EGU2020-9569
https://doi.org/10.5194/egusphere-egu2020-9569
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

3D reconstructions of fault surfaces and key stratigraphic horizons to define recent tectonic activity in the northern Apennines outer fronts and foredeep (northern Adriatic Sea, Italy)

Yuri Panara1,4, Francesco Emanuele Maesano2, Roberto Basili2, Giacomo Losi1, Jakub Fedorik3, and Giovanni Toscani1,4
Yuri Panara et al.
  • 1University of Pavia
  • 2Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
  • 3King Abdullah University of Science and Technology (KAUST)
  • 4CRUST (Centro inteRUniversitario per l’analisi SismoTettonica tridimensionale con applicazioni territoriali), Pavia 27100, Italy

Fault plane attitude and dimension are important parameters for deriving seismotectonic information or input data for earthquake hazard assessment and in this sense a complete 3D view and characterization of geological and structural elements is essential. However, there is always a trade-off between structural complexity and data availability at the scale of the designed application.

In the last few years, merging public and confidential seismic reflection profiles and borehole data, were used in order to carry out a 3D reconstruction of fault planes and Plio-Pleistocene stratigraphic horizons in the northern Adriatic Sea, at the front of the northern Apennine fold-and-thrust belt and associated foredeep. The study area straddles the Italian coastline and subsurface data interpretation allowed us to reconstruct the structural setting of both onshore and offshore structures. Although it is known that this area has low rates of active tectonic deformation, it hosts important seismogenic faults associated with instrumental seismicity and historical earthquakes.

The dense distribution of seismic reflection profiles allowed us to perform an accurate 3D reconstruction of almost 50 fault planes, of different dimensions and order of importance. Their geometrical and structural features helped to define the most recent tectonic phases. To this end, we also mapped several Plio-Pleistocene regional unconformities and integrated them with previously published reconstructions of key horizons.

In some cases, where further published data were available, it was also possible to perform detailed cross sections whose restoration allowed us to reconstruct the post-Miocene (5.33 Ma) slip-rate history of some important tectonic structures with a detail of ~1 Ma. The 3D geological model revealed several structural features like fault continuity and terminations, level of connectivity, presence of lateral ramps, along strike variations of displacement that could not be fully addressed using cross sections alone.

How to cite: Panara, Y., Maesano, F. E., Basili, R., Losi, G., Fedorik, J., and Toscani, G.: 3D reconstructions of fault surfaces and key stratigraphic horizons to define recent tectonic activity in the northern Apennines outer fronts and foredeep (northern Adriatic Sea, Italy), EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-9569, https://doi.org/10.5194/egusphere-egu2020-9569, 2020