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

F. Mirabella, M. R. Barchi, A. Lupattelli

Abstract


Before seismic data were made available, the subsurface setting of the Umbria-Marche area was mainly derived
from the extrapolation of surface data and from models resulting from analogies with other mountain chains
around the world. During the 90s industrial seismic data availability considerably increased, allowing the definition
of new, previously unknown features. Beside the industrial seismic data availability, a deep crustal, near
vertical seismic section trending E-W was acquired (CROP-03) across the Italian peninsula from the Tyrrhenian
to 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 previous
compressional structures and which are the dominant features controlling the extension of the Apennines were
recognised. The subsequent application of the seismic data interpretation to seismotectonic issues, defined in
more detail the subsurface geometries of the active faults and the relationships between upper crust structure and
seismicity.

Keywords


seismic reflection data;upper crust structure;deformation style

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References


DOI: https://doi.org/10.4401/ag-3032
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X