Possible Location of the Next Major Earthquakes in the Northern Apennines: Present Key Role of the Romagna-Marche-Umbria Wedge

Mantovani, Enzo; Viti, Marcello; Babbucci, Daniele; Tamburelli, Caterina; Cenni, Nicola

doi:10.4236/ijg.2017.811075

Cited by 6 publications

(3 citation statements)

References 41 publications

(17 reference statements)

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“…This can be attributed to the influence of pre-existing features inherited by previous deformation phases such as the faults shown in Figure 9. These structures are compatible with the main local shortening oriented in an NNE-SSW direction during the Middle-Late Pliocene (compression with the P axis about NNE-SSW; Figure 12), which emerged in the northern sector of the Marche region [24,67,68] and, more generally, in the overall Central Adriatic area [69,70].…”

Section: Discussionsupporting

confidence: 76%

Plio–Quaternary Structural Evolution of the Outer Sector of the Marche Apennines South of the Conero Promontory, Italy

Costa¹,

Chicco

Invernizzi

et al. 2021

Geosciences

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Some new results and preliminary remarks about the Plio–Quaternary structural and evolutionary characteristics of the outer Marche Apennines south in the Conero promontory are presented in this study. The present analysis is based on several subsurface seismic reflection profiles and well data, kindly provided by ENI S.p.A. and available on the VIDEPI list, together with surface geologic–stratigraphic knowledge of Plio–Quaternary evolution from the literature. Examples of negative vs. positive reactivation of inherited structures in fold and thrust belts are highlighted. Here, we present an example from the external domain of the Marche Apennines, which displays interesting reactivation examples from the subsurface geology explored. The study area shows significant evolutionary differences with respect to the northern sector of the Marche region previously investigated by the same research group. The areal distribution of the main structures changes north and south of the ENE–WSW oriented discontinuity close to the Conero promontory. Based on the old tripartite classification of the Pliocene, the results of this work suggest a strong differential subsidence with extension occurring during the Early Pliocene and principal compressive deformation starting from the Middle Pliocene and decreasing or ceasing during the Quaternary. The main structure in this area is the NNW–SSE Coastal Structure, which is composed of E-vergent shallow thrusts and high-angle deep-seated normal faults underneath. An important right-lateral strike–slip component along this feature is also suggested, which is compatible with the principal NNE–SSW shortening direction. As mentioned, the area is largely characterized by tectonic inversion. Starting from Middle Pliocene, most of the Early Pliocene normal faults became E-vergent thrusts.

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Section: Discussionsupporting

confidence: 76%

Plio–Quaternary Structural Evolution of the Outer Sector of the Marche Apennines South of the Conero Promontory, Italy

Costa¹,

Chicco

Invernizzi

et al. 2021

Geosciences

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“…In a number of papers, we argued that the short-term effects of the Apennine tectonic pattern described in this note are compatible with the spatio-temporal distribution of major earthquakes in the last centuries (Mantovani et al, 2010(Mantovani et al, , 2015b(Mantovani et al, , 2017Viti et al, 2012Viti et al, , 2013.…”

Section: Western Adria Boundary (Apennines)mentioning

confidence: 60%

How and why the present tectonic setting in the Apennine belt has developed

Mantovani

Viti

Babbucci

et al. 2019

JGS

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The building of the Apennine belt slowed down or ceased around the Early Pleistocene. Since then, the belt has undergone strong uplift and considerable distortion. Such drastic change, from beltnormal to belt-parallel shortening, has been determined by the fact that the continental Adriatic domain (Adria) was almost completely surrounded by buoyant orogenic structures. In that context, the mobility of Adria underwent a considerable reduction, while uplift and deformation of its southern part was strongly emphasized as an effect of the convergence of the confining plates. Around the middle Pleistocene, the deformation pattern in the periAdriatic zones changed again, in response to the acceleration of Adria. In the Apennines, the outer (Adriatic) sector of the chain underwent belt parallel shortening, accommodated by uplift and outward escape of upper crustal wedges. The separation between the extruding wedges and the almost stable inner belt has generated a series of extensional /transtensional fault systems along the axial part of the Apennines, that now correspond to the main seismogenetic sources. The main tectonic reorganizations in the study area are supposed to have been controlled by the least-action principle.The Apennine chain (Fig. 1) built up during the Miocene and Pliocene as an effect of the subduction of the Adriatic domain beneath the migrating advancing Alpine belt (e.g.

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“…The occurrence of several major earthquakes in the Romagna Apennines reveals the presence of an important roughly S-N fault system (Rom in Figure 2, [44] and references therein, [42,45]). This discontinuity allows the RMU wedge to decouple from the Tuscany-Emilia Apennines sector that is not parallel to the Adria plate.…”

Section: Introductionmentioning

confidence: 99%

Tectonics and Seismicity in the periAdriatic Zones: Implications for Seismic Hazard in Italy

Mantovani¹,

Tamburelli²,

Babbucci³

et al. 2021

Earthquakes - From Tectonics to Buildings

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The recognition of the seismic zones most prone to next major earthquakes in Italy would considerably help the choice of the most efficient prevention plan. This work describes an attempt to gain reliable information about that problem by exploiting the knowledge about the short-term development of the ongoing tectonic processes in the study area and its influence on the spatio-temporal distribution of major shocks. In the periAdriatic zones, such distribution is connected with the progressive northward displacement of the Adria plate, that is controlled by the progressive activation of the decoupling fault systems in the surrounding belts (Dinarides, Apennines and Eastern Southern Alps). The reliability of this hypothesis is evaluated by analysing the seismic histories of the periAdriatic zones. The regularity patterns that are tentatively recognised in such histories are used to identify the most probable location of next major shocks. Further insights into the present seismic hazard in the Southern Apennines and Calabria are tentatively inferred from tectonic connections between these regions and other periAdriatic zones, suggested by the seismic histories in the last 2–4 centuries and the geodynamic/tectonic context in the central Mediterranean area.

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Possible Location of the Next Major Earthquakes in the Northern Apennines: Present Key Role of the Romagna-Marche-Umbria Wedge

Cited by 6 publications

References 41 publications

Plio–Quaternary Structural Evolution of the Outer Sector of the Marche Apennines South of the Conero Promontory, Italy

Plio–Quaternary Structural Evolution of the Outer Sector of the Marche Apennines South of the Conero Promontory, Italy

How and why the present tectonic setting in the Apennine belt has developed

Tectonics and Seismicity in the periAdriatic Zones: Implications for Seismic Hazard in Italy

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