Critères géomorphologiques de néotectonique verticale dans l'Apennin central adriatique

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Abstract
In the Mediterranean the general disposition of the main bulks of relief takes often the shape of broad ridges and swells; it is difficult to prove their quaternary uplift owing to the deep fluvial cutting of the landforms even if this cutting is due to the Neotectonics. This is the case with the Central Apennines which was superimposed from the Upper Pliocene upon the Apenninic folded belt, extended by fossilized folds under the Adriatic. The deformation of the Calabrian series certifies that the vertical Neotectonics is still alive, but it is not possible to measure it using some geomorphological criteria such as the study of an «envelope-surface» or the deformation or the analysis of the fluvial terraces. So we tried to find more available geomorphological data, based upon the research of remnants of piedmont forms and formations - very coarse breccia - arranged in stepped levels (Monte Acuto, Amandola, and, particularly, the Gran Sasso, at the foot of which the original Arapietra level is now uplifted to 1900 m). The number of continental quaternary levels which can be used to measure the uplift is enlarged up to 10 but there is some questions about the operating limitations of such a criterion. Key-words: Neotectonics, Piedmonts, Apennines.

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