Seismic reflection data in the Umbria Marche Region: limits and capabilities to unravel the subsurface structure in a seismically active area

摘要

Before seismic data were made available, the subsurface setting of the Umbria-Marche area was mainly derivedfrom the extrapolation of surface data and from models resulting from analogies with other mountain chainsaround the world. During the ‘90s industrial seismic data availability considerably increased, allowing the definitionof new, previously unknown features. Beside the industrial seismic data availability, a deep crustal, nearvertical seismic section trending E-W was acquired (CROP-03) across the Italian peninsula from the Tyrrhenianto the Adriatic coast. The subsurface data defined the compressional deformation style (thin- Vs thick- skinned)and the extensional deformation style. A set of east-dipping low-angle-normal faults, which dissect the previouscompressional structures and which are the dominant features controlling the extension of the Apennines wererecognised. The subsequent application of the seismic data interpretation to seismotectonic issues, defined inmore detail the subsurface geometries of the active faults and the relationships between upper crust structure andseismicity.