and Mario Costa,

Chiara, Invernizzi

Chicco, Jessica Maria

Pietro Paolo Pierantoni,

English

Chicco, Jessica

Institutional Research Information System University of Turin

Geophysical Research AbstractsVol. 20, EGU2018-10525, 2018EGU General Assembly 2018© Author(s) 2018. CC Attribution 4.0 license.Buried high-angle structures in the Marche foothills area (Central Italy)Chiara Invernizzi (1), Pietro Paolo Pierantoni (1), Jessica Chicco (1,2), and Mario Costa (3)(1) University of Camerino, Schoolof Science and Technology, Geology Division, Via Gentile III da Varano 62032 Camerino(MC), Italy (chiara.invernizzi@unicam.it), (2) Department of Earth Sciences, University of Turin, Via Valperga Caluso 3510125 Torino, Italy, (3) Via Selvelli,6 61032 Fano (Italy)Some SW-NE seismic reflection profiles representing the central part of Umbria-Marche Apennine chain to theAdriatic sea, and kindly provided by ENI s.p.a., were interpreted. These profiles allowed to define the structuralsetting and main features at depth, and the evolution of the Marche Apennine sector with more details with respectto previous literature. Along three main parallel transects, crossing the Mio-Pliocene Apennine range and itsexternal Plio-Quaternary sector, we highlighted important sub-surface and deep-rooted (> 10Km) Plio-Quaternarystructures linked to outcropping ones. They are NW-SE or NNW-SSE oriented, with very steep geometry, and theyprobably involve the upper crust basement. In particular, these structures are interpreted as transpressive structuresrelated to lower depth SW and NE-dipping high-angle reverse faults and up-thrusts (positive flower structures).These latter structures involve the Pliocene-Quaternary succession at surface. Moving from W to E, three ofthese main sub-surface positive structures have been identified in the Marche foothills. Ultimately, deep-rootedhigh-angle structures determine a predominat upwards and along striking tectonic transport and they can alsohave possible relationships with deep fluid circulation. The innermost structure nucleated starting from LowerPliocene, the easternmost ones from Upper Pliocene, confirming a NE migration of the deformation. Furthermore,NE-dipping normal and transtensive faults are present west to the compressive structures and with their sameage; they can be interpreted as accomodation structures, similar to that found in the Po Plain underground (Costa,2003). The recognized structures are well framed within the general context where thrust activity in centralApennine almost ceased from upper Pliocene to Quaternary times, and recent focal mechanisms are mainlystrike slip (Mazzoli et al., 2015). The NNW-SSE or NW-SE orientated deep rooting sub-vertical structures canbe interpreted as the conjugate fault system with respect to the ENE-WSW or NE-SW seismogenic faults in theAdriatic, although they are probably active at different times, and they reactivate inherited discontinuities.References:COSTA M., (2003) The buried, Apenninic arcs of the Po Plain and northern Adriatic Sea (Italy): a new model .Boll. Soc. Geol. It. Vol. 122, fasc. 1, 3 – 23MAZZOLI S., SANTINI S., MACCHIAVELLI C., ASCIONE A. (2015) Active tectonics of the outer northernApennine: Adriatic vs Po Plin seismicity and stress fields. Journ. of Geodynamics 84, 62-76.

Buried high-angle structures in the Marche foothills area (Central Italy).

https://iris.unito.it/bitstream/2318/1704220/1/EGU2018-10525.pdf

Buried high-angle structures in the Marche foothills area (Central Italy).

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