<p>This thesis uses various approaches such as observation of satellite images, field investigations, analogue modeling and GPS measurements to constrain deformation of the basement and sedimentary cover of the Zagros fold-thrust belt in time and space.</p><p>Focal mechanism solutions of most earthquakes indicate that deformation in the Zagros basement is due to shortening and thickening through numerous thrust faults. However, observations of strike-slip faulting recognized on satellite images imply that N-S trending faults in the Zagros, inherited from Pan-African basement, rotated about vertical axes to accommodate the convergence between Arabia and central Iran.</p><p>Field studies suggest that southwestward advance of the Zagros front has been recorded by syn-sedimentary structures. These structures indicate that deformation started as early as end Eocene in the northeast of the Simply Folded Zone and propagated progressively to the southwest. The deformation front drove the foreland basin to its present position along the Persian Gulf and Mesopotamia. </p><p>Scaled analogue models suggest that the seismicity due to orogenic shortening depends largely on the friction between the cover and its basement. Models show that fold-thrust belts with low tapers shortened above low friction ductile decollements involve several long-lived thrust faults generating low to moderate earthquakes over wide areas at the same time. By contrast, earthquakes with larger magnitudes are expected to occur along a few short-lived thrust ramps in fold-thrust belts with larger tapers shortened above high-friction decollments.</p><p>GPS-derived velocities across and along the Zagros suggest that only about one third (10 ± 3 mm/yr) of the current convergence between Arabia and Eurasia is accommodated within the Zagros by thickening to the east of the Kazerun Fault and thickening and lateral movement to the west. The remaining (21 ± 3 mm/yr) is transferred beyond the Zagros suture to central Iran and the northern Iranian mountains.</p>

This thesis uses various approaches such as observation of satellite images, field investigations, analogue modeling and GPS measurements to constrain deformation of the basement and sedimentary cover of the Zagros fold-thrust belt in time and space. Focal mechanism solutions of most earthquakes indicate that deformation in the Zagros basement is due to shortening and thickening through numerous thrust faults. However, observations of strike-slip faulting recognized on satellite images imply that N-S trending faults in the Zagros, inherited from Pan-African basement, rotated about vertical axes to accommodate the convergence between Arabia and central Iran. Field studies suggest that southwestward advance of the Zagros front has been recorded by syn-sedimentary structures. These structures indicate that deformation started as early as end Eocene in the northeast of the Simply Folded Zone and propagated progressively to the southwest. The deformation front drove the foreland basin to its present position along the Persian Gulf and Mesopotamia. Scaled analogue models suggest that the seismicity due to orogenic shortening depends largely on the friction between the cover and its basement. Models show that fold-thrust belts with low tapers shortened above low friction ductile decollements involve several long-lived thrust faults generating low to moderate earthquakes over wide areas at the same time. By contrast, earthquakes with larger magnitudes are expected to occur along a few short-lived thrust ramps in fold-thrust belts with larger tapers shortened above high-friction decollments. GPS-derived velocities across and along the Zagros suggest that only about one third (10 ± 3 mm/yr) of the current convergence between Arabia and Eurasia is accommodated within the Zagros by thickening to the east of the Kazerun Fault and thickening and lateral movement to the west. The remaining (21 ± 3 mm/yr) is transferred beyond the Zagros suture to central Iran and the northern Iranian mountains.

Ancêtre du rebec médiéval, emblème de la musique arabo-andalouse ou encore instrument favori des bédouins arabes pour l’accompagnement de leurs récits et de leurs poèmes, le rebab, sous ses différentes variantes joue encore plusieurs fonctions et rôles qui diffèrent d’un peuple à l’autre et d’une région à une autre. Cette thèse a pour but l’étude approfondie des rebabs de l’Afrique du nord et du Moyen-Orient. Chaque variante de cet instrument est étudiée sur plus d’un plan : historique, organologique, musical et même acoustique. La classification et la muséologie de cet instrument, avec ses différentes variantes, sont aussi abordées dans ce travail. L’intérêt de cette thèse, réside dans l’étude approfondie des différents types de cet instrument, ainsi qu’aux liens existants entre eux, car nous pensons qu’aujourd’hui, tout comme pour le sujet du ‘ūd ou tout autre instrument, il faudrait avoir une approche scientifique globale sur le sujet du rebab. / Ancestor of the medieval rebec, the emblem of the Arab-Andalusian music or the favorite instrument of the Arabics Bedouins for the accompaniment of their narratives and their poems, the rebab, under its various variants, still plays several roles and functions which differ from each people and each region. This thesis aims at the in-depth study of the rebabs of North Africa and the Middle East. Every variant of this instrument is studied on more than a plan: history, organology, musical and even acoustic. The classification and the museology of this instrument, with its various variants, are also approached on this work. The interest of this thesis, lives in the in-depth study of the various types of this instrument, as well as in the existing links between them, because we think that today, as for the 'ud or any other instrument, it would be necessary to have a global scientific approach about the rebab.