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.
Highlights
The Umbria-Marche region comprises the Umbria-Marche Apennines, an arc-shaped fold-and-thrust belt, verging towards ENE, and the Umbria pre-Apennines (Bally et al, 1986), west of the Umbria-Marche Apennines where Miocene turbidites crop out,.The Umbria-Marche Apennines are a mountain belt formed by two main groups ofThe schematic stratigraphy of the region is composed of: i) Pale-F
Before subsurface data were available, both the compressional and extensional deformation styles resulted from extrapolation at depth of surface data and from analogies with other parts of the world
The main innovations brought by the seismic lines and boreholes can be summarised as follows: The deformation style of the UmbriaMarche region is characterised by a thickskinned tectonics in which the upper part of the basement is involved in the compressional structures which form the Umbria-Marche Apennines
Summary
The Umbria-Marche region comprises the Umbria-Marche Apennines, an arc-shaped fold-and-thrust belt, verging towards ENE, and the Umbria pre-Apennines (Bally et al, 1986), west of the Umbria-Marche Apennines (fig. 1a) where Miocene turbidites crop out, (see Barchi et al, 2001 for a recent review). Ozoic to Middle Triassic basement rocks; ii) Late Triassic evaporites (alternated anhydrites and dolomites - Anidriti di Burano fm, Martinis and Pieri, 1964); iii) a carbonatic multilayer (lower-Lias - early Oligocene) composed of carbonatic platform limestones (Calcare Massiccio fm) beneath basinal limestones and a preturbiditic sequence (early Oligocene-early Miocene) made of marly limestones; iv) a Miocene turbiditic sequence (Marnoso Arenacea fm, west of the Inner Ridge) made of sandstones and marls Both the basement and the Anidriti di Burano fm never crop out in the belt and they were drilled by deep boreholes in the past years (Anelli et al, 1994) where the Anidriti di Burano were found to have a thickness of about 2 km. We will review and discuss the results of the interpretation of a grid of seismic sections (Barchi et al, 1999; Pauselli et al, 2002; Mirabella et al, 2004; Mirabella et al, 2008) (fig. 3a) and their contribution to the reconstruction of the subsurface geology, which provides independent information on: i) the style of deformation characterizing the compressional and extensional tectonics and their geometry and kinematics and ii) the rocks occurring at seismogenic depth
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