Sismotectonique et socle tardi-hercynien réactivé au Sud-Est de la France .
Résumé
In the Provencal basement, a prefaulted late Hercynian system, hidden beneath the Meso-Cenozoic cover, is evidenced from seismic distribution and analysis of focal mechanisms. This system extends roughly in a N40° to N50° direction from the Durance fault betwen the Argentera and Pelvoux Massifs. It is composed of senestrial strike-slip faults with a small inverse component which is more important in the South-western part of the zone in front of the Digne nappe. The lateral extrusion of a block which is delimited to the North with the Belledonne-Mont Blanc dextral fault and to the South with our senestrial strike-slip faults system is consistent with the dextral strike-slip system which follows the bend of the external western border of the Alpine belt. It also agrees with the geodynamical model at present admitted for the Alps namely a post-collision regime limited to the end of the convergence of Apulian and African plates with a likely conterclockwise rotation of the Adriatic plate. Finaly the lateral extrusion of the block may be responsible for the ondulation of the basement and the derived overlaps of the Lure Moutain.
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