Geological Framework of PO Plain and Adriatic Foreland System

Fantoni, Roberto; Franciosi, R.

doi:10.3997/2214-4609.20147921

Cited by 6 publications

(5 citation statements)

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“…We interpret the sequence as a SE dipping volume that departs from the brittle surface imaged by previous seismicity, as the MT, at about 9 km depth; it breaks up potential off-fault patches, with antithetic geometry. We relate this cluster to the Montello backthrust, a tectonic structure first hypothesized by Fantoni and Franciosi (2008) based on the seismic interpretation of the CROP-Transalp profile, and confirmed by Picotti et al (2022). This feature has never been revealed by earthquakes before the Refrontolo sequence; thus the seismogenic source can be considered locked.…”

Section: Discussionsupporting

confidence: 84%

An unusually productive microearthquake sequence brings new insights to the buried active thrust system of Montello (Southeastern Alps, Northern Italy)

Peruzza

Romano²,

Guidarelli³

et al. 2022

Front. Earth Sci.

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In August 2021, an extremely productive seismic sequence took place in northeastern Italy. Within 1 month, we identified and localized 407 microearthquakes in the area monitored by the local Collalto Seismic Network. This is about 20 times the average monthly rate of events detected in the last decade; 92% of them are clustered near the village of Refrontolo at about 9 km depth (main event a ML2.5, MW2.4). None of the Refrontolo sequence earthquakes were felt by the population. The earthquakes, mostly identified by automatic procedures, were post-processed by manual picking of P, S-phases and polarities; they were localized by different techniques and define a small SE dipping volume that departs from the brittle surface previously enlightened by microseisms and assigned to the NNW dipping Montello Thrust. We interpret the sequence ruptured pre-stressed patches near to failure of sub-vertical, antithetically oriented faults. The unusual productivity rate and precursory foreshock activity support the hypothesis that the Montello system has a relevant aseismic component. We believe that this episode, of no importance from an energetic point of view, is of greatest interest for deciphering the seismic potential of this area and for strengthening automatic microearthquake detection and location procedures.

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Section: Discussionsupporting

confidence: 84%

An unusually productive microearthquake sequence brings new insights to the buried active thrust system of Montello (Southeastern Alps, Northern Italy)

Peruzza

Romano²,

Guidarelli³

et al. 2022

Front. Earth Sci.

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“…8 Geological transects across Adriatic sea (vertical exaggeration 2:1). Sections after Fantoni and Franciosi (2008) (5, 6 and 7); Bertotti et al (2001), eastward extension in Fantoni and Franciosi (2008) …”

Section: Cenozoic Compressionmentioning

confidence: 99%

“…Sections afterFantoni et al (2002b),Fantoni and Franciosi (2008) (1);Fantoni et al (2004),Fantoni and Franciosi (2008) (2);Fantoni and Franciosi (2008) (3);Barbieri et al (2004),Nicolich et al (2004),Castellarin et al (2006), southward extended and modified inFantoni and Franciosi (2008) (4)(Gozzano, Lugano, M. Cavallo and Trento;Fig. 6, Sects.…”

mentioning

confidence: 92%

Tectono-sedimentary setting of the Po Plain and Adriatic foreland

Fantoni

Franciosi

2010

Rend. Fis. Acc. Lincei

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Based on the substantial drilling and 2D/3D seismic control achieved during a 60-year-long hydrocarbon exploration history, a detailed reconstruction of the Adria plate foreland shared by the converging Southalpine, Dinaric/Albanian and Apennines chains is presented. Eight depth converted seismic transects joining the opposing belt margins and three time-scaled maps of the evolving tectono-sedimentary framework illustrate the shallow crustal geometry and evolution of the study area. Its Cenozoic compressional architecture results overprinted to and somewhere strongly controlled by the late Permian to early Cretaceous extensional features generated during the Mesozoic rift. The effects of the Cenozoic shortening affected the foreland at different times and with variable directions of tectonic deformation. The Dinaric and Albanian chain compression operated since Paleocene to, respectively, early Miocene and Pleistocene. The western and eastern Southalpine comparts acted on the area since early Oligocene to Messinian and middle Miocene to Pleistocene, respectively, whereas the Apennines system involved it since middle-late Miocene to Pleistocene. The result is a fragmented post-Eocene tectonic evolution of the Adriatic foreland controlled by both the diachronous chain segment activity and their coeval competition. The effect of the opposite chain segment interference was a multiple system of differently evolving foredeeps not exclusively ruled by the chain load at their back. Time and amount of the foreland flexuring were moreover accompanied by formation of transversal positive belts that played the role of transfer zones.

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“…11) across the Southern Alps and the Po Plain in the transect of Monte Orfano. The cross-section has been modified from Fantoni et al (2004), Fantoni and Franciosi (2008) and depth-extrapolated following the considerations about the Southern Alps thick-skinned tectonic style proposed in Picotti et al (1995Picotti et al ( , 1997 and Doglioni (2007). Our palinspastic restoration accounted for, in this order: the *5°southward Pliocene tilting of the Southern Alps due to the Pliocene Apennine flexuration, the out-of-sequence thrusting of the ''frontal anticline'' (''flessura pedemontana''), and the Burdigalian to Tortonian in-sequence outward thrusting (Schönborn 1992;Bersezio et al 1993;Picotti et al 1995Picotti et al , 1997.…”

Section: Tectonic Implicationsmentioning

confidence: 99%