Deformation Pattern in the Western North Aegean Trough: Preliminary Results

Sakellariou, D.; Rousakis, G.; Vougioukalakis, Georges; Ioakim, Chryssanthi; Morfis, Ioannis; Zimianitis, E.; Athanasoulis, K.; Tsampouraki-Kraounaki, Konstantina; Mpardis, D.

doi:10.12681/bgsg.11708

Cited by 13 publications

(16 citation statements)

References 13 publications

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“…1b). It is generally accepted, that extensional and strike-slip faulting is superposed in the basin, and that recent strikeslip activity is probably related to the propagation of the NAF into the Sporades Basin (Roussos and Lyssimachou, 1991;Hatzfeld et al, 1999;Beniest et al, 2016;Sakellariou et al, 2016;Ferentinos et al, 2018). The interpretation of current dextral movement in the Sporades Basin is further evidenced by dextral earthquake focal mechanism solutions (Fig.…”

Section: Introductionmentioning

confidence: 93%

“…In contrast, the continuation of the NAF in the Aegean displays distributed, transtensional style of deformation, possibly related to the interaction of the propagating dextral NAF with the pre-existing extensional stress field and fault pattern of the Aegean region (Armijo et al, 1996;McNeill et al, 2004;Philippon et al, 2014;Sakellariou et al, 2016;Ferentinos et al, 2018). The Aegean extension is related to trench retreat since ca.…”

Section: Introductionmentioning

confidence: 97%

“…The North Aegean Trough (NAT, Fig. 1b) in the northern Aegean Sea is a key region for investigating the interplay between back-arc extension and strike-slip faulting, related to the combined effects of the Hellenic slab-rollback and the westward extrusion of Anatolia (Le Pichon et al, 1981;Lybéris, 1984;Mascle and Martin, 1990;Philippon et al, 2014;Beniest et al, 2016;Sakellariou et al, 2016;Ferentinos et al, 2018). The latter has been accommodated by a major continental transform fault, the North Anatolian Fault (NAF, Fig.…”

Section: Introductionmentioning

confidence: 99%

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Post-5 Ma rock deformation on Alonnisos (Greece) constrains the propagation of the North Anatolian Fault

Porkoláb

Willingshofer

Sokoutis

et al. 2022

Preprint

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<p>The localization of the North Anatolian Fault in the northern Aegean Sea (North Aegean Trough) is an intriguing example of continental transform fault propagation. Understanding this process critically depends on quantifying the amount of strike-slip displacement and the superposition of normal and strike-slip faulting in the region, which is the aim of this study. In particular, we unravel and quantify normal and dextral faulting along the Alonnisos fault system, at the south-western margin of the North Aegean Trough (Sporades Basin), in order to constrain the spatial and temporal evolution of the basin and the North Anatolian Fault. We present detailed structural data collected from Messinian strata of Alonnisos to infer the amount of tilting and shortening and to constrain normal and dextral faulting along the Alonnisos fault system through simple analytical half-space models of dislocations. The Messinian rocks of Alonnisos record significant tilting and gentle folding close to the termination zone of the main fault segment. The tilting of the Messinian rocks implies footwall uplift in the order of 6-7 km (vertical displacement) during normal faulting on the boundary fault system, which lead to post 5 Ma substantial deepening of the Sporades Basin. The post-Messinian folding accommodated ~ 1 km shortening at the footwall termination zone of the Alonnisos fault, which implies a dextral slip of 3-4 km. Our results support the models of currently distributed dextral strain in the North Aegean in response to the propagation of the North Anatolian Fault. However, similarities with the evolution of the Sea of Marmara might suggest that dextral shear could yet become fully localized in the NAT in the next few Myrs.</p>

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Post-5 Ma rock deformation on Alonnisos (Greece) constrains the propagation of the North Anatolian Fault

Porkoláb

Willingshofer

Sokoutis

et al. 2022

Preprint

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“…Северо-Анатолийский мегалинеамент восток-северо-восточного направления широко известен в качестве западного сегмента Северо-Анатолийской разломной зоны (W NAFZ). Он включает две параллельные ветви: собственно Северо-Анатолийскую (Скирос-Эдремит-Бурса-Болу-Бафра) ( и Северо-Эгейскую (Северо-Эгейский трог (NAT)-трог Сарос-разломная зона Ганос-система разломов и пул-апарт-грабенов Мраморного моря) Sakellariou et al, 2016;. В сейсмотектоническом отношении зона мегалинеамента является весьма активной с правосдвиговой транстенсивной кинематикой движений Kilias et al, 2008).…”

Section: линеаменты северо-восточных румбовunclassified

Tectonolinament framework of the Black Sea region and the surrounding areas

Pokalyuk

Lomakin

Verkhovtsev

et al. 2021

UJRS

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Modern high-precision global digital 3-d models of the relief of the continents and the ocean floor (SRTM, GEBCO) are the objective basis to clarify the structure and features of the organization of the planetary fault network of of the Black Sea region and adjacent areas of the Mediterranean mobile belt and surrounding platform areas, to find out the location of the main transregional supermegalineaments forming the deep structural-tectonic framework of the territory. A complete consistency of the structural plan of faults and fault zones within the sea areas and continental surroundings is established. The structural position of the Black Sea basin as a whole is determined by its location at the intersection area (superposition, interference) of the diagonal (subdiagonal) transcontinental tectonolinament belts: the north-west – Elba-Zagros, Caucasus-Kopetdag, and the north-east – Atlas- Black Sea. The absence of large-scale lateral displacements at the intersection nodes of differently oriented supermegalineament systems indicates the relative autonomous stationarity and inheritance of the formation of the lyneament framework during the entire Mezozoic-Cenozoic and relatively low-shear nature of its implementation. This feature of the Black Sea region structural pattern significantly limits the possibility of using neomobilistic geodynamic models to explain the history of the geological development of the region. The strict consistency and orderliness of the lineament framework can be ensured only by global planetary factors associated with the influence of the rotational regime of the Earth's shells on the stress distribution in the lithosphere.

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“…Figure1. The major lithospheric-scale tectonic structures of the broader Aegean (afterBarka and Kadinsky-Cade, 1988;Lallemant et al, 1994;Poulos et al, 1999;Şengör et al, 2005;Makris and Papoulia, 2012;Özbakır et al, 2013;Sakellariou et al, 2016). Abbreviations: AACZ = Apulia-Aegean Collision Zone, CTFZ = Cephalonia Transfer Fault Zone, CG = Corinth Gulf, NAF = North Anatolian Fault, NAT = North Aegean Trough, NAB = North Aegean Basin, CAT = Central Aegean Trough.…”

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confidence: 99%

Recent earthquake activity of March 2021 in northern Thessaly unlocks new scepticism on Faults

Pavlides¹

2021

Turkish J Earth Sci

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This short opinion article presents and highlights new and old problems related to active geological faults, as seismic sources, after the experience of the last March 3 and 4, 2021 (M w 6.3 and M w 6.0, respectively) Tyrnavos-Elassona earthquakes in northern Thessaly, Greece. Although the active faults in the area are very well studied, demonstrating typical geomorphic features that intensely affect the morphological relief, it seems that the earthquakes were produced by unknown faults emerging in the mountainous area (alpine basement). Primary (?) coseismic ruptures, however, were also observed northwards along the Titarissios valley. A geological interpretation of the faulting mechanism is also proposed. The existence of a new unknown source in an intermontane area is problematic. The role of inherited alpine structures seems more important today than in the past. The strike of the two new seismogenic sources, responsible for the two strongest events of the 2021 earthquake succession, differs from the previously known active faults. This forces us to reconsider older views on the direction of development of active faults and the orientation of the stress field. Concerns are being raised about how new structures can be detected and their role in seismic hazard assessment, especially when located near or within the urban fabric, in cities that are now constantly expanding and being established in new, often loose soils.

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Deformation Pattern in the Western North Aegean Trough: Preliminary Results

Cited by 13 publications

References 13 publications

Post-5 Ma rock deformation on Alonnisos (Greece) constrains the propagation of the North Anatolian Fault

Post-5 Ma rock deformation on Alonnisos (Greece) constrains the propagation of the North Anatolian Fault

Tectonolinament framework of the Black Sea region and the surrounding areas

Recent earthquake activity of March 2021 in northern Thessaly unlocks new scepticism on Faults

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