 7 - TECTONIQUE PROSPECTIVE - DUREE DES PHASES COMPRESSIVES ET DISTENSIVES RECENTES EVOLUTION DU CHAMP DE CONTRAINTES DANS LES 100.000 ANS
Within the Western European continental plate, since Mesozoic times, one sees the alternation or succession of convergent and divergent tectonic episodes. These tectonic episodes, although representing geologically discontinuous phenomena, still have time periods of between 4 to 40 million years. These tectonic phenomena are the cause of the formation or reactivation, at all scales in the continental plate, of brittle, fault-like structures. Tectonic analysis and the in situ measures of stress and the earthquake focal phenomena show that, from the lower Quaternary to the present, the Western European continental plate has been subjected to NNW to SSE convergent stress. A study of the arrangement of European and African plates in the Western Mediterranean shows that the entire region is undergoing a period of continental collision. The change in the process implies a westerly continental drift of the Spanish plate, a movement which would take several million years. On the Western European scale, the most likely hypothesis during the next 100,000 years is the persistence of the present stress trending approximately N-S. On the other hand, on a local scale, reorganisations of this stress are possible, owing to the presence of tectonic or lithological heterogeneities.
Bibliographic Reference: EUR 9866 FR (1985) MF, VOLUME 7, 73 P., BFR 150, BLOW-UP COPY BFR 365, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989126031901 / Last updated on: 1989-01-01
Available languages: fr