GPS results for Macedonia and its importance for the tectonics of the Southern Balkan extensional regime

Burchfiel, B. C.; King, Robert W.; Todosov, Angel; Kotzev, V.; Durmurdzanov, Nikola; Serafimovski, Todor; Nurçe, Bilbil

doi:10.1016/j.tecto.2005.10.046

Cited by 53 publications

(30 citation statements)

References 12 publications

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“…At its western end, segment A runs to the north of the regions of extension and convergence in Greece. Although there is some active deformation to the north of this line, velocities there are generally lower than 2–3 mm/yr relative to Eurasia [ Burchfiel et al , ; Kotzev et al , ].…”

Section: Physical Modelmentioning

confidence: 99%

Constraints from GPS measurements on the dynamics of deformation in Anatolia and the Aegean

2016

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We estimate the strength of the lithosphere in Anatolia and the Aegean, and the boundary forces acting upon it, using a dynamical model that treats the lithosphere as a thin fluid sheet deforming in response to variations in gravitational potential energy. This model has one free material parameter, the power law exponent, n, of the vertically averaged rheology of the lithosphere, and two parameters that specify the forces per unit length applied to its edges. Solutions to this model that best fit the velocities of 346 reliable GPS sites require an effective viscosity of the lithosphere of 1022 to 1021 Pa s at strain rates of 10 to 100 nanostrain per year. The best‐fitting force at the Arabia‐Anatolia boundary is consistent with the lithostatic pressure due to the high topography there, and the force at the Nubia‐Aegean boundary is consistent with the contrast in lithostatic pressure across that boundary. No additional force, from “slab rollback” or basal tractions due to convection in the mantle, is required to explain the observations. These results are supported by scaling relations derived from approximate analytical solutions. The inverse relationship between the viscosity of the lithosphere and deviatoric stress produces strong slowly deforming regions in the Southern Aegean and Central Anatolia whose motions resemble those of microplates. The distribution of geodetic strain rates within the region, and the partitioning between normal and strike‐slip faulting, are explained by the interplay between boundary conditions, internal variations in gravitational potential energy, and the power law rheology of the lithosphere.

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Section: Physical Modelmentioning

confidence: 99%

Constraints from GPS measurements on the dynamics of deformation in Anatolia and the Aegean

2016

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“…Northeastern Aegean Sea is affected by dextral active strike‐slip related to the NAF (∼25 mm/yr [ McClusky et al , 2000]). In the Balkan Peninsula, geodetic data suggest small but still active N‐S extension [ Burchfiel et al , 2006], emphasized by historic seismic activity in Bulgaria revealed by morphotectonic and paleoseismic studies [ Meyer et al , 2007]. High seismic activity and transpression on the active Kefalonia Fault is well documented [ Louvari et al , 1999].…”

Section: Tectonic Settingsmentioning

confidence: 99%

“…Previous kinematic and geodynamic works have focused either on Central or Eastern Mediterranean, and little effort has been made to produce a self‐consistent kinematic solution that simultaneously fits Calabria and Hellenic geodetic data as well as onshore and offshore constraints. Deformation in the Balkans [ Burchfiel et al , 2006; Kotzev et al , 2006], emphasized by recent GPS studies [ Jouanne et al , 2012; K. Matev et al, Horizontal movements and strain rates obtained from GPS observations for the period 1996–2008 in southwest Bulgaria and northern Greece, manuscript in preparation, 2012] (Figure 2), has not always been considered, while fragmentation of the Nubian plate [ D'Agostino et al , 2008] is generally neglected.…”

Section: Introductionmentioning

confidence: 99%

Bridging onshore and offshore present‐day kinematics of central and eastern Mediterranean: Implications for crustal dynamics and mantle flow

Pérouse

Chamot‐Rooke

Rabaute

et al. 2012

Geochem Geophys Geosyst

108

104

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[1] We present a new kinematic and strain model of an area encompassing the Calabrian and Hellenic subduction zones, western Anatolia and the Balkans. Using Haines and Holt's (1993) method, we derive continuous velocity and strain rate fields by interpolating geodetic velocities, including recent GPS data in the Balkans. Relative motion between stable Eurasia and the western Aegean Sea is gradually accommodated by distributed N-S extension from Southern Balkans to the Eastern Corinth Gulf, so that the westward propagation of the North Anatolian Fault (NAF) throughout continental Greece or Peloponnesus is not required. We thus propose that the NAF terminates in north Aegean and that N-S extension localized in the Corinth Gulf and distributed in Southern Balkans is due to the retreat of the Hellenic slab. The motion of the Hyblean plateau, Apulia Peninsula, south Adriatic Sea, Ionian Basin and Sirte plain can be minimized by a single rigid rotation around a pole located in the Sirte plain, compatible with the opening the Pelagian rifts (2-2.5 mm/yr) and seismotectonics in Libya. We interpret the trenchward ultraslow motion of the Calabrian arc (2-2.5 mm/yr) as pure collapse, the Calabrian subduction being now inactive. In the absolute plate motion reference frame, our modeled velocity field depicts two toroïdal crustal patterns located at both ends of the Hellenic subduction zone, clockwise in NW Greece and counter-clockwise in western Anatolia. We suggest the NW Greece toroïdal pattern is the surface expression of a slab tear and consequent toroïdal asthenospheric flow.

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“…This lead to the reactivation of inherited faults and subsequently pull apart-like opening of the Ohrid Basin (Dumurdzanov et al 2005;Ilic and Neubauer, 2005). After Burchfiel et al (2006), the recent transition zone (today located in Central Albania) between extensional and the compressional regime is evidently marked by right-lateral strike-slip, which can be identified from displacement vectors derived from GPS measurements and geological data. Concerning the westward migration of the deformation domains as explained in Chap.…”

Section: Tectonic Historymentioning

confidence: 99%

Evolution of ancient Lake Ohrid: a tectonic perspective

et al. 2010

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Abstract. Lake Ohrid Basin is a graben structure situated in the Dinarides at the border of the Former Yugoslavian Republic of Macedonia (FYROM) and Albania. It hosts one of the oldest lakes in Europe and is characterized by a basin and range-like geological setting together with the halfgraben basins of Korca, Erseka and Debar. The basin is surrounded by Paleozoic metamorphics in the northeast and north and Mesozoic ultramafic, carbonatic and magmatic rocks in the east, northwest, west and south. Paleocene to Pliocene units are present in the southwest. With the basin development,

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GPS results for Macedonia and its importance for the tectonics of the Southern Balkan extensional regime

Cited by 53 publications

References 12 publications

Constraints from GPS measurements on the dynamics of deformation in Anatolia and the Aegean

Constraints from GPS measurements on the dynamics of deformation in Anatolia and the Aegean

Bridging onshore and offshore present‐day kinematics of central and eastern Mediterranean: Implications for crustal dynamics and mantle flow

Evolution of ancient Lake Ohrid: a tectonic perspective

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