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

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Abstract

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 (ΔCFF) 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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Acknowledgments

The stress tensors were calculated using the DIS3D code of S. Dunbar, which later improved by Erikson (1986) and the expressions of G. Converse. The GMT system (Wessel and Smith 1998) was used to plot the figures. The paper has been greatly benefited by the revision of Martin Brady and an anonymous reviewer and the editorial assistance of Prof. Wolf-Christian Dullo. This study was supported by the bilateral research project between Greece and Bulgaria EPAN-M.4.3.6.1 and BG-9/05. Geophysics Department contribution 681.

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Papadimitriou, E., Karakostas, V., Tranos, M. et al. Static stress changes associated with normal faulting earthquakes in South Balkan area. Int J Earth Sci (Geol Rundsch) 96, 911–924 (2007). https://doi.org/10.1007/s00531-006-0139-x

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