This work investigates the structural style and recent to active deformation in the external area of the Northern Apennines adjoining the Po Plain, using data from seismic reflection profiles and well logs from on- and offshore locations along the Adriatic coast. ENI S.p.A. kindly provided most of the seismic profiles, while others were developed by the public ViDEPI Project. In particular, the Project prepared four NE-SW sub-parallel transects on the basis of detailed interpretation of the available sub-surface data, supported with surface geological data. Through analysis of the well logs, the Project identified two significant seismo-statigraphic markers, together with some unconformities within the Middle Pliocene/Quaternary succession. This study proposes a detailed structural scheme for the area, which identifies and interprets outcropping and buried Apennine structures. NW/NNW-SE/SSE high angle transpressive or flower structures, referred to recent and actual deformation history can be responsible for surface and low-depth features, with possible implications for active tectonics. The continuity of some of these structures toward the Conero area to the south is shown, suggesting a wider and more regional meaning for the tectonic style proposed in this study. Furthermore, in the northern offshore part of the area, these Apenninic structures close against the active NNE-SSW Cattolica fault system, forming an asymmetric arch. This study brings new contributions to the interpretation of the deformation style of the outer northern Apennine.

Supplementary material:https://doi.org/10.6084/m9.figshare.c.4497542

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