Crustal motion and strain accumulation in western Bulgaria

Kotzev, V.; Nakov, R.; Georgiev, Ts. B.; Burchfiel, B. C.; King, Robert W.

doi:10.1016/j.tecto.2005.10.040

Cited by 66 publications

(44 citation statements)

References 18 publications

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“…All segments develop an E-W strike and they form a right stepping fault geometry covered by an alluvial plain. Mountrakis et al (2006) suggest that the alluvial plain obscures the main fault trace revealing a rather small slip rate for the fault zone, a fact that is in agreement with the geodetic data of Kotzev et al (2006). Along the fault trace outcrops of travertines, springs and fault breccia fanglomerates are found.…”

Section: Geological and Seismotectonic Settingsupporting

confidence: 81%

“…Kotzev et al (2006) after geodetic survey in order to determine kinematics in south and western Bulgaria reconfirms the -325-previous researcher and present more robust evidence that the region consists the northern boundary of the extensional Aegean domain. They found a mean extensional velocity of 1-2 mm/yr or less with an uncertainty near or below 0.5 mm/yr.…”

Section: Long-term Slip Rate Constraints On the Major Faultssupporting

confidence: 81%

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The Evolution of the Stress Field in Eastern Macedonia and Thrace

et al. 2018

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Section: Geological and Seismotectonic Settingsupporting

confidence: 81%

Section: Long-term Slip Rate Constraints On the Major Faultssupporting

confidence: 81%

The Evolution of the Stress Field in Eastern Macedonia and Thrace

et al. 2018

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“…Karakostas et al (2006) found that a fault with a mean strike = 300°, dip = 62°, rake = -65°is the most suitable to reproduce the observed deformation field when comparing modeled displacements with those obtained from geodetic measurements by Yankov (1945). These fault parameters are in agreement with both surface ruptures and the orientation of the axis of maximum extension in the area (Kotzev et al 2006) resulting to a left-lateral strike slip component added to the normal faulting. In order to assign a more detailed geometry we considered two segments for the source approximation differing in strike.…”

Section: Gorna Oriahovitsa Earthquakesupporting

confidence: 78%

“…The fault plane solutions of the respective main shocks are also shown by the faults. The long-term slip rates on them were taken equal to 1 mm/year following the above-mentioned relevant results and more recent work of Kotzev et al (2006). Information on the fault location and geometry is given in Table 1.…”

Section: Seismotectonic Settingmentioning

confidence: 99%

Static stress changes associated with normal faulting earthquakes in South Balkan area

Papadimitriou

Karakostas

Τρανός

et al. 2006

Int J Earth Sci (Geol Rundsch)

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Activation of major faults in Bulgaria and northern Greece presents significant seismic hazard because of their proximity to populated centers. The long recurrence intervals, of the order of several hundred years as suggested by previous investigations, imply that the twentieth century activation along the southern boundary of the sub-Balkan graben system, is probably associated with stress transfer among neighbouring faults or fault segments. Fault interaction is investigated through elastic stress transfer among strong main shocks (M ‡ 6.0), and in three cases their foreshocks, which ruptured distinct or adjacent normal fault segments. We compute stress perturbations caused by earthquake dislocations in a homogeneous half-space. The stress change calculations were performed for faults of strike, dip, and rake appropriate to the strong events. We explore the interaction between normal faults in the study area by resolving changes of Coulomb failure function (DCFF) since 1904 and hence the evolution of the stress field in the area during the last 100 years. Coulomb stress changes were calculated assuming that earthquakes can be modeled as static dislocations in an elastic half-space, and taking into account both the coseismic slip in strong earthquakes and the slow tectonic stress buildup associated with major fault segments. We evaluate if these stress changes brought a given strong earthquake closer to, or sent it farther from, failure. Our modeling results show that the generation of each strong event enhanced the Coulomb stress on along-strike neighbors and reduced the stress on parallel normal faults. We extend the stress calculations up to present and provide an assessment for future seismic hazard by identifying possible sites of impending strong earthquakes.

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“…A c. 20 mm∕y rightlateral strike-slip motion along the North Anatolian Fault Zone (NAFZ) and 9 mm∕y left-lateral motion along the East Anatolian Fault (EAF) accommodate the westward escape of Anatolia. The GPS velocity field from a dataset I compiled from several sources (3,(11)(12)(13)(14)(15)(16)(17) and four IGS stations (GPSVELv1.0) (18) with respect to GSRM-APM-1, an Absolute Plate Motion (APM) reference frame (19), is given in Fig. 1.…”

mentioning

confidence: 99%

Crust-mantle mechanical coupling in Eastern Mediterranean and Eastern Turkey

Özeren

2012

Proc. Natl. Acad. Sci. U.S.A.

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Present-day crust-mantle coupling in the Eastern Mediterranean and eastern Turkey is studied using the Global Positioning System (GPS) and seismic anisotropy data. The general trend of the shear wave fast-splitting directions in NE Turkey and Lesser Caucaus align well with the geodetic velocities in an absolute plate motion frame of reference pointing to an effective coupling in this part of the region of weak surface deformation. Farther south, underneath the Bitlis Suture, however, there are significant Pn delays with E-W anisotropy axes indicating significant lateral escape. Meanwhile, the GPS reveals very little surface deformation. This mismatch possibly suggests a decoupling along the suture. In the Aegean, the shear wave anisotropy and the Pn anisotropy directions agree with the extensional component of the right-lateral shear strains except under the Crete Basin and other parts of the southern Aegean Sea. This extensional direction matches perfectly also with the southward pulling force vectors across the Hellenic trench; however, the maximum right-lateral shear directions obtained from the GPS data in the Aegean do not match either of these anisotropies. Seismic anisotropy from Rayleigh waves sampled at 15 s, corresponding to the lower crust, match the maximum right-lateral maximum shear directions from the GPS indicating decoupling between the crust and the mantle. This decoupling most likely results from the lateral variations of the gravitational potential energies and the slab-pull forces.

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Crustal motion and strain accumulation in western Bulgaria

Cited by 66 publications

References 18 publications

The Evolution of the Stress Field in Eastern Macedonia and Thrace

The Evolution of the Stress Field in Eastern Macedonia and Thrace

Static stress changes associated with normal faulting earthquakes in South Balkan area

Crust-mantle mechanical coupling in Eastern Mediterranean and Eastern Turkey

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