LATE-QUATERNARY TECTONICS ALONG THE PERI-ADRIATIC BELT OF CENTRAL ITALY: POSSIBLE EVIDENCE OF ACTIVE SHORTENING FROM TOPOGRAPHY, FLUVIAL NETWORK ANALYSIS, AND LANDSCAPE EVOLUTION
We investigated the possible existence of late Quaternary shortening also along the SAOF. Here, the foredeep deposits appear to seal former compressional structures; notwithstanding, the regressive depositional sequences are experiencing, since the Middle Pleistocene, a general phase of regional uplift. The latter is clearly recognizable in the deep fluvial network incision and in the conditioning of the landscape evolution of the existing piedimont surface.
We investigated the transient response that fluvial networks could exhibit as a consequence of folding and uplift, exploiting the favourable orientation of the streams with respect to the chain front. Knick-point detection over along-river longitudinal profiles, along with more advanced metrics, were compared with lithological and geological-structural features known for the area.
Geomorphic indices, in particular local relief and normalized channel steepness, are relatively high between the Pescara and Saccione rivers, suggesting locally higher rock uplift rates. In addition, interpretation of a seismic line crossing the northernmost sector of the investigated area shows a buried faulted anticline interesting the Pleistocene succession.
These perturbations on the fluvial network, suggest possible Late Quaternary active shortening along the SAOF.
This work has received funding from the European Research Council under the European Union’s Horizon 2020 Research and Innovation Programme (GA #795396)